Convert.ToInt64 Método
Definição
Importante
Algumas informações dizem respeito a um produto pré-lançado que pode ser substancialmente modificado antes de ser lançado. A Microsoft não faz garantias, de forma expressa ou implícita, em relação à informação aqui apresentada.
Converte um valor especificado num inteiro assinado de 64 bits.
Sobrecargas
| Name | Description |
|---|---|
| ToInt64(Single) |
Converte o valor do número de ponto flutuante de precisão simples especificado para um inteiro assinado equivalente de 64 bits. |
| ToInt64(String, Int32) |
Converte a representação da cadeia de um número numa base especificada para um inteiro com sinal equivalente de 64 bits. |
| ToInt64(String, IFormatProvider) |
Converte a representação de cadeia especificada de um número para um inteiro assinado equivalente de 64 bits, usando a informação de formatação específica da cultura. |
| ToInt64(Object, IFormatProvider) |
Converte o valor do objeto especificado para um inteiro assinado de 64 bits, usando a informação de formatação específica da cultura. |
| ToInt64(UInt64) |
Converte o valor do inteiro não assinado especificado de 64 bits para um inteiro com sinal equivalente de 64 bits. |
| ToInt64(UInt32) |
Converte o valor do inteiro não assinado especificado de 32 bits para um inteiro assinado equivalente de 64 bits. |
| ToInt64(UInt16) |
Converte o valor do inteiro não assinado especificado de 16 bits para o equivalente inteiro com sinal de 64 bits. |
| ToInt64(String) |
Converte a representação da cadeia especificada de um número num inteiro assinado equivalente de 64 bits. |
| ToInt64(SByte) |
Converte o valor do inteiro com sinal especificado de 8 bits para o equivalente inteiro com sinal de 64 bits. |
| ToInt64(Object) |
Converte o valor do objeto especificado para um inteiro assinado de 64 bits. |
| ToInt64(Int64) |
Devolve o inteiro com sinal especificado de 64 bits; não é realizada nenhuma conversão real. |
| ToInt64(Byte) |
Converte o valor do inteiro não assinado especificado de 8 bits para o equivalente inteiro com sinal de 64 bits. |
| ToInt64(Char) |
Converte o valor do carácter Unicode especificado para o inteiro assinado equivalente de 64 bits. |
| ToInt64(DateTime) |
Chamar este método gera sempre .InvalidCastException |
| ToInt64(Boolean) |
Converte o valor booleano especificado para o equivalente inteiro assinado de 64 bits. |
| ToInt64(Double) |
Converte o valor do número de ponto flutuante de dupla precisão especificado para um inteiro assinado equivalente de 64 bits. |
| ToInt64(Int16) |
Converte o valor do inteiro assinado especificado de 16 bits para um inteiro assinado equivalente de 64 bits. |
| ToInt64(Int32) |
Converte o valor do inteiro assinado especificado de 32 bits para um inteiro assinado equivalente de 64 bits. |
| ToInt64(Decimal) |
Converte o valor do número decimal especificado para um inteiro assinado equivalente de 64 bits. |
ToInt64(Single)
Converte o valor do número de ponto flutuante de precisão simples especificado para um inteiro assinado equivalente de 64 bits.
public:
static long ToInt64(float value);public static long ToInt64(float value);static member ToInt64 : single -> int64Public Shared Function ToInt64 (value As Single) As LongParâmetros
- value
- Single
O número de ponto flutuante de precisão simples a converter.
Devoluções
value, arredondado para o inteiro assinado de 64 bits mais próximo. Se value estiver a meio caminho entre dois números inteiros, o número par é devolvido; ou seja, 4,5 é convertido em 4, e 5,5 é convertido em 6.
Exceções
value é maior que Int64.MaxValue ou menor que Int64.MinValue.
Exemplos
O exemplo seguinte tenta converter cada elemento de um array de Single valores para um inteiro longo.
float[] values= { Single.MinValue, -1.38e10f, -1023.299f, -12.98f,
0f, 9.113e-16f, 103.919f, 17834.191f, Single.MaxValue };
long result;
foreach (float value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
value.GetType().Name, value, result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.", value);
}
}
// The example displays the following output:
// -3.4028235E+38 is outside the range of the Int64 type.
// Converted the Single value -1.38E+10 to the Int64 value -13799999488.
// Converted the Single value -1023.299 to the Int64 value -1023.
// Converted the Single value -12.98 to the Int64 value -13.
// Converted the Single value 0 to the Int64 value 0.
// Converted the Single value 9.113E-16 to the Int64 value 0.
// Converted the Single value 103.919 to the Int64 value 104.
// Converted the Single value 17834.191 to the Int64 value 17834.
// 3.4028235E+38 is outside the range of the Int64 type.
let values =
[| Single.MinValue; -1.38e10f; -1023.299f; -12.98f
0f; 9.113e-16f; 103.919f; 17834.191f; Single.MaxValue |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"{value} is outside the range of the Int64 type."
// The example displays the following output:
// -3.40282346638529E+38 is outside the range of the Int64 type.
// -13799999488 is outside the range of the Int64 type.
// Converted the Double value -1023.29901123047 to the Int64 value -1023.
// Converted the Double value -12.9799995422363 to the Int64 value -13.
// Converted the Double value 0 to the Int64 value 0.
// Converted the Double value 9.11299983940444E-16 to the Int64 value 0.
// Converted the Double value 103.918998718262 to the Int64 value 104.
// Converted the Double value 17834.19140625 to the Int64 value 17834.
// 3.40282346638529E+38 is outside the range of the Int64 type.
Dim values() As Single = { Single.MinValue, -1.38e10, -1023.299, -12.98, _
0, 9.113e-16, 103.919, 17834.191, Single.MaxValue }
Dim result As Long
For Each value As Single In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
value.GetType().Name, value, result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", value)
End Try
Next
' The example displays the following output:
' -3.4028235E+38 is outside the range of the Int64 type.
' Converted the Single value -1.38E+10 to the Int64 value -13799999488.
' Converted the Single value -1023.299 to the Int64 value -1023.
' Converted the Single value -12.98 to the Int64 value -13.
' Converted the Single value 0 to the Int64 value 0.
' Converted the Single value 9.113E-16 to the Int64 value 0.
' Converted the Single value 103.919 to the Int64 value 104.
' Converted the Single value 17834.191 to the Int64 value 17834.
' 3.4028235E+38 is outside the range of the Int64 type.
Ver também
Aplica-se a
ToInt64(String, Int32)
Converte a representação da cadeia de um número numa base especificada para um inteiro com sinal equivalente de 64 bits.
public:
static long ToInt64(System::String ^ value, int fromBase);public static long ToInt64(string value, int fromBase);static member ToInt64 : string * int -> int64Public Shared Function ToInt64 (value As String, fromBase As Integer) As LongParâmetros
- value
- String
Uma cadeia que contém o número a converter.
- fromBase
- Int32
A base do número em value, que deve ser 2, 8, 10 ou 16.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente ao número em value, ou 0 (zero) se value for null.
Exceções
fromBase não é 2, 8, 10 ou 16.
-ou-
value, que representa um número assinado não base 10, é precedido por um sinal negativo.
value é Empty.
value contém um carácter que não é um dígito válido na base especificada por fromBase. A mensagem de exceção indica que não há dígitos a converter se o primeiro carácter for value inválido; caso contrário, a mensagem indica que value contém caracteres finais inválidos.
value, que representa um número assinado não base 10, é precedido por um sinal negativo.
-ou-
value representa um número menor que Int64.ValorMinuto ou superior a Int64.ValorMáximo.
Observações
Se fromBase for 16, pode prefixar o número especificado pelo value parâmetro com "0x" ou "0X".
Como o sinal negativo não é suportado para representações numéricas não baseadas em 10, o ToInt64(String, Int32) método assume que os números negativos usam a representação do complemento de dois. Por outras palavras, o método interpreta sempre o bit binário de ordem mais alta de um inteiro longo (bit 63) como o seu bit de sinal. Como resultado, é possível escrever código em que um número não base 10 que esteja fora do alcance do Int64 tipo de dado seja convertido num Int64 valor sem que o método faça exceção. O exemplo seguinte converte MaxValue para a sua representação hexadecimal da cadeia e depois chama o ToInt64(String, Int32) método. Em vez de lançar uma exceção, o método mostra a mensagem, "0xFFFFFFFFFFFFFFFF converte para -1."
// Create a hexadecimal value out of range of the long type.
string value = ulong.MaxValue.ToString("X");
// Use Convert.ToInt64 to convert it back to a number.
try
{
long number = Convert.ToInt64(value, 16);
Console.WriteLine("0x{0} converts to {1}.", value, number);
}
catch (OverflowException)
{
Console.WriteLine("Unable to convert '0x{0}' to a long integer.", value);
}
// Create a hexadecimal value out of range of the long type.
let value = UInt64.MaxValue.ToString "X"
// Use Convert.ToInt64 to convert it back to a number.
try
let number = Convert.ToInt64(value, 16)
printfn $"0x{value} converts to {number}."
with :? OverflowException ->
printfn $"Unable to convert '0x{value}' to a long integer."
' Create a hexadecimal value out of range of the Long type.
Dim value As String = ULong.MaxValue.ToString("X")
' Call Convert.ToInt64 to convert it back to a number.
Try
Dim number As Long = Convert.ToInt64(value, 16)
Console.WriteLine("0x{0} converts to {1}.", value, number)
Catch e As OverflowException
Console.WriteLine("Unable to convert '0x{0}' to a long integer.", value)
End Try
Ao realizar operações binárias ou conversões numéricas, é sempre responsabilidade do programador verificar se um método está a usar a representação numérica apropriada para interpretar um determinado valor. Como o exemplo seguinte ilustra, pode garantir que o método lida adequadamente com os overflows, determinando primeiro se um valor representa um tipo sem sinal ou um tipo assinado ao convertê-lo para a sua representação hexadecimal de cadeias. Lançar uma exceção se o valor original fosse um tipo não assinado, mas a conversão de volta para um inteiro produz um valor cujo bit de sinal está ligado.
// Create a negative hexadecimal value out of range of the Byte type.
ulong sourceNumber = ulong.MaxValue;
bool isSigned = Math.Sign(Convert.ToDouble(sourceNumber.GetType().GetField("MinValue").GetValue(null))) == -1;
string value = sourceNumber.ToString("X");
long targetNumber;
try
{
targetNumber = Convert.ToInt64(value, 16);
if (!isSigned && ((targetNumber & 0x80000000) != 0))
throw new OverflowException();
else
Console.WriteLine("0x{0} converts to {1}.", value, targetNumber);
}
catch (OverflowException)
{
Console.WriteLine("Unable to convert '0x{0}' to a long integer.", value);
}
// Displays the following to the console:
// Unable to convert '0xFFFFFFFFFFFFFFFF' to a long integer.
// Create a negative hexadecimal value out of range of the Byte type.
let sourceNumber = UInt64.MaxValue
let isSigned = sign (Convert.ToDouble(sourceNumber.GetType().GetField("MinValue").GetValue null)) = -1
let value = sourceNumber.ToString "X"
try
let targetNumber = Convert.ToInt64(value, 16)
if not isSigned && targetNumber &&& 0x80000000L <> 0L then
raise (OverflowException())
else
printfn $"0x{value} converts to {targetNumber}."
with :? OverflowException ->
printfn $"Unable to convert '0x{value}' to a long integer."
// Displays the following to the console:
// Unable to convert '0xFFFFFFFFFFFFFFFF' to a long integer.
' Create a negative hexadecimal value out of range of the Long type.
Dim sourceNumber As ULong = ULong.MaxValue
Dim isSigned As Boolean = Math.Sign(sourceNumber.MinValue) = -1
Dim value As String = sourceNumber.ToString("X")
Dim targetNumber As Long
Try
targetNumber = Convert.ToInt64(value, 16)
If Not isSigned And ((targetNumber And &H8000000000) <> 0) Then
Throw New OverflowException()
Else
Console.WriteLine("0x{0} converts to {1}.", value, targetNumber)
End If
Catch e As OverflowException
Console.WriteLine("Unable to convert '0x{0}' to a long integer.", value)
End Try
' Displays the following to the console:
' Unable to convert '0xFFFFFFFFFFFFFFFF' to a long integer.
O exemplo seguinte tenta interpretar cada elemento numa matriz de cadeias como uma cadeia hexadecimal e convertê-la para um inteiro longo.
using System;
public class Example
{
public static void Main()
{
string[] hexStrings = { "8000000000000000", "0FFFFFFFFFFFFFFF",
"f0000000000001000", "00A30", "D", "-13", "GAD" };
foreach (string hexString in hexStrings)
{
try {
long number = Convert.ToInt64(hexString, 16);
Console.WriteLine("Converted '{0}' to {1:N0}.", hexString, number);
}
catch (FormatException) {
Console.WriteLine("'{0}' is not in the correct format for a hexadecimal number.",
hexString);
}
catch (OverflowException) {
Console.WriteLine("'{0}' is outside the range of an Int64.", hexString);
}
catch (ArgumentException) {
Console.WriteLine("'{0}' is invalid in base 16.", hexString);
}
}
}
}
// The example displays the following output:
// Converted '8000000000000000' to -9,223,372,036,854,775,808.
// Converted '0FFFFFFFFFFFFFFF' to 1,152,921,504,606,846,975.
// 'f0000000000001000' is outside the range of an Int64.
// Converted '00A30' to 2,608.
// Converted 'D' to 13.
// '-13' is invalid in base 16.
// 'GAD' is not in the correct format for a hexadecimal number.
open System
let hexStrings =
[| "8000000000000000"; "0FFFFFFFFFFFFFFF"
"f0000000000001000"; "00A30"; "D"; "-13"; "GAD" |]
for hexString in hexStrings do
try
let number = Convert.ToInt64(hexString, 16)
printfn $"Converted '{hexString}' to {number:N0}."
with
| :? FormatException ->
printfn $"'{hexString}' is not in the correct format for a hexadecimal number."
| :? OverflowException ->
printfn $"'{hexString}' is outside the range of an Int64."
| :? ArgumentException ->
printfn $"'{hexString}' is invalid in base 16."
// The example displays the following output:
// Converted '8000000000000000' to -9,223,372,036,854,775,808.
// Converted '0FFFFFFFFFFFFFFF' to 1,152,921,504,606,846,975.
// 'f0000000000001000' is outside the range of an Int64.
// Converted '00A30' to 2,608.
// Converted 'D' to 13.
// '-13' is invalid in base 16.
// 'GAD' is not in the correct format for a hexadecimal number.
Module Example
Public Sub Main()
Dim hexStrings() As String = { "8000000000000000", "0FFFFFFFFFFFFFFF", _
"f0000000000001000", "00A30", "D", "-13", "GAD" }
For Each hexString As String In hexStrings
Try
Dim number As Long = Convert.ToInt64(hexString, 16)
Console.WriteLine("Converted '{0}' to {1:N0}.", hexString, number)
Catch e As FormatException
Console.WriteLine("'{0}' is not in the correct format for a hexadecimal number.", _
hexString)
Catch e As OverflowException
Console.WriteLine("'{0}' is outside the range of an Int64.", hexString)
Catch e As ArgumentException
Console.WriteLine("'{0}' is invalid in base 16.", hexString)
End Try
Next
End Sub
End Module
' The example displays the following output:
' Converted '8000000000000000' to -9,223,372,036,854,775,808.
' Converted '0FFFFFFFFFFFFFFF' to 1,152,921,504,606,846,975.
' 'f0000000000001000' is outside the range of an Int64.
' Converted '00A30' to 2,608.
' Converted 'D' to 13.
' '-13' is invalid in base 16.
' 'GAD' is not in the correct format for a hexadecimal number.
Aplica-se a
ToInt64(String, IFormatProvider)
Converte a representação de cadeia especificada de um número para um inteiro assinado equivalente de 64 bits, usando a informação de formatação específica da cultura.
public:
static long ToInt64(System::String ^ value, IFormatProvider ^ provider);public static long ToInt64(string value, IFormatProvider provider);static member ToInt64 : string * IFormatProvider -> int64Public Shared Function ToInt64 (value As String, provider As IFormatProvider) As LongParâmetros
- value
- String
Uma cadeia que contém o número a converter.
- provider
- IFormatProvider
Um objeto que fornece informação de formatação específica para cada cultura.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente ao número em value, ou 0 (zero) se value for null.
Exceções
value não consiste num sinal opcional seguido de uma sequência de dígitos (0 a 9).
value representa um número menor que Int64.ValorMinuto ou superior a Int64.ValorMáximo.
Exemplos
O exemplo seguinte define um objeto personalizado NumberFormatInfo que reconhece a cadeia "pos" como sinal positivo e a cadeia "neg" como sinal negativo. Depois, tenta converter cada elemento de um array numérico de cadeias para um inteiro usando tanto este fornecedor como o NumberFormatInfo fornecedor da cultura invariante.
using System;
using System.Globalization;
public class Example
{
public static void Main()
{
// Create a NumberFormatInfo object and set the properties that
// affect conversions using Convert.ToInt64(String, IFormatProvider).
NumberFormatInfo customProvider = new NumberFormatInfo();
customProvider.NegativeSign = "neg ";
customProvider.PositiveSign = "pos ";
// Create an array of providers with the custom provider and the
// NumberFormatInfo object for the invariant culture.
NumberFormatInfo[] providers = { customProvider,
NumberFormatInfo.InvariantInfo };
// Define an array of strings to parse.
string[] numericStrings = { "123456789", "+123456789", "pos 123456789",
"-123456789", "neg 123456789", "123456789.",
"123,456,789", "(123456789)",
"9223372036854775808", "-9223372036854775809" };
for (int ctr = 0; ctr < 2; ctr++)
{
IFormatProvider provider = providers[ctr];
Console.WriteLine(ctr == 0 ? "Custom Provider:" : "Invariant Culture:");
foreach (string numericString in numericStrings)
{
Console.Write(" {0,-22} --> ", numericString);
try {
Console.WriteLine("{0,22}", Convert.ToInt32(numericString, provider));
}
catch (FormatException) {
Console.WriteLine("{0,22}", "Unrecognized Format");
}
catch (OverflowException) {
Console.WriteLine("{0,22}", "Overflow");
}
}
Console.WriteLine();
}
}
}
// The example displays the following output:
// Custom Provider:
// 123456789 --> 123456789
// +123456789 --> Unrecognized Format
// pos 123456789 --> 123456789
// -123456789 --> Unrecognized Format
// neg 123456789 --> -123456789
// 123456789. --> Unrecognized Format
// 123,456,789 --> Unrecognized Format
// (123456789) --> Unrecognized Format
// 9223372036854775808 --> Overflow
// -9223372036854775809 --> Unrecognized Format
//
// Invariant Culture:
// 123456789 --> 123456789
// +123456789 --> 123456789
// pos 123456789 --> Unrecognized Format
// -123456789 --> -123456789
// neg 123456789 --> Unrecognized Format
// 123456789. --> Unrecognized Format
// 123,456,789 --> Unrecognized Format
// (123456789) --> Unrecognized Format
// 9223372036854775808 --> Overflow
// -9223372036854775809 --> Overflow
open System
open System.Globalization
// Create a NumberFormatInfo object and set the properties that
// affect conversions using Convert.ToInt64(String, IFormatProvider).
let customProvider = NumberFormatInfo()
customProvider.NegativeSign <- "neg "
customProvider.PositiveSign <- "pos "
// Create an array of providers with the custom provider and the
// NumberFormatInfo object for the invariant culture.
let providers =
[| customProvider; NumberFormatInfo.InvariantInfo |]
// Define an array of strings to parse.
let numericStrings =
[| "123456789"; "+123456789"; "pos 123456789"
"-123456789"; "neg 123456789"; "123456789."
"123,456,789"; "(123456789)"
"9223372036854775808"; "-9223372036854775809" |]
for i = 0 to 2 do
let provider = providers[i]
printfn $"""{if i = 0 then "Custom Provider:" else "Invariant Culture:"}"""
for numericString in numericStrings do
printf $" {numericString,-22} --> "
try
printfn $"{Convert.ToInt32(numericString, provider),22}"
with
| :? FormatException ->
printfn "%22s" "Unrecognized Format"
| :? OverflowException ->
printfn "%22s" "Overflow"
printfn ""
// The example displays the following output:
// Custom Provider:
// 123456789 --> 123456789
// +123456789 --> Unrecognized Format
// pos 123456789 --> 123456789
// -123456789 --> Unrecognized Format
// neg 123456789 --> -123456789
// 123456789. --> Unrecognized Format
// 123,456,789 --> Unrecognized Format
// (123456789) --> Unrecognized Format
// 9223372036854775808 --> Overflow
// -9223372036854775809 --> Unrecognized Format
//
// Invariant Culture:
// 123456789 --> 123456789
// +123456789 --> 123456789
// pos 123456789 --> Unrecognized Format
// -123456789 --> -123456789
// neg 123456789 --> Unrecognized Format
// 123456789. --> Unrecognized Format
// 123,456,789 --> Unrecognized Format
// (123456789) --> Unrecognized Format
// 9223372036854775808 --> Overflow
// -9223372036854775809 --> Overflow
Imports System.Globalization
Public Module Example
Public Sub Main()
' Create a NumberFormatInfo object and set the properties that
' affect conversions using Convert.ToInt64(String, IFormatProvider).
Dim customProvider As New NumberFormatInfo()
customProvider.NegativeSign = "neg "
customProvider.PositiveSign = "pos "
' Create an array of providers with the custom provider and the
' NumberFormatInfo object for the invariant culture.
Dim providers() As NumberFormatInfo = {customProvider, _
NumberFormatInfo.InvariantInfo }
' Define an array of strings to parse.
Dim numericStrings() As String = { "123456789", "+123456789", _
"pos 123456789", "-123456789", _
"neg 123456789", "123456789.", _
"123,456,789", "(123456789)", _
"9223372036854775808", "-9223372036854775809" }
For ctr As Integer = 0 to 1
Dim provider As IFormatProvider = providers(ctr)
Console.WriteLine(IIf(ctr = 0, "Custom Provider:", "Invariant Culture:"))
For Each numericString As String In numericStrings
Console.Write(" {0,-22} --> ", numericString)
Try
Console.WriteLine("{0,22}", Convert.ToInt32(numericString, provider))
Catch e As FormatException
Console.WriteLine("{0,22}", "Unrecognized Format")
Catch e As OverflowException
Console.WriteLine("{0,22}", "Overflow")
End Try
Next
Console.WriteLine()
Next
End Sub
End Module
' The example displays the following output:
' Custom Provider:
' 123456789 --> 123456789
' +123456789 --> Unrecognized Format
' pos 123456789 --> 123456789
' -123456789 --> Unrecognized Format
' neg 123456789 --> -123456789
' 123456789. --> Unrecognized Format
' 123,456,789 --> Unrecognized Format
' (123456789) --> Unrecognized Format
' 9223372036854775808 --> Overflow
' -9223372036854775809 --> Unrecognized Format
'
' Invariant Culture:
' 123456789 --> 123456789
' +123456789 --> 123456789
' pos 123456789 --> Unrecognized Format
' -123456789 --> -123456789
' neg 123456789 --> Unrecognized Format
' 123456789. --> Unrecognized Format
' 123,456,789 --> Unrecognized Format
' (123456789) --> Unrecognized Format
' 9223372036854775808 --> Overflow
' -9223372036854775809 --> Overflow
Observações
O valor de retorno é o resultado da invocação do Int64.Parse método em value.
provider é uma IFormatProvider instância que obtém um NumberFormatInfo objeto. O NumberFormatInfo objeto fornece informação específica da cultura sobre o formato de value. Se provider for null, o NumberFormatInfo para a cultura atual é usado.
Se preferir não tratar uma exceção caso a conversão falhe, pode chamar o Int64.TryParse método em vez disso. Devolve um Boolean valor que indica se a conversão teve sucesso ou falhou.
Aplica-se a
ToInt64(Object, IFormatProvider)
Converte o valor do objeto especificado para um inteiro assinado de 64 bits, usando a informação de formatação específica da cultura.
public:
static long ToInt64(System::Object ^ value, IFormatProvider ^ provider);public static long ToInt64(object value, IFormatProvider provider);static member ToInt64 : obj * IFormatProvider -> int64Public Shared Function ToInt64 (value As Object, provider As IFormatProvider) As LongParâmetros
- value
- Object
Um objeto que implementa a IConvertible interface.
- provider
- IFormatProvider
Um objeto que fornece informação de formatação específica para cada cultura.
Devoluções
Um inteiro com sinal de 64 bits equivalente a value, ou zero se value for null.
Exceções
value não está num formato apropriado.
value representa um número menor que Int64.ValorMinuto ou superior a Int64.ValorMáximo.
Exemplos
O exemplo seguinte define uma classe que implementa IConvertible e uma classe que implementa IFormatProvider. Os objetos da classe que implementa IConvertible contêm um array de Double valores. Um objeto de cada classe é passado para o ToInt64 método. Este método devolve uma média do array de Double valores, usando o objeto que implementa IFormatProvider para determinar como calcular a média.
using System;
using System.Collections;
// Define the types of averaging available in the class
// implementing IConvertible.
public enum AverageType : short
{
None = 0,
GeometricMean = 1,
ArithmeticMean = 2,
Median = 3
};
// Pass an instance of this class to methods that require an
// IFormatProvider. The class instance determines the type of
// average to calculate.
public class AverageInfo : IFormatProvider
{
protected AverageType AvgType;
// Specify the type of averaging in the constructor.
public AverageInfo( AverageType avgType )
{
this.AvgType = avgType;
}
// This method returns a reference to the containing object
// if an object of AverageInfo type is requested.
public object GetFormat( Type argType )
{
if ( argType == typeof( AverageInfo ) )
return this;
else
return null;
}
// Use this property to set or get the type of averaging.
public AverageType TypeOfAverage
{
get { return this.AvgType; }
set { this.AvgType = value; }
}
}
// This class encapsulates an array of double values and implements
// the IConvertible interface. Most of the IConvertible methods
// return an average of the array elements in one of three types:
// arithmetic mean, geometric mean, or median.
public class DataSet : IConvertible
{
protected ArrayList data;
protected AverageInfo defaultProvider;
// Construct the object and add an initial list of values.
// Create a default format provider.
public DataSet( params double[ ] values )
{
data = new ArrayList( values );
defaultProvider =
new AverageInfo( AverageType.ArithmeticMean );
}
// Add additional values with this method.
public int Add( double value )
{
data.Add( value );
return data.Count;
}
// Get, set, and add values with this indexer property.
public double this[ int index ]
{
get
{
if( index >= 0 && index < data.Count )
return (double)data[ index ];
else
throw new InvalidOperationException(
"[DataSet.get] Index out of range." );
}
set
{
if( index >= 0 && index < data.Count )
data[ index ] = value;
else if( index == data.Count )
data.Add( value );
else
throw new InvalidOperationException(
"[DataSet.set] Index out of range." );
}
}
// This property returns the number of elements in the object.
public int Count
{
get { return data.Count; }
}
// This method calculates the average of the object's elements.
protected double Average( AverageType avgType )
{
double SumProd;
if( data.Count == 0 )
return 0.0;
switch( avgType )
{
case AverageType.GeometricMean:
SumProd = 1.0;
for( int Index = 0; Index < data.Count; Index++ )
SumProd *= (double)data[ Index ];
// This calculation will not fail with negative
// elements.
return Math.Sign( SumProd ) * Math.Pow(
Math.Abs( SumProd ), 1.0 / data.Count );
case AverageType.ArithmeticMean:
SumProd = 0.0;
for( int Index = 0; Index < data.Count; Index++ )
SumProd += (double)data[ Index ];
return SumProd / data.Count;
case AverageType.Median:
if( data.Count % 2 == 0 )
return ( (double)data[ data.Count / 2 ] +
(double)data[ data.Count / 2 - 1 ] ) / 2.0;
else
return (double)data[ data.Count / 2 ];
default:
return 0.0;
}
}
// Get the AverageInfo object from the caller's format provider,
// or use the local default.
protected AverageInfo GetAverageInfo( IFormatProvider provider )
{
AverageInfo avgInfo = null;
if( provider != null )
avgInfo = (AverageInfo)provider.GetFormat(
typeof( AverageInfo ) );
if ( avgInfo == null )
return defaultProvider;
else
return avgInfo;
}
// Calculate the average and limit the range.
protected double CalcNLimitAverage( double min, double max,
IFormatProvider provider )
{
// Get the format provider and calculate the average.
AverageInfo avgInfo = GetAverageInfo( provider );
double avg = Average( avgInfo.TypeOfAverage );
// Limit the range, based on the minimum and maximum values
// for the type.
return avg > max ? max : avg < min ? min : avg;
}
// The following elements are required by IConvertible.
// None of these conversion functions throw exceptions. When
// the data is out of range for the type, the appropriate
// MinValue or MaxValue is used.
public TypeCode GetTypeCode( )
{
return TypeCode.Object;
}
public bool ToBoolean( IFormatProvider provider )
{
// ToBoolean is false if the dataset is empty.
if( data.Count <= 0 )
{
return false;
}
// For median averaging, ToBoolean is true if any
// non-discarded elements are nonzero.
else if( AverageType.Median ==
GetAverageInfo( provider ).TypeOfAverage )
{
if (data.Count % 2 == 0 )
return ( (double)data[ data.Count / 2 ] != 0.0 ||
(double)data[ data.Count / 2 - 1 ] != 0.0 );
else
return (double)data[ data.Count / 2 ] != 0.0;
}
// For arithmetic or geometric mean averaging, ToBoolean is
// true if any element of the dataset is nonzero.
else
{
for( int Index = 0; Index < data.Count; Index++ )
if( (double)data[ Index ] != 0.0 )
return true;
return false;
}
}
public byte ToByte( IFormatProvider provider )
{
return Convert.ToByte( CalcNLimitAverage(
Byte.MinValue, Byte.MaxValue, provider ) );
}
public char ToChar( IFormatProvider provider )
{
return Convert.ToChar( Convert.ToUInt16( CalcNLimitAverage(
Char.MinValue, Char.MaxValue, provider ) ) );
}
// Convert to DateTime by adding the calculated average as
// seconds to the current date and time. A valid DateTime is
// always returned.
public DateTime ToDateTime( IFormatProvider provider )
{
double seconds =
Average( GetAverageInfo( provider ).TypeOfAverage );
try
{
return DateTime.Now.AddSeconds( seconds );
}
catch( ArgumentOutOfRangeException )
{
return seconds < 0.0 ? DateTime.MinValue : DateTime.MaxValue;
}
}
public decimal ToDecimal( IFormatProvider provider )
{
// The Double conversion rounds Decimal.MinValue and
// Decimal.MaxValue to invalid Decimal values, so the
// following limits must be used.
return Convert.ToDecimal( CalcNLimitAverage(
-79228162514264330000000000000.0,
79228162514264330000000000000.0, provider ) );
}
public double ToDouble( IFormatProvider provider )
{
return Average( GetAverageInfo(provider).TypeOfAverage );
}
public short ToInt16( IFormatProvider provider )
{
return Convert.ToInt16( CalcNLimitAverage(
Int16.MinValue, Int16.MaxValue, provider ) );
}
public int ToInt32( IFormatProvider provider )
{
return Convert.ToInt32( CalcNLimitAverage(
Int32.MinValue, Int32.MaxValue, provider ) );
}
public long ToInt64( IFormatProvider provider )
{
// The Double conversion rounds Int64.MinValue and
// Int64.MaxValue to invalid Int64 values, so the following
// limits must be used.
return Convert.ToInt64( CalcNLimitAverage(
-9223372036854775000, 9223372036854775000, provider ) );
}
public SByte ToSByte( IFormatProvider provider )
{
return Convert.ToSByte( CalcNLimitAverage(
SByte.MinValue, SByte.MaxValue, provider ) );
}
public float ToSingle( IFormatProvider provider )
{
return Convert.ToSingle( CalcNLimitAverage(
Single.MinValue, Single.MaxValue, provider ) );
}
public UInt16 ToUInt16( IFormatProvider provider )
{
return Convert.ToUInt16( CalcNLimitAverage(
UInt16.MinValue, UInt16.MaxValue, provider ) );
}
public UInt32 ToUInt32( IFormatProvider provider )
{
return Convert.ToUInt32( CalcNLimitAverage(
UInt32.MinValue, UInt32.MaxValue, provider ) );
}
public UInt64 ToUInt64( IFormatProvider provider )
{
// The Double conversion rounds UInt64.MaxValue to an invalid
// UInt64 value, so the following limit must be used.
return Convert.ToUInt64( CalcNLimitAverage(
0, 18446744073709550000.0, provider ) );
}
public object ToType( Type conversionType,
IFormatProvider provider )
{
return Convert.ChangeType( Average(
GetAverageInfo( provider ).TypeOfAverage ),
conversionType );
}
public string ToString( IFormatProvider provider )
{
AverageType avgType = GetAverageInfo( provider ).TypeOfAverage;
return String.Format( "( {0}: {1:G10} )", avgType,
Average( avgType ) );
}
}
class IConvertibleProviderDemo
{
// Display a DataSet with three different format providers.
public static void DisplayDataSet( DataSet ds )
{
string fmt = "{0,-12}{1,20}{2,20}{3,20}";
AverageInfo median = new AverageInfo( AverageType.Median );
AverageInfo geMean =
new AverageInfo( AverageType.GeometricMean );
// Display the dataset elements.
if( ds.Count > 0 )
{
Console.Write( "\nDataSet: [{0}", ds[ 0 ] );
for( int iX = 1; iX < ds.Count; iX++ )
Console.Write( ", {0}", ds[ iX ] );
Console.WriteLine( "]\n" );
}
Console.WriteLine( fmt, "Convert.", "Default",
"Geometric Mean", "Median");
Console.WriteLine( fmt, "--------", "-------",
"--------------", "------");
Console.WriteLine( fmt, "ToBoolean",
Convert.ToBoolean( ds, null ),
Convert.ToBoolean( ds, geMean ),
Convert.ToBoolean( ds, median ) );
Console.WriteLine( fmt, "ToByte",
Convert.ToByte( ds, null ),
Convert.ToByte( ds, geMean ),
Convert.ToByte( ds, median ) );
Console.WriteLine( fmt, "ToChar",
Convert.ToChar( ds, null ),
Convert.ToChar( ds, geMean ),
Convert.ToChar( ds, median ) );
Console.WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}" +
"{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}",
"ToDateTime", Convert.ToDateTime( ds, null ),
Convert.ToDateTime( ds, geMean ),
Convert.ToDateTime( ds, median ) );
Console.WriteLine( fmt, "ToDecimal",
Convert.ToDecimal( ds, null ),
Convert.ToDecimal( ds, geMean ),
Convert.ToDecimal( ds, median ) );
Console.WriteLine( fmt, "ToDouble",
Convert.ToDouble( ds, null ),
Convert.ToDouble( ds, geMean ),
Convert.ToDouble( ds, median ) );
Console.WriteLine( fmt, "ToInt16",
Convert.ToInt16( ds, null ),
Convert.ToInt16( ds, geMean ),
Convert.ToInt16( ds, median ) );
Console.WriteLine( fmt, "ToInt32",
Convert.ToInt32( ds, null ),
Convert.ToInt32( ds, geMean ),
Convert.ToInt32( ds, median ) );
Console.WriteLine( fmt, "ToInt64",
Convert.ToInt64( ds, null ),
Convert.ToInt64( ds, geMean ),
Convert.ToInt64( ds, median ) );
Console.WriteLine( fmt, "ToSByte",
Convert.ToSByte( ds, null ),
Convert.ToSByte( ds, geMean ),
Convert.ToSByte( ds, median ) );
Console.WriteLine( fmt, "ToSingle",
Convert.ToSingle( ds, null ),
Convert.ToSingle( ds, geMean ),
Convert.ToSingle( ds, median ) );
Console.WriteLine( fmt, "ToUInt16",
Convert.ToUInt16( ds, null ),
Convert.ToUInt16( ds, geMean ),
Convert.ToUInt16( ds, median ) );
Console.WriteLine( fmt, "ToUInt32",
Convert.ToUInt32( ds, null ),
Convert.ToUInt32( ds, geMean ),
Convert.ToUInt32( ds, median ) );
Console.WriteLine( fmt, "ToUInt64",
Convert.ToUInt64( ds, null ),
Convert.ToUInt64( ds, geMean ),
Convert.ToUInt64( ds, median ) );
}
public static void Main( )
{
Console.WriteLine( "This example of " +
"the Convert.To<Type>( object, IFormatProvider ) methods " +
"\ngenerates the following output. The example " +
"displays the values \nreturned by the methods, " +
"using several IFormatProvider objects.\n" );
DataSet ds1 = new DataSet(
10.5, 22.2, 45.9, 88.7, 156.05, 297.6 );
DisplayDataSet( ds1 );
DataSet ds2 = new DataSet(
359999.95, 425000, 499999.5, 775000, 1695000 );
DisplayDataSet( ds2 );
}
}
/*
This example of the Convert.To<Type>( object, IFormatProvider ) methods
generates the following output. The example displays the values
returned by the methods, using several IFormatProvider objects.
DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]
Convert. Default Geometric Mean Median
-------- ------- -------------- ------
ToBoolean True True True
ToByte 103 59 67
ToChar g ; C
ToDateTime 2003-05-13 15:04:12 2003-05-13 15:03:28 2003-05-13 15:03:35
ToDecimal 103.491666666667 59.4332135445164 67.3
ToDouble 103.491666666667 59.4332135445164 67.3
ToInt16 103 59 67
ToInt32 103 59 67
ToInt64 103 59 67
ToSByte 103 59 67
ToSingle 103.4917 59.43321 67.3
ToUInt16 103 59 67
ToUInt32 103 59 67
ToUInt64 103 59 67
DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]
Convert. Default Geometric Mean Median
-------- ------- -------------- ------
ToBoolean True True True
ToByte 255 255 255
ToChar ? ? ?
ToDateTime 2003-05-22 07:39:08 2003-05-20 22:28:45 2003-05-19 09:55:48
ToDecimal 750999.89 631577.237188435 499999.5
ToDouble 750999.89 631577.237188435 499999.5
ToInt16 32767 32767 32767
ToInt32 751000 631577 500000
ToInt64 751000 631577 500000
ToSByte 127 127 127
ToSingle 750999.9 631577.3 499999.5
ToUInt16 65535 65535 65535
ToUInt32 751000 631577 500000
ToUInt64 751000 631577 500000
*/
open System
open System.Collections
// Define the types of averaging available in the class
// implementing IConvertible.
type AverageType =
| None = 0s
| GeometricMean = 1s
| ArithmeticMean = 2s
| Median = 3s
// Pass an instance of this class to methods that require an
// IFormatProvider. The class instance determines the type of
// average to calculate.
[<AllowNullLiteral>]
type AverageInfo(avgType: AverageType) =
// Use this property to set or get the type of averaging.
member val TypeOfAverage = avgType with get, set
interface IFormatProvider with
// This method returns a reference to the containing object
// if an object of AverageInfo type is requested.
member this.GetFormat(argType: Type) =
if argType = typeof<AverageInfo> then
this
else
null
// This class encapsulates an array of double values and implements
// the IConvertible interface. Most of the IConvertible methods
// an average of the array elements in one of three types:
// arithmetic mean, geometric mean, or median.
type DataSet([<ParamArray>] values: double[]) =
let data = ResizeArray values
let defaultProvider =
AverageInfo AverageType.ArithmeticMean
// Add additional values with this method.
member _.Add(value: double) =
data.Add value
data.Count
// Get, set, and add values with this indexer property.
member _.Item
with get (index) =
if index >= 0 && index < data.Count then
data[index]
else
raise (InvalidOperationException "[DataSet.get] Index out of range.")
and set index value =
if index >= 0 && index < data.Count then
data[index] <- value
elif index = data.Count then
data.Add value
else
raise (InvalidOperationException "[DataSet.set] Index out of range.")
// This property returns the number of elements in the object.
member _.Count =
data.Count
// This method calculates the average of the object's elements.
member _.Average(avgType: AverageType) =
if data.Count = 0 then
0.0
else
match avgType with
| AverageType.GeometricMean ->
let sumProd =
Seq.reduce ( * ) data
// This calculation will not fail with negative
// elements.
(sign sumProd |> float) * Math.Pow(abs sumProd, 1.0 / (float data.Count))
| AverageType.ArithmeticMean ->
Seq.average data
| AverageType.Median ->
if data.Count % 2 = 0 then
(data[data.Count / 2] + data[data.Count / 2 - 1]) / 2.0
else
data[ data.Count / 2]
| _ ->
0.0
// Get the AverageInfo object from the caller's format provider,
// or use the local default.
member _.GetAverageInfo(provider: IFormatProvider) =
let avgInfo =
if provider <> null then
provider.GetFormat typeof<AverageInfo> :?> AverageInfo
else
null
if avgInfo = null then
defaultProvider
else
avgInfo
// Calculate the average and limit the range.
member this.CalcNLimitAverage(min: double, max: double, provider: IFormatProvider) =
// Get the format provider and calculate the average.
let avgInfo = this.GetAverageInfo provider
let avg = this.Average avgInfo.TypeOfAverage
// Limit the range, based on the minimum and maximum values
// for the type.
if avg > max then max elif avg < min then min else avg
// The following elements are required by IConvertible.
interface IConvertible with
// None of these conversion functions throw exceptions. When
// the data is out of range for the type, the appropriate
// MinValue or MaxValue is used.
member _.GetTypeCode() =
TypeCode.Object
member this.ToBoolean(provider: IFormatProvider) =
// ToBoolean is false if the dataset is empty.
if data.Count <= 0 then
false
// For median averaging, ToBoolean is true if any
// non-discarded elements are nonzero.
elif AverageType.Median = this.GetAverageInfo(provider).TypeOfAverage then
if data.Count % 2 = 0 then
(data[data.Count / 2] <> 0.0 || data[data.Count / 2 - 1] <> 0.0)
else
data[data.Count / 2] <> 0.0
// For arithmetic or geometric mean averaging, ToBoolean is
// true if any element of the dataset is nonzero.
else
Seq.exists (fun x -> x <> 0.0) data
member this.ToByte(provider: IFormatProvider) =
Convert.ToByte(this.CalcNLimitAverage(float Byte.MinValue, float Byte.MaxValue, provider) )
member this.ToChar(provider: IFormatProvider) =
Convert.ToChar(Convert.ToUInt16(this.CalcNLimitAverage(float Char.MinValue, float Char.MaxValue, provider) ) )
// Convert to DateTime by adding the calculated average as
// seconds to the current date and time. A valid DateTime is
// always returned.
member this.ToDateTime(provider: IFormatProvider) =
let seconds = this.Average(this.GetAverageInfo(provider).TypeOfAverage)
try
DateTime.Now.AddSeconds seconds
with :? ArgumentOutOfRangeException ->
if seconds < 0.0 then DateTime.MinValue else DateTime.MaxValue
member this.ToDecimal(provider: IFormatProvider) =
// The Double conversion rounds Decimal.MinValue and
// Decimal.MaxValue to invalid Decimal values, so the
// following limits must be used.
Convert.ToDecimal(this.CalcNLimitAverage(-79228162514264330000000000000.0, 79228162514264330000000000000.0, provider) )
member this.ToDouble(provider: IFormatProvider) =
this.Average(this.GetAverageInfo(provider).TypeOfAverage)
member this.ToInt16(provider: IFormatProvider) =
Convert.ToInt16(this.CalcNLimitAverage(float Int16.MinValue, float Int16.MaxValue, provider) )
member this.ToInt32(provider: IFormatProvider) =
Convert.ToInt32(this.CalcNLimitAverage(Int32.MinValue, Int32.MaxValue, provider) )
member this.ToInt64(provider: IFormatProvider) =
// The Double conversion rounds Int64.MinValue and
// Int64.MaxValue to invalid Int64 values, so the following
// limits must be used.
Convert.ToInt64(this.CalcNLimitAverage(-9223372036854775000., 9223372036854775000., provider) )
member this.ToSByte(provider: IFormatProvider) =
Convert.ToSByte(this.CalcNLimitAverage(float SByte.MinValue, float SByte.MaxValue, provider) )
member this.ToSingle(provider: IFormatProvider) =
Convert.ToSingle(this.CalcNLimitAverage(float Single.MinValue, float Single.MaxValue, provider) )
member this.ToUInt16(provider: IFormatProvider) =
Convert.ToUInt16(this.CalcNLimitAverage(float UInt16.MinValue, float UInt16.MaxValue, provider) )
member this.ToUInt32(provider: IFormatProvider) =
Convert.ToUInt32(this.CalcNLimitAverage(float UInt32.MinValue, float UInt32.MaxValue, provider) )
member this.ToUInt64(provider: IFormatProvider) =
// The Double conversion rounds UInt64.MaxValue to an invalid
// UInt64 value, so the following limit must be used.
Convert.ToUInt64(this.CalcNLimitAverage(0, 18446744073709550000.0, provider) )
member this.ToType(conversionType: Type, provider: IFormatProvider) =
Convert.ChangeType(this.Average(this.GetAverageInfo(provider).TypeOfAverage), conversionType)
member this.ToString(provider: IFormatProvider) =
let avgType = this.GetAverageInfo(provider).TypeOfAverage
$"( {avgType}: {this.Average avgType:G10} )"
// Display a DataSet with three different format providers.
let displayDataSet (ds: DataSet) =
let fmt obj1 obj2 obj3 obj4 = printfn $"{obj1,-12}{obj2,20}{obj3,20}{obj4,20}"
let median = AverageInfo AverageType.Median
let geMean =
AverageInfo AverageType.GeometricMean
// Display the dataset elements.
if ds.Count > 0 then
printf $"\nDataSet: [{ds[0]}"
for i = 1 to ds.Count - 1 do
printf $", {ds[i]}"
printfn "]\n"
fmt "Convert." "Default" "Geometric Mean" "Median"
fmt "--------" "-------" "--------------" "------"
fmt "ToBoolean"
(Convert.ToBoolean(ds, null))
(Convert.ToBoolean(ds, geMean))
(Convert.ToBoolean(ds, median))
fmt "ToByte"
(Convert.ToByte(ds, null))
(Convert.ToByte(ds, geMean))
(Convert.ToByte(ds, median))
fmt "ToChar"
(Convert.ToChar(ds, null))
(Convert.ToChar(ds, geMean))
(Convert.ToChar(ds, median))
printfn $"""{"ToDateTime",-12}{Convert.ToDateTime(ds, null).ToString "20:yyyy-MM-dd HH:mm:ss"}{Convert.ToDateTime(ds, geMean).ToString "20:yyyy-MM-dd HH:mm:ss"}{Convert.ToDateTime(ds, median).ToString "20:yyyy-MM-dd HH:mm:ss"}"""
fmt "ToDecimal"
(Convert.ToDecimal(ds, null))
(Convert.ToDecimal(ds, geMean))
(Convert.ToDecimal(ds, median))
fmt "ToDouble"
(Convert.ToDouble(ds, null))
(Convert.ToDouble(ds, geMean))
(Convert.ToDouble(ds, median))
fmt "ToInt16"
(Convert.ToInt16(ds, null))
(Convert.ToInt16(ds, geMean))
(Convert.ToInt16(ds, median))
fmt "ToInt32"
(Convert.ToInt32(ds, null))
(Convert.ToInt32(ds, geMean))
(Convert.ToInt32(ds, median))
fmt "ToInt64"
(Convert.ToInt64(ds, null))
(Convert.ToInt64(ds, geMean))
(Convert.ToInt64(ds, median))
fmt "ToSByte"
(Convert.ToSByte(ds, null))
(Convert.ToSByte(ds, geMean))
(Convert.ToSByte(ds, median))
fmt "ToSingle"
(Convert.ToSingle(ds, null))
(Convert.ToSingle(ds, geMean))
(Convert.ToSingle(ds, median))
fmt "ToUInt16"
(Convert.ToUInt16(ds, null))
(Convert.ToUInt16(ds, geMean))
(Convert.ToUInt16(ds, median))
fmt "ToUInt32"
(Convert.ToUInt32(ds, null))
(Convert.ToUInt32(ds, geMean))
(Convert.ToUInt32(ds, median))
fmt "ToUInt64"
(Convert.ToUInt64(ds, null))
(Convert.ToUInt64(ds, geMean))
(Convert.ToUInt64(ds, median))
printfn
"""This example of the Convert.To<Type>( object, IFormatprovider) methods
generates the following output. The example displays the values
returned by the methods, using several IFormatProvider objects.
"""
let ds1 = DataSet(10.5, 22.2, 45.9, 88.7, 156.05, 297.6)
displayDataSet ds1
let ds2 = DataSet(359999.95, 425000, 499999.5, 775000, 1695000)
displayDataSet ds2
// This example of the Convert.To<Type>( object, IFormatprovider) methods
// generates the following output. The example displays the values
// returned by the methods, using several IFormatProvider objects.
//
// DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]
//
// Convert. Default Geometric Mean Median
// -------- ------- -------------- ------
// ToBoolean True True True
// ToByte 103 59 67
// ToChar g ; C
// ToDateTime 2003-05-13 15:04:12 2003-05-13 15:03:28 2003-05-13 15:03:35
// ToDecimal 103.491666666667 59.4332135445164 67.3
// ToDouble 103.491666666667 59.4332135445164 67.3
// ToInt16 103 59 67
// ToInt32 103 59 67
// ToInt64 103 59 67
// ToSByte 103 59 67
// ToSingle 103.4917 59.43321 67.3
// ToUInt16 103 59 67
// ToUInt32 103 59 67
// ToUInt64 103 59 67
//
// DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]
//
// Convert. Default Geometric Mean Median
// -------- ------- -------------- ------
// ToBoolean True True True
// ToByte 255 255 255
// ToChar ? ? ?
// ToDateTime 2003-05-22 07:39:08 2003-05-20 22:28:45 2003-05-19 09:55:48
// ToDecimal 750999.89 631577.237188435 499999.5
// ToDouble 750999.89 631577.237188435 499999.5
// ToInt16 32767 32767 32767
// ToInt32 751000 631577 500000
// ToInt64 751000 631577 500000
// ToSByte 127 127 127
// ToSingle 750999.9 631577.3 499999.5
// ToUInt16 65535 65535 65535
// ToUInt32 751000 631577 500000
// ToUInt64 751000 631577 500000
Imports System.Collections
Module IConvertibleProviderDemo
' Define the types of averaging available in the class
' implementing IConvertible.
Enum AverageType as Short
None = 0
GeometricMean = 1
ArithmeticMean = 2
Median = 3
End Enum
' Pass an instance of this class to methods that require an
' IFormatProvider. The class instance determines the type of
' average to calculate.
Public Class AverageInfo
Implements IFormatProvider
Protected AvgType As AverageType
' Specify the type of averaging in the constructor.
Public Sub New( avgType As AverageType )
Me.AvgType = avgType
End Sub
' This method returns a reference to the containing object
' if an object of AverageInfo type is requested.
Public Function GetFormat( argType As Type ) As Object _
Implements IFormatProvider.GetFormat
If argType Is GetType( AverageInfo ) Then
Return Me
Else
Return Nothing
End If
End Function
' Use this property to set or get the type of averaging.
Public Property TypeOfAverage( ) As AverageType
Get
Return Me.AvgType
End Get
Set( ByVal value as AverageType )
Me.AvgType = value
End Set
End Property
End Class
' This class encapsulates an array of Double values and implements
' the IConvertible interface. Most of the IConvertible methods
' return an average of the array elements in one of three types:
' arithmetic mean, geometric mean, or median.
Public Class DataSet
Implements IConvertible
Protected data As ArrayList
Protected defaultProvider As AverageInfo
' Construct the object and add an initial list of values.
' Create a default format provider.
Public Sub New( ParamArray values( ) As Double )
data = New ArrayList( values )
defaultProvider = New AverageInfo( _
AverageType.ArithmeticMean )
End Sub
' Add additional values with this method.
Public Function Add( value As Double ) As Integer
data.Add( value )
Return data.Count
End Function
' Get, set, and add values with this indexer property.
Default Public Property Item(index As Integer) As Double
Get
If index >= 0 AndAlso index < data.Count Then
Return System.Convert.ToDouble( data( index ) )
Else
Throw New InvalidOperationException( _
"[DataSet.get] Index out of range." )
End If
End Get
Set
If index >= 0 AndAlso index < data.Count Then
data( index ) = value
ElseIf index = data.Count Then
data.Add( value )
Else
Throw New InvalidOperationException( _
"[DataSet.set] Index out of range." )
End If
End Set
End Property
' This property returns the number of elements in the object.
Public ReadOnly Property Count( ) As Integer
Get
Return data.Count
End Get
End Property
' This method calculates the average of the object's elements.
Protected Function Average( ByVal avgType As AverageType ) As Double
Dim SumProd As Double
Dim Index As Integer
If data.Count = 0 Then Return 0.0
Select Case avgType
Case AverageType.GeometricMean
SumProd = 1.0
For Index = 0 To data.Count - 1
SumProd *= data( Index )
Next Index
' This calculation will not fail with negative
' elements.
Return Math.Sign( SumProd ) * Math.Pow( _
Math.Abs( SumProd ), 1.0 / data.Count )
Case AverageType.ArithmeticMean
SumProd = 0.0
For Index = 0 To data.Count - 1
SumProd += data( Index )
Next Index
Return SumProd / data.Count
Case AverageType.Median
If data.Count Mod 2 = 0 Then
Return ( data( data.Count \ 2 ) + _
data( data.Count \ 2 - 1 ) ) / 2.0
Else
Return data( data.Count \ 2 )
End If
End Select
End Function
' Get the AverageInfo object from the caller's format
' provider, or use the local default.
Protected Function GetAverageInfo( _
provider As IFormatProvider ) As AverageInfo
Dim avgInfo As AverageInfo = Nothing
If Not provider Is Nothing Then
avgInfo = provider.GetFormat( GetType( AverageInfo ) )
End If
Return IIf( avgInfo Is Nothing, defaultProvider, avgInfo )
End Function
' Calculate the average and limit the range.
Protected Function CalcNLimitAverage( min As Double, _
max As Double, provider as IFormatProvider ) As Double
' Get the format provider and calculate the average.
Dim avgInfo As AverageInfo = GetAverageInfo( provider )
Dim avg As Double = Average( avgInfo.TypeOfAverage )
' Limit the range, based on the minimum and maximum values
' for the type.
Return IIf( avg > max, max, IIf( avg < min, min, avg ) )
End Function
' The following elements are required by IConvertible.
' None of these conversion functions throw exceptions. When
' the data is out of range for the type, the appropriate
' MinValue or MaxValue is used.
Public Function GetTypeCode( ) As TypeCode _
Implements IConvertible.GetTypeCode
Return TypeCode.Object
End Function
Function ToBoolean( ByVal provider As IFormatProvider ) As _
Boolean Implements IConvertible.ToBoolean
' ToBoolean is false if the dataset is empty.
If data.Count <= 0 Then
Return False
' For median averaging, ToBoolean is true if any
' non-discarded elements are nonzero.
ElseIf AverageType.Median = _
GetAverageInfo( provider ).TypeOfAverage Then
If data.Count Mod 2 = 0 Then
Return ( data( data.Count \ 2 ) <> 0.0 Or _
data( data.Count \ 2 - 1 ) <> 0.0 )
Else
Return data( data.Count \ 2 ) <> 0.0
End If
' For arithmetic or geometric mean averaging, ToBoolean is
' true if any element of the dataset is nonzero.
Else
Dim Index As Integer
For Index = 0 To data.Count - 1
If data( Index ) <> 0.0 Then Return True
Next Index
Return False
End If
End Function
Function ToByte( ByVal provider As IFormatProvider ) As Byte _
Implements IConvertible.ToByte
Return Convert.ToByte( CalcNLimitAverage( _
Byte.MinValue, Byte.MaxValue, provider ) )
End Function
Function ToChar( ByVal provider As IFormatProvider ) As Char _
Implements IConvertible.ToChar
Return Convert.ToChar( Convert.ToUInt16( _
CalcNLimitAverage( 0.0, &HFFFF, provider ) ) )
End Function
' Convert to DateTime by adding the calculated average as
' seconds to the current date and time. A valid DateTime is
' always returned.
Function ToDateTime( ByVal provider As IFormatProvider ) As _
DateTime Implements IConvertible.ToDateTime
Dim seconds As Double = Average( _
GetAverageInfo( provider ).TypeOfAverage )
Try
Return DateTime.Now.AddSeconds( seconds )
Catch ex As ArgumentOutOfRangeException
Return IIf( seconds < 0.0, DateTime.MinValue, _
DateTime.MaxValue )
End Try
End Function
Function ToDecimal( ByVal provider As IFormatProvider ) As _
Decimal Implements IConvertible.ToDecimal
' The Double conversion rounds Decimal.MinValue and
' Decimal.MaxValue to invalid Decimal values, so the
' following limits must be used.
Return Convert.ToDecimal( CalcNLimitAverage( _
-79228162514264330000000000000.0, _
79228162514264330000000000000.0, provider ) )
End Function
Function ToDouble( ByVal provider As IFormatProvider) As _
Double Implements IConvertible.ToDouble
Return Average( GetAverageInfo( provider ).TypeOfAverage )
End Function
Function ToInt16( ByVal provider As IFormatProvider ) As _
Short Implements IConvertible.ToInt16
Return Convert.ToInt16( CalcNLimitAverage( _
Int16.MinValue, Int16.MaxValue, provider ) )
End Function
Function ToInt32( ByVal provider As IFormatProvider ) As _
Integer Implements IConvertible.ToInt32
Return Convert.ToInt32( CalcNLimitAverage( _
Int32.MinValue, Int32.MaxValue, provider ) )
End Function
Function ToInt64( ByVal provider As IFormatProvider ) As Long _
Implements IConvertible.ToInt64
' The Double conversion rounds Int64.MinValue and
' Int64.MaxValue to invalid Long values, so the following
' limits must be used.
Return Convert.ToInt64( CalcNLimitAverage( _
-9223372036854775000, 9223372036854775000, provider ) )
End Function
Function ToSByte( ByVal provider As IFormatProvider ) As _
SByte Implements IConvertible.ToSByte
' SByte.MinValue and SByte.MaxValue are not defined in
' Visual Basic.
Return Convert.ToSByte( CalcNLimitAverage( _
-128, 127, provider ) )
End Function
Function ToSingle( ByVal provider As IFormatProvider ) As _
Single Implements IConvertible.ToSingle
Return Convert.ToSingle( CalcNLimitAverage( _
Single.MinValue, Single.MaxValue, provider ) )
End Function
Function ToUInt16( ByVal provider As IFormatProvider ) As _
UInt16 Implements IConvertible.ToUInt16
' UInt16.MinValue and UInt16.MaxValue are not defined in
' Visual Basic.
Return Convert.ToUInt16( CalcNLimitAverage( _
0, &HFFFF, provider ) )
End Function
Function ToUInt32( ByVal provider As IFormatProvider ) As _
UInt32 Implements IConvertible.ToUInt32
' UInt32.MinValue and UInt32.MaxValue are not defined in
' Visual Basic.
Return Convert.ToUInt32( CalcNLimitAverage( _
0, 4294967295, provider ) )
End Function
Function ToUInt64( ByVal provider As IFormatProvider ) As _
UInt64 Implements IConvertible.ToUInt64
' UInt64.MinValue and UInt64.MaxValue are not defined in
' Visual Basic. The Double conversion would have rounded
' UInt64.MaxValue, so the following limit must be used.
Return Convert.ToUInt64( CalcNLimitAverage( _
0, 18446744073709550000.0, provider ) )
End Function
Function ToType( ByVal conversionType As Type, _
ByVal provider As IFormatProvider) As Object _
Implements IConvertible.ToType
Return Convert.ChangeType( Average( GetAverageInfo( _
provider ).TypeOfAverage ), conversionType )
End Function
Overloads Function ToString( ByVal provider As IFormatProvider _
) As String Implements IConvertible.ToString
Dim avgType as AverageType = _
GetAverageInfo( provider ).TypeOfAverage
Return String.Format( "( {0}: {1:G10} )", avgType, _
Average( avgType ) )
End Function
End Class
' Display a DataSet with three different format providers.
Sub DisplayDataSet( ds As DataSet )
Dim fmt As String = "{0,-12}{1,20}{2,20}{3,20}"
Dim median As AverageInfo = New AverageInfo( AverageType.Median )
Dim geMean As AverageInfo = _
New AverageInfo( AverageType.GeometricMean )
Dim iX As Integer
' Display the dataset elements.
If ds.Count > 0 Then
Console.Write( vbCrLf & "DataSet: [{0}", ds( 0 ) )
For iX = 1 To ds.Count - 1
Console.Write( ", {0}", ds( iX ) )
Next iX
Console.WriteLine( "]" & vbCrLf )
End If
Console.WriteLine( fmt, "Convert.", "Default", _
"Geometric Mean", "Median" )
Console.WriteLine( fmt, "--------", "-------", _
"--------------", "------" )
Console.WriteLine( fmt, "ToBoolean", _
Convert.ToBoolean( ds, Nothing ), _
Convert.ToBoolean( ds, geMean ), _
Convert.ToBoolean( ds, median ) )
Console.WriteLine( fmt, "ToByte", _
Convert.ToByte( ds, Nothing ), _
Convert.ToByte( ds, geMean ), _
Convert.ToByte( ds, median ) )
Console.WriteLine( fmt, "ToChar", _
Convert.ToChar( ds, Nothing ), _
Convert.ToChar( ds, geMean ), _
Convert.ToChar( ds, median ) )
Console.WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}" & _
"{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}", _
"ToDateTime", Convert.ToDateTime( ds, Nothing ), _
Convert.ToDateTime( ds, geMean ), _
Convert.ToDateTime( ds, median ) )
Console.WriteLine( fmt, "ToDecimal", _
Convert.ToDecimal( ds, Nothing ), _
Convert.ToDecimal( ds, geMean ), _
Convert.ToDecimal( ds, median ) )
Console.WriteLine( fmt, "ToDouble", _
Convert.ToDouble( ds, Nothing ), _
Convert.ToDouble( ds, geMean ), _
Convert.ToDouble( ds, median ) )
Console.WriteLine( fmt, "ToInt16", _
Convert.ToInt16( ds, Nothing ), _
Convert.ToInt16( ds, geMean ), _
Convert.ToInt16( ds, median ) )
Console.WriteLine( fmt, "ToInt32", _
Convert.ToInt32( ds, Nothing ), _
Convert.ToInt32( ds, geMean ), _
Convert.ToInt32( ds, median ) )
Console.WriteLine( fmt, "ToInt64", _
Convert.ToInt64( ds, Nothing ), _
Convert.ToInt64( ds, geMean ), _
Convert.ToInt64( ds, median ) )
Console.WriteLine( fmt, "ToSByte", _
Convert.ToSByte( ds, Nothing ), _
Convert.ToSByte( ds, geMean ), _
Convert.ToSByte( ds, median ) )
Console.WriteLine( fmt, "ToSingle", _
Convert.ToSingle( ds, Nothing ), _
Convert.ToSingle( ds, geMean ), _
Convert.ToSingle( ds, median ) )
Console.WriteLine( fmt, "ToUInt16", _
Convert.ToUInt16( ds, Nothing ), _
Convert.ToUInt16( ds, geMean ), _
Convert.ToUInt16( ds, median ) )
Console.WriteLine( fmt, "ToUInt32", _
Convert.ToUInt32( ds, Nothing ), _
Convert.ToUInt32( ds, geMean ), _
Convert.ToUInt32( ds, median ) )
Console.WriteLine( fmt, "ToUInt64", _
Convert.ToUInt64( ds, Nothing ), _
Convert.ToUInt64( ds, geMean ), _
Convert.ToUInt64( ds, median ) )
End Sub
Sub Main( )
Console.WriteLine( _
"This example of the Convert.To<Type>( Object, " & _
"IFormatProvider ) methods " & vbCrLf & "generates " & _
"the following output. The example displays the " & _
"values " & vbCrLf & "returned by the methods, " & _
"using several IFormatProvider objects." & vbCrLf )
Dim ds1 As New DataSet( 10.5, 22.2, 45.9, 88.7, 156.05, 297.6 )
DisplayDataSet( ds1 )
Dim ds2 As New DataSet( _
359999.95, 425000, 499999.5, 775000, 1695000 )
DisplayDataSet( ds2 )
End Sub
End Module
' This example of the Convert.To<Type>( Object, IFormatProvider ) methods
' generates the following output. The example displays the values
' returned by the methods, using several IFormatProvider objects.
'
' DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]
'
' Convert. Default Geometric Mean Median
' -------- ------- -------------- ------
' ToBoolean True True True
' ToByte 103 59 67
' ToChar g ; C
' ToDateTime 2003-05-13 14:52:53 2003-05-13 14:52:09 2003-05-13 14:52:17
' ToDecimal 103.491666666667 59.4332135445164 67.3
' ToDouble 103.491666666667 59.4332135445164 67.3
' ToInt16 103 59 67
' ToInt32 103 59 67
' ToInt64 103 59 67
' ToSByte 103 59 67
' ToSingle 103.4917 59.43321 67.3
' ToUInt16 103 59 67
' ToUInt32 103 59 67
' ToUInt64 103 59 67
'
' DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]
'
' Convert. Default Geometric Mean Median
' -------- ------- -------------- ------
' ToBoolean True True True
' ToByte 255 255 255
' ToChar ? ? ?
' ToDateTime 2003-05-22 07:27:49 2003-05-20 22:17:27 2003-05-19 09:44:29
' ToDecimal 750999.89 631577.237188435 499999.5
' ToDouble 750999.89 631577.237188435 499999.5
' ToInt16 32767 32767 32767
' ToInt32 751000 631577 500000
' ToInt64 751000 631577 500000
' ToSByte 127 127 127
' ToSingle 750999.9 631577.3 499999.5
' ToUInt16 65535 65535 65535
' ToUInt32 751000 631577 500000
' ToUInt64 751000 631577 500000
Observações
O valor de retorno é o resultado da invocação do IConvertible.ToInt64 método do tipo subjacente de value.
provider permite ao utilizador especificar informações de conversão específicas da cultura sobre o conteúdo de value. Por exemplo, se value for a String que representa um número, provider poderia fornecer informação específica da cultura sobre a notação usada para representar esse número.
Os tipos base ignoram provider; no entanto, o parâmetro pode ser usado se value for um tipo definido pelo utilizador que implemente a IConvertible interface.
Aplica-se a
ToInt64(UInt64)
Importante
Esta API não está em conformidade com CLS.
Converte o valor do inteiro não assinado especificado de 64 bits para um inteiro com sinal equivalente de 64 bits.
public:
static long ToInt64(System::UInt64 value);[System.CLSCompliant(false)]
public static long ToInt64(ulong value);[<System.CLSCompliant(false)>]
static member ToInt64 : uint64 -> int64Public Shared Function ToInt64 (value As ULong) As LongParâmetros
- value
- UInt64
O inteiro não assinado de 64 bits a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente a value.
- Atributos
Exceções
value é maior do que Int64.MaxValue.
Exemplos
O exemplo seguinte tenta converter cada elemento de um array de inteiros longos sem sinal num inteiro longo.
ulong[] numbers = { UInt64.MinValue, 121, 340, UInt64.MaxValue };
long result;
foreach (ulong number in numbers)
{
try {
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.",
number.GetType().Name, number);
}
}
// The example displays the following output:
// Converted the UInt64 value 0 to a Int32 value 0.
// Converted the UInt64 value 121 to a Int32 value 121.
// Converted the UInt64 value 340 to a Int32 value 340.
// The UInt64 value 18446744073709551615 is outside the range of the Int64 type.
let numbers =
[| UInt64.MinValue; 121uL; 340uL; UInt64.MaxValue |]
for number in numbers do
try
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"The {number.GetType().Name} value {number} is outside the range of the Int64 type."
// The example displays the following output:
// Converted the UInt64 value 0 to a Int32 value 0.
// Converted the UInt64 value 121 to a Int32 value 121.
// Converted the UInt64 value 340 to a Int32 value 340.
// The UInt64 value 18446744073709551615 is outside the range of the Int64 type.
Dim numbers() As ULong = { UInt64.MinValue, 121, 340, UInt64.MaxValue }
Dim result As Long
For Each number As ULong In numbers
Try
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", _
number.GetType().Name, number)
End Try
Next
' The example displays the following output:
' Converted the UInt64 value 0 to the Int64 value 0.
' Converted the UInt64 value 121 to the Int64 value 121.
' Converted the UInt64 value 340 to the Int64 value 340.
' The UInt64 value 18446744073709551615 is outside the range of the Int64 type.
Aplica-se a
ToInt64(UInt32)
Importante
Esta API não está em conformidade com CLS.
Converte o valor do inteiro não assinado especificado de 32 bits para um inteiro assinado equivalente de 64 bits.
public:
static long ToInt64(System::UInt32 value);[System.CLSCompliant(false)]
public static long ToInt64(uint value);[<System.CLSCompliant(false)>]
static member ToInt64 : uint32 -> int64Public Shared Function ToInt64 (value As UInteger) As LongParâmetros
- value
- UInt32
O inteiro não assinado de 32 bits a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente a value.
- Atributos
Exemplos
O exemplo seguinte converte cada elemento de um array de inteiros sem sinal num inteiro longo.
uint[] numbers = { UInt32.MinValue, 121, 340, UInt32.MaxValue };
long result;
foreach (uint number in numbers)
{
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1:N0} to the {2} value {3:N0}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the UInt32 value 0 to the Int64 value 0.
// Converted the UInt32 value 121 to the Int64 value 121.
// Converted the UInt32 value 340 to the Int64 value 340.
// Converted the UInt32 value 4,294,967,295 to the Int64 value 4,294,967,295.
let numbers =
[| UInt32.MinValue; 121u; 340u; UInt32.MaxValue |]
for number in numbers do
try
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"The {number.GetType().Name} value {number} is outside the range of the Int64 type."
// The example displays the following output:
// Converted the UInt32 value 0 to the Int64 value 0.
// Converted the UInt32 value 121 to the Int64 value 121.
// Converted the UInt32 value 340 to the Int64 value 340.
// The UInt32 value 4294967295 is outside the range of the Int64 type.
Dim numbers() As UInteger = { UInt32.MinValue, 121, 340, UInt32.MaxValue }
Dim result As Long
For Each number As UInteger In numbers
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1:N0} to the {2} value {3:N0}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the UInt32 value 0 to the Int64 value 0.
' Converted the UInt32 value 121 to the Int64 value 121.
' Converted the UInt32 value 340 to the Int64 value 340.
' Converted the UInt32 value 4,294,967,295 to the Int64 value 4,294,967,295.
Aplica-se a
ToInt64(UInt16)
Importante
Esta API não está em conformidade com CLS.
Converte o valor do inteiro não assinado especificado de 16 bits para o equivalente inteiro com sinal de 64 bits.
public:
static long ToInt64(System::UInt16 value);[System.CLSCompliant(false)]
public static long ToInt64(ushort value);[<System.CLSCompliant(false)>]
static member ToInt64 : uint16 -> int64Public Shared Function ToInt64 (value As UShort) As LongParâmetros
- value
- UInt16
O inteiro não assinado de 16 bits a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente a value.
- Atributos
Exemplos
O exemplo seguinte converte cada elemento de um array de inteiros sem sinal de 16 bits num inteiro longo.
ushort[] numbers = { UInt16.MinValue, 121, 340, UInt16.MaxValue };
long result;
foreach (ushort number in numbers)
{
try {
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.",
number.GetType().Name, number);
}
}
// The example displays the following output:
// Converted the UInt16 value 0 to the Int64 value 0.
// Converted the UInt16 value 121 to the Int64 value 121.
// Converted the UInt16 value 340 to the Int64 value 340.
// Converted the UInt16 value 65535 to the Int64 value 65535.
let numbers =
[| UInt16.MinValue; 121us; 340us; UInt16.MaxValue |]
for number in numbers do
try
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"The {number.GetType().Name} value {number} is outside the range of the Int64 type."
// The example displays the following output:
// Converted the UInt16 value 0 to the Int64 value 0.
// Converted the UInt16 value 121 to the Int64 value 121.
// Converted the UInt16 value 340 to the Int64 value 340.
// Converted the UInt16 value 65535 to the Int64 value 65535.
Dim numbers() As UShort = { UInt16.MinValue, 121, 340, UInt16.MaxValue }
Dim result As Long
For Each number As UShort In numbers
Try
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", _
number.GetType().Name, number)
End Try
Next
' The example displays the following output:
' Converted the UInt16 value 0 to the Int64 value 0.
' Converted the UInt16 value 121 to the Int64 value 121.
' Converted the UInt16 value 340 to the Int64 value 340.
' Converted the UInt16 value 65535 to the Int64 value 65535.
Aplica-se a
ToInt64(String)
Converte a representação da cadeia especificada de um número num inteiro assinado equivalente de 64 bits.
public:
static long ToInt64(System::String ^ value);public static long ToInt64(string value);static member ToInt64 : string -> int64Public Shared Function ToInt64 (value As String) As LongParâmetros
- value
- String
Uma cadeia que contém um número a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente ao número em value, ou 0 (zero) se value for null.
Exceções
value não consiste num sinal opcional seguido de uma sequência de dígitos (0 a 9).
value representa um número menor que Int64.ValorMinuto ou superior a Int64.ValorMáximo.
Exemplos
O exemplo seguinte tenta converter cada elemento de um array de cadeias numéricas num inteiro longo.
string[] values = { "One", "1.34e28", "-26.87", "-18", "-6.00",
" 0", "137", "1601.9", Int32.MaxValue.ToString() };
long result;
foreach (string value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
value.GetType().Name, value, result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.", value);
}
catch (FormatException) {
Console.WriteLine("The {0} value '{1}' is not in a recognizable format.",
value.GetType().Name, value);
}
}
// The example displays the following output:
// The String value 'One' is not in a recognizable format.
// The String value '1.34e28' is not in a recognizable format.
// The String value '-26.87' is not in a recognizable format.
// Converted the String value '-18' to the Int64 value -18.
// The String value '-6.00' is not in a recognizable format.
// Converted the String value ' 0' to the Int64 value 0.
// Converted the String value '137' to the Int64 value 137.
// The String value '1601.9' is not in a recognizable format.
// Converted the String value '2147483647' to the Int64 value 2147483647.
let values =
[| "One"; "1.34e28"; "-26.87"; "-18"; "-6.00"
" 0"; "137"; "1601.9"; string Int32.MaxValue |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
with
| :? OverflowException ->
printfn $"{value} is outside the range of the Int64 type."
| :? FormatException ->
printfn $"The {value.GetType().Name} value '{value}' is not in a recognizable format."
// The example displays the following output:
// The String value 'One' is not in a recognizable format.
// The String value '1.34e28' is not in a recognizable format.
// The String value '-26.87' is not in a recognizable format.
// Converted the String value '-18' to the Int64 value -18.
// The String value '-6.00' is not in a recognizable format.
// Converted the String value ' 0' to the Int64 value 0.
// Converted the String value '137' to the Int64 value 137.
// The String value '1601.9' is not in a recognizable format.
// Converted the String value '2147483647' to the Int64 value 2147483647.
Dim values() As String = { "One", "1.34e28", "-26.87", "-18", "-6.00", _
" 0", "137", "1601.9", Int32.MaxValue.ToString() }
Dim result As Long
For Each value As String In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
value.GetType().Name, value, result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", value)
Catch e As FormatException
Console.WriteLine("The {0} value '{1}' is not in a recognizable format.", _
value.GetType().Name, value)
End Try
Next
' The example displays the following output:
' The String value 'One' is not in a recognizable format.
' The String value '1.34e28' is not in a recognizable format.
' The String value '-26.87' is not in a recognizable format.
' Converted the String value '-18' to the Int64 value -18.
' The String value '-6.00' is not in a recognizable format.
' Converted the String value ' 0' to the Int64 value 0.
' Converted the String value '137' to the Int64 value 137.
' The String value '1601.9' is not in a recognizable format.
' Converted the String value '2147483647' to the Int64 value 2147483647.
Observações
Usar o ToInt64(String) método equivale a passar value para o Int64.Parse(String) método.
value é interpretado usando as convenções de formatação da cultura atual.
Se preferir não tratar uma exceção caso a conversão falhe, pode chamar o Int64.TryParse método em vez disso. Devolve um Boolean valor que indica se a conversão teve sucesso ou falhou.
Aplica-se a
ToInt64(SByte)
Importante
Esta API não está em conformidade com CLS.
Converte o valor do inteiro com sinal especificado de 8 bits para o equivalente inteiro com sinal de 64 bits.
public:
static long ToInt64(System::SByte value);[System.CLSCompliant(false)]
public static long ToInt64(sbyte value);[<System.CLSCompliant(false)>]
static member ToInt64 : sbyte -> int64Public Shared Function ToInt64 (value As SByte) As LongParâmetros
- value
- SByte
O inteiro com sinal de 8 bits a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente a value.
- Atributos
Exemplos
O exemplo seguinte converte cada elemento de um array de bytes assinados num inteiro longo.
sbyte[] numbers = { SByte.MinValue, -1, 0, 10, SByte.MaxValue };
long result;
foreach (sbyte number in numbers)
{
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the SByte value -128 to the Int64 value -128.
// Converted the SByte value -1 to the Int64 value -1.
// Converted the SByte value 0 to the Int64 value 0.
// Converted the SByte value 10 to the Int64 value 10.
// Converted the SByte value 127 to the Int64 value 127.
let numbers =
[| SByte.MinValue; -1y; 0y; 10y; SByte.MaxValue |]
for number in numbers do
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
// Converted the SByte value -128 to the Int64 value -128.
// Converted the SByte value -1 to the Int64 value -1.
// Converted the SByte value 0 to the Int64 value 0.
// Converted the SByte value 10 to the Int64 value 10.
// Converted the SByte value 127 to the Int64 value 127.
Dim numbers() As SByte = { SByte.MinValue, -1, 0, 10, SByte.MaxValue }
Dim result As Long
For Each number As SByte In numbers
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the SByte value -128 to the Int64 value -128.
' Converted the SByte value -1 to the Int64 value -1.
' Converted the SByte value 0 to the Int64 value 0.
' Converted the SByte value 10 to the Int64 value 10.
' Converted the SByte value 127 to the Int64 value 127.
Aplica-se a
ToInt64(Object)
Converte o valor do objeto especificado para um inteiro assinado de 64 bits.
public:
static long ToInt64(System::Object ^ value);public static long ToInt64(object value);static member ToInt64 : obj -> int64Public Shared Function ToInt64 (value As Object) As LongParâmetros
- value
- Object
Um objeto que implementa a IConvertible interface, ou null.
Devoluções
Um inteiro com sinal de 64 bits equivalente a value, ou zero se value for null.
Exceções
value não está num formato apropriado.
value representa um número menor que Int64.ValorMinuto ou superior a Int64.ValorMáximo.
Exemplos
O exemplo seguinte tenta converter cada elemento de um array de objetos num inteiro longo.
object[] values = { true, -12, 163, 935, 'x', new DateTime(2009, 5, 12),
"104", "103.0", "-1",
"1.00e2", "One", 1.00e2, 16.3e42};
long result;
foreach (object value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
value.GetType().Name, value,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.",
value.GetType().Name, value);
}
catch (FormatException) {
Console.WriteLine("The {0} value {1} is not in a recognizable format.",
value.GetType().Name, value);
}
catch (InvalidCastException) {
Console.WriteLine("No conversion to an Int64 exists for the {0} value {1}.",
value.GetType().Name, value);
}
}
// The example displays the following output:
// Converted the Boolean value True to the Int64 value 1.
// Converted the Int32 value -12 to the Int64 value -12.
// Converted the Int32 value 163 to the Int64 value 163.
// Converted the Int32 value 935 to the Int64 value 935.
// Converted the Char value x to the Int64 value 120.
// No conversion to an Int64 exists for the DateTime value 5/12/2009 12:00:00 AM.
// Converted the String value 104 to the Int64 value 104.
// The String value 103.0 is not in a recognizable format.
// Converted the String value -1 to the Int64 value -1.
// The String value 1.00e2 is not in a recognizable format.
// The String value One is not in a recognizable format.
// Converted the Double value 100 to the Int64 value 100.
// The Double value 1.63E+43 is outside the range of the Int64 type.
let values: obj[] =
[| true; -12; 163; 935; 'x'; DateTime(2009, 5, 12)
"104"; "103.0"; "-1"
"1.00e2"; "One"; 1.00e2; 16.3e42 |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
with
| :? OverflowException ->
printfn $"The {value.GetType().Name} value {value} is outside the range of the Int64 type."
| :? FormatException ->
printfn $"The {value.GetType().Name} value {value} is not in a recognizable format."
| :? InvalidCastException ->
printfn $"No conversion to an Int64 exists for the {value.GetType().Name} value {value}."
// The example displays the following output:
// Converted the Boolean value True to the Int64 value 1.
// Converted the Int32 value -12 to the Int64 value -12.
// Converted the Int32 value 163 to the Int64 value 163.
// Converted the Int32 value 935 to the Int64 value 935.
// Converted the Char value x to the Int64 value 120.
// No conversion to an Int64 exists for the DateTime value 5/12/2009 12:00:00 AM.
// Converted the String value 104 to the Int64 value 104.
// The String value 103.0 is not in a recognizable format.
// Converted the String value -1 to the Int64 value -1.
// The String value 1.00e2 is not in a recognizable format.
// The String value One is not in a recognizable format.
// Converted the Double value 100 to the Int64 value 100.
// The Double value 1.63E+43 is outside the range of the Int64 type.
Dim values() As Object = { True, -12, 163, 935, "x"c, #5/12/2009#, _
"104", "103.0", "-1", _
"1.00e2", "One", 1.00e2, 16.3e42}
Dim result As Long
For Each value As Object In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
value.GetType().Name, value, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", _
value.GetType().Name, value)
Catch e As FormatException
Console.WriteLine("The {0} value {1} is not in a recognizable format.", _
value.GetType().Name, value)
Catch e As InvalidCastException
Console.WriteLine("No conversion to an Int64 exists for the {0} value {1}.", _
value.GetType().Name, value)
End Try
Next
' The example displays the following output:
' Converted the Boolean value True to the Int64 value 1.
' Converted the Int64 value -12 to the Int64 value -12.
' Converted the Int64 value 163 to the Int64 value 163.
' Converted the Int64 value 935 to the Int64 value 935.
' Converted the Char value x to the Int64 value 120.
' No conversion to an Int64 exists for the DateTime value 5/12/2009 12:00:00 AM.
' Converted the String value 104 to the Int64 value 104.
' The String value 103.0 is not in a recognizable format.
' Converted the String value -1 to the Int64 value -1.
' The String value 1.00e2 is not in a recognizable format.
' The String value One is not in a recognizable format.
' Converted the Double value 100 to the Int64 value 100.
' The Double value 1.63E+43 is outside the range of the Int64 type.
Observações
Se value não for , este método envolve uma chamada para a IConvertible.ToInt64 implementação do tipo subjacente de valuenull.
Aplica-se a
ToInt64(Int64)
Devolve o inteiro com sinal especificado de 64 bits; não é realizada nenhuma conversão real.
public:
static long ToInt64(long value);public static long ToInt64(long value);static member ToInt64 : int64 -> int64Public Shared Function ToInt64 (value As Long) As LongParâmetros
- value
- Int64
Um inteiro assinado de 64 bits.
Devoluções
value é devolvido sem alterações.
Exemplos
O exemplo seguinte converte cada elemento de um array de inteiros num inteiro longo.
int[] numbers = { Int32.MinValue, -1, 0, 121, 340, Int32.MaxValue };
long result;
foreach (int number in numbers)
{
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the Int32 value -2147483648 to the Int64 value -2147483648.
// Converted the Int32 value -1 to the Int64 value -1.
// Converted the Int32 value 0 to the Int64 value 0.
// Converted the Int32 value 121 to the Int64 value 121.
// Converted the Int32 value 340 to the Int64 value 340.
// Converted the Int32 value 2147483647 to the Int64 value 2147483647.
let numbers =
[| Int32.MinValue; -1; 0; 121; 340; Int32.MaxValue |]
for number in numbers do
try
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"The {number.GetType().Name} value {number} is outside the range of the Int64 type."
// The example displays the following output:
// The Int64 value -9223372036854775808 is outside the range of the Int64 type.
// Converted the Int32 value -1 to the Int64 value -1.
// Converted the Int32 value 0 to the Int64 value 0.
// Converted the Int32 value 121 to the Int64 value 121.
// Converted the Int32 value 340 to the Int64 value 340.
// The Int64 value 9223372036854775807 is outside the range of the Int64 type.
Dim numbers() As Integer = { Int32.MinValue, -1, 0, 121, 340, Int32.MaxValue }
Dim result As Long
For Each number As Integer In numbers
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the Int32 value -2147483648 to the Int64 value -2147483648.
' Converted the Int32 value -1 to the Int64 value -1.
' Converted the Int32 value 0 to the Int64 value 0.
' Converted the Int32 value 121 to the Int64 value 121.
' Converted the Int32 value 340 to the Int64 value 340.
' Converted the Int32 value 2147483647 to the Int64 value 2147483647.
Aplica-se a
ToInt64(Byte)
Converte o valor do inteiro não assinado especificado de 8 bits para o equivalente inteiro com sinal de 64 bits.
public:
static long ToInt64(System::Byte value);public static long ToInt64(byte value);static member ToInt64 : byte -> int64Public Shared Function ToInt64 (value As Byte) As LongParâmetros
- value
- Byte
O inteiro sem sinal de 8 bits a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente a value.
Exemplos
O exemplo seguinte converte cada elemento de um array de bytes num inteiro longo.
byte[] bytes = { Byte.MinValue, 14, 122, Byte.MaxValue};
long result;
foreach (byte byteValue in bytes)
{
result = Convert.ToInt64(byteValue);
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
byteValue.GetType().Name, byteValue,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the Byte value 0 to the Int64 value 0.
// Converted the Byte value 14 to the Int64 value 14.
// Converted the Byte value 122 to the Int64 value 122.
// Converted the Byte value 255 to the Int64 value 255.
let bytes =
[| Byte.MinValue; 14uy; 122uy; Byte.MaxValue |]
for byteValue in bytes do
let result = Convert.ToInt64 byteValue
printfn $"Converted the {byteValue.GetType().Name} value {byteValue} to the {result.GetType().Name} value {result}."
// The example displays the following output:
// Converted the Byte value 0 to the Int64 value 0.
// Converted the Byte value 14 to the Int64 value 14.
// Converted the Byte value 122 to the Int64 value 122.
// Converted the Byte value 255 to the Int64 value 255.
Dim bytes() As Byte = { Byte.MinValue, 14, 122, Byte.MaxValue}
Dim result As Long
For Each byteValue As Byte In bytes
result = Convert.ToInt64(byteValue)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
byteValue.GetType().Name, byteValue, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the Byte value 0 to the Int64 value 0.
' Converted the Byte value 14 to the Int64 value 14.
' Converted the Byte value 122 to the Int64 value 122.
' Converted the Byte value 255 to the Int64 value 255.
Aplica-se a
ToInt64(Char)
Converte o valor do carácter Unicode especificado para o inteiro assinado equivalente de 64 bits.
public:
static long ToInt64(char value);public static long ToInt64(char value);static member ToInt64 : char -> int64Public Shared Function ToInt64 (value As Char) As LongParâmetros
- value
- Char
O carácter Unicode a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente a value.
Exemplos
O exemplo seguinte converte cada elemento de um Char array num inteiro longo.
char[] chars = { 'a', 'z', '\u0007', '\u03FF',
'\u7FFF', '\uFFFE' };
long result;
foreach (char ch in chars)
{
result = Convert.ToInt64(ch);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
ch.GetType().Name, ch,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the Char value 'a' to the Int64 value 97.
// Converted the Char value 'z' to the Int64 value 122.
// Converted the Char value '' to the Int64 value 7.
// Converted the Char value 'Ͽ' to the Int64 value 1023.
// Converted the Char value '翿' to the Int64 value 32767.
// Converted the Char value '' to the Int64 value 65534.
let chars =
[| 'a'; 'z'; '\u0007'; '\u03FF'; '\u7FFF'; '\uFFFE' |]
for ch in chars do
try
let result = Convert.ToInt64 ch
printfn $"Converted the {ch.GetType().Name} value '{ch}' to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"Unable to convert u+{int ch:X4} to an Int32."
// The example displays the following output:
// Converted the Char value 'a' to the Int64 value 97.
// Converted the Char value 'z' to the Int64 value 122.
// Converted the Char value '' to the Int64 value 7.
// Converted the Char value 'Ͽ' to the Int64 value 1023.
// Converted the Char value '翿' to the Int64 value 32767.
// Converted the Char value '' to the Int64 value 65534.
Dim chars() As Char = { "a"c, "z"c, ChrW(7), ChrW(1023), _
ChrW(Short.MaxValue), ChrW(&hFFFE) }
Dim result As Long
For Each ch As Char in chars
result = Convert.ToInt64(ch)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
ch.GetType().Name, ch, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the Char value 'a' to the Int64 value 97.
' Converted the Char value 'z' to the Int64 value 122.
' Converted the Char value '' to the Int64 value 7.
' Converted the Char value 'Ͽ' to the Int64 value 1023.
' Converted the Char value '翿' to the Int64 value 32767.
' Converted the Char value '' to the Int64 value 65534.
Aplica-se a
ToInt64(DateTime)
Chamar este método gera sempre .InvalidCastException
public:
static long ToInt64(DateTime value);public static long ToInt64(DateTime value);static member ToInt64 : DateTime -> int64Public Shared Function ToInt64 (value As DateTime) As LongParâmetros
- value
- DateTime
O valor da data e hora a converter.
Devoluções
Esta conversão não é suportada. Nenhum valor é devolvido.
Exceções
Esta conversão não é suportada.
Aplica-se a
ToInt64(Boolean)
Converte o valor booleano especificado para o equivalente inteiro assinado de 64 bits.
public:
static long ToInt64(bool value);public static long ToInt64(bool value);static member ToInt64 : bool -> int64Public Shared Function ToInt64 (value As Boolean) As LongParâmetros
- value
- Boolean
O valor booleano a converter.
Devoluções
O número 1 se value é true; caso contrário, 0.
Exemplos
O exemplo seguinte converte os Boolean valores true e false para inteiros longos.
bool falseFlag = false;
bool trueFlag = true;
Console.WriteLine("{0} converts to {1}.", falseFlag,
Convert.ToInt64(falseFlag));
Console.WriteLine("{0} converts to {1}.", trueFlag,
Convert.ToInt64(trueFlag));
// The example displays the following output:
// False converts to 0.
// True converts to 1.
let falseFlag = false
let trueFlag = true
printfn $"{falseFlag} converts to {Convert.ToInt64 falseFlag}."
printfn $"{trueFlag} converts to {Convert.ToInt64 trueFlag}."
// The example displays the following output:
// False converts to 0.
// True converts to 1.
Dim falseFlag As Boolean = False
Dim trueFlag As Boolean = True
Console.WriteLine("{0} converts to {1}.", falseFlag, _
Convert.ToInt64(falseFlag))
Console.WriteLine("{0} converts to {1}.", trueFlag, _
Convert.ToInt64(trueFlag))
' The example displays the following output:
' False converts to 0.
' True converts to 1.
Aplica-se a
ToInt64(Double)
Converte o valor do número de ponto flutuante de dupla precisão especificado para um inteiro assinado equivalente de 64 bits.
public:
static long ToInt64(double value);public static long ToInt64(double value);static member ToInt64 : double -> int64Public Shared Function ToInt64 (value As Double) As LongParâmetros
- value
- Double
O número de ponto flutuante de dupla precisão a converter.
Devoluções
value, arredondado para o inteiro assinado de 64 bits mais próximo. Se value estiver a meio caminho entre dois números inteiros, o número par é devolvido; ou seja, 4,5 é convertido em 4, e 5,5 é convertido em 6.
Exceções
value é maior que Int64.MaxValue ou menor que Int64.MinValue.
Exemplos
O exemplo seguinte tenta converter cada elemento de um array de Double valores para um inteiro longo.
double[] values= { Double.MinValue, -1.38e10, -1023.299, -12.98,
0, 9.113e-16, 103.919, 17834.191, Double.MaxValue };
long result;
foreach (double value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
value.GetType().Name, value,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.", value);
}
}
// -1.7976931348623157E+308 is outside the range of the Int64 type.
// Converted the Double value '-13800000000' to the Int64 value -13800000000.
// Converted the Double value '-1023.299' to the Int64 value -1023.
// Converted the Double value '-12.98' to the Int64 value -13.
// Converted the Double value '0' to the Int64 value 0.
// Converted the Double value '9.113E-16' to the Int64 value 0.
// Converted the Double value '103.919' to the Int64 value 104.
// Converted the Double value '17834.191' to the Int64 value 17834.
// 1.7976931348623157E+308 is outside the range of the Int64 type.
let values =
[| Double.MinValue; -1.38e10; -1023.299; -12.98
0; 9.113e-16; 103.919; 17834.191; Double.MaxValue |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"{value} is outside the range of the Int64 type."
// -1.79769313486232E+308 is outside the range of the Int64 type.
// -13800000000 is outside the range of the Int64 type.
// Converted the Double value '-1023.299' to the Int64 value -1023.
// Converted the Double value '-12.98' to the Int64 value -13.
// Converted the Double value '0' to the Int64 value 0.
// Converted the Double value '9.113E-16' to the Int64 value 0.
// Converted the Double value '103.919' to the Int64 value 104.
// Converted the Double value '17834.191' to the Int64 value 17834.
// 1.79769313486232E+308 is outside the range of the Int64 type.
Dim values() As Double = { Double.MinValue, -1.38e10, -1023.299, -12.98, _
0, 9.113e-16, 103.919, 17834.191, Double.MaxValue }
Dim result As Long
For Each value As Double In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
value.GetType().Name, value, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", value)
End Try
Next
' -1.79769313486232E+308 is outside the range of the Int64 type.
' Converted the Double value '-13800000000' to the Int64 value -13800000000.
' Converted the Double value '-1023.299' to the Int64 value -1023.
' Converted the Double value '-12.98' to the Int64 value -13.
' Converted the Double value '0' to the Int64 value 0.
' Converted the Double value '9.113E-16' to the Int64 value 0.
' Converted the Double value '103.919' to the Int64 value 104.
' Converted the Double value '17834.191' to the Int64 value 17834.
' 1.79769313486232E+308 is outside the range of the Int64 type.
Ver também
Aplica-se a
ToInt64(Int16)
Converte o valor do inteiro assinado especificado de 16 bits para um inteiro assinado equivalente de 64 bits.
public:
static long ToInt64(short value);public static long ToInt64(short value);static member ToInt64 : int16 -> int64Public Shared Function ToInt64 (value As Short) As LongParâmetros
- value
- Int16
O inteiro assinado de 16 bits a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente a value.
Exemplos
O exemplo seguinte converte cada elemento de um array de inteiros de 16 bits num inteiro longo.
short[] numbers= { Int16.MinValue, -1, 0, 121, 340, Int16.MaxValue };
long result;
foreach (short number in numbers)
{
result = Convert.ToInt64(number);
Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.",
number.GetType().Name, number,
result.GetType().Name, result);
}
// The example displays the following output:
// Converted the Int16 value -32768 to a Int32 value -32768.
// Converted the Int16 value -1 to a Int32 value -1.
// Converted the Int16 value 0 to a Int32 value 0.
// Converted the Int16 value 121 to a Int32 value 121.
// Converted the Int16 value 340 to a Int32 value 340.
// Converted the Int16 value 32767 to a Int32 value 32767.
let numbers =
[| Int16.MinValue; -1s; 0s; 121s; 340s; Int16.MaxValue |]
for number in numbers do
let result = Convert.ToInt64 number
printfn $"Converted the {number.GetType().Name} value {number} to a {result.GetType().Name} value {result}."
// The example displays the following output:
// Converted the Int16 value -32768 to a Int64 value -32768.
// Converted the Int16 value -1 to a Int64 value -1.
// Converted the Int16 value 0 to a Int64 value 0.
// Converted the Int16 value 121 to a Int64 value 121.
// Converted the Int16 value 340 to a Int64 value 340.
// Converted the Int16 value 32767 to a Int64 value 32767.
Dim numbers() As Short = { Int16.MinValue, -1, 0, 121, 340, Int16.MaxValue }
Dim result As Long
For Each number As Short In numbers
result = Convert.ToInt64(number)
Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
number.GetType().Name, number, _
result.GetType().Name, result)
Next
' The example displays the following output:
' Converted the Int16 value -32768 to the Int64 value -32768.
' Converted the Int16 value -1 to the Int64 value -1.
' Converted the Int16 value 0 to the Int64 value 0.
' Converted the Int16 value 121 to the Int64 value 121.
' Converted the Int16 value 340 to the Int64 value 340.
' Converted the Int16 value 32767 to the Int64 value 32767.
Aplica-se a
ToInt64(Int32)
Converte o valor do inteiro assinado especificado de 32 bits para um inteiro assinado equivalente de 64 bits.
public:
static long ToInt64(int value);public static long ToInt64(int value);static member ToInt64 : int -> int64Public Shared Function ToInt64 (value As Integer) As LongParâmetros
- value
- Int32
O inteiro assinado de 32 bits a converter.
Devoluções
Um inteiro com sinal de 64 bits que é equivalente a value.
Aplica-se a
ToInt64(Decimal)
Converte o valor do número decimal especificado para um inteiro assinado equivalente de 64 bits.
public:
static long ToInt64(System::Decimal value);public static long ToInt64(decimal value);static member ToInt64 : decimal -> int64Public Shared Function ToInt64 (value As Decimal) As LongParâmetros
- value
- Decimal
O número decimal a converter.
Devoluções
value, arredondado para o inteiro assinado de 64 bits mais próximo. Se value estiver a meio caminho entre dois números inteiros, o número par é devolvido; ou seja, 4,5 é convertido em 4, e 5,5 é convertido em 6.
Exceções
value é maior que Int64.MaxValue ou menor que Int64.MinValue.
Exemplos
O exemplo seguinte tenta converter cada elemento de um array de Decimal valores para um inteiro longo.
decimal[] values= { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
199.55m, 9214.16m, Decimal.MaxValue };
long result;
foreach (decimal value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
value.GetType().Name, value,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.",
value);
}
}
// The example displays the following output:
// -79228162514264337593543950335 is outside the range of the Int64 type.
// Converted the Decimal value '-1034.23' to the Int64 value -1034.
// Converted the Decimal value '-12' to the Int64 value -12.
// Converted the Decimal value '0' to the Int64 value 0.
// Converted the Decimal value '147' to the Int64 value 147.
// Converted the Decimal value '199.55' to the Int64 value 200.
// Converted the Decimal value '9214.16' to the Int64 value 9214.
// 79228162514264337593543950335 is outside the range of the Int64 type.
let values =
[| Decimal.MinValue; -1034.23m; -12m; 0m; 147m
199.55m; 9214.16m; Decimal.MaxValue |]
for value in values do
try
let result = Convert.ToInt64 value
printfn $"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"{value} is outside the range of the Int64 type."
// The example displays the following output:
// -79228162514264337593543950335 is outside the range of the Int64 type.
// Converted the Decimal value '-1034.23' to the Int64 value -1034.
// Converted the Decimal value '-12' to the Int64 value -12.
// Converted the Decimal value '0' to the Int64 value 0.
// Converted the Decimal value '147' to the Int64 value 147.
// Converted the Decimal value '199.55' to the Int64 value 200.
// Converted the Decimal value '9214.16' to the Int64 value 9214.
// 79228162514264337593543950335 is outside the range of the Int64 type.
Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
199.55d, 9214.16d, Decimal.MaxValue }
Dim result As Long
For Each value As Decimal In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
value.GetType().Name, value, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", _
value)
End Try
Next
' The example displays the following output:
' -79228162514264337593543950335 is outside the range of the Int64 type.
' Converted the Decimal value '-1034.23' to the Int64 value -1034.
' Converted the Decimal value '-12' to the Int64 value -12.
' Converted the Decimal value '0' to the Int64 value 0.
' Converted the Decimal value '147' to the Int64 value 147.
' Converted the Decimal value '199.55' to the Int64 value 200.
' Converted the Decimal value '9214.16' to the Int64 value 9214.
' 79228162514264337593543950335 is outside the range of the Int64 type.