Decimal.ToDouble(Decimal) Methode
Definitie
Belangrijk
Bepaalde informatie heeft betrekking op een voorlopige productversie die aanzienlijk kan worden gewijzigd voordat deze wordt uitgebracht. Microsoft biedt geen enkele expliciete of impliciete garanties met betrekking tot de informatie die hier wordt verstrekt.
Converteert de waarde van de opgegeven Decimal waarde naar het equivalente drijvendekommagetal met dubbele precisie.
public:
static double ToDouble(System::Decimal d);public static double ToDouble(decimal d);static member ToDouble : decimal -> doublePublic Shared Function ToDouble (d As Decimal) As DoubleParameters
- d
- Decimal
Het decimale getal dat moet worden geconverteerd.
Retouren
Een drijvendekommagetal met dubbele precisie dat gelijk is aan d.
Voorbeelden
In het volgende codevoorbeeld worden getallen geconverteerd Decimal naar Double waarden met behulp van de ToDouble methode.
// Example of the decimal.ToSingle and decimal.ToDouble methods.
using System;
class DecimalToSgl_DblDemo
{
static string formatter = "{0,30}{1,17}{2,23}";
// Convert the decimal argument; no exceptions are thrown.
public static void DecimalToSgl_Dbl( decimal argument )
{
object SingleValue;
object DoubleValue;
// Convert the argument to a float value.
SingleValue = decimal.ToSingle( argument );
// Convert the argument to a double value.
DoubleValue = decimal.ToDouble( argument );
Console.WriteLine( formatter, argument,
SingleValue, DoubleValue );
}
public static void Main( )
{
Console.WriteLine( "This example of the \n" +
" decimal.ToSingle( decimal ) and \n" +
" decimal.ToDouble( decimal ) \nmethods " +
"generates the following output. It \ndisplays " +
"several converted decimal values.\n" );
Console.WriteLine( formatter, "decimal argument",
"float", "double" );
Console.WriteLine( formatter, "----------------",
"-----", "------" );
// Convert decimal values and display the results.
DecimalToSgl_Dbl( 0.0000000000000000000000000001M );
DecimalToSgl_Dbl( 0.0000000000123456789123456789M );
DecimalToSgl_Dbl( 123M );
DecimalToSgl_Dbl( new decimal( 123000000, 0, 0, false, 6 ) );
DecimalToSgl_Dbl( 123456789.123456789M );
DecimalToSgl_Dbl( 123456789123456789123456789M );
DecimalToSgl_Dbl( decimal.MinValue );
DecimalToSgl_Dbl( decimal.MaxValue );
}
}
/*
This example of the
decimal.ToSingle( decimal ) and
decimal.ToDouble( decimal )
methods generates the following output. It
displays several converted decimal values.
decimal argument float double
---------------- ----- ------
0.0000000000000000000000000001 1E-28 1E-28
0.0000000000123456789123456789 1.234568E-11 1.23456789123457E-11
123 123 123
123.000000 123 123
123456789.123456789 1.234568E+08 123456789.123457
123456789123456789123456789 1.234568E+26 1.23456789123457E+26
-79228162514264337593543950335 -7.922816E+28 -7.92281625142643E+28
79228162514264337593543950335 7.922816E+28 7.92281625142643E+28
*/
// Example of the Decimal.ToSingle and Decimal.ToDouble methods.
open System
let formatter obj1 obj2 obj3 = printfn $"{obj1,30}{obj2,17}{obj3,23}"
// Convert the decimal argument no exceptions are thrown.
let decimalToSgl_Dbl argument =
// Convert the argument to a float value.
let singleValue = Decimal.ToSingle argument
// Convert the argument to a double value.
let doubleValue = Decimal.ToDouble argument
formatter argument singleValue doubleValue
printfn
"""This example of the
Decimal.ToSingle( decimal ) and
Decimal.ToDouble( decimal )
methods generates the following output. It
displays several converted decimal values.
"""
formatter "decimal argument" "float" "double"
formatter "----------------" "-----" "------"
// Convert decimal values and display the results.
decimalToSgl_Dbl 0.0000000000000000000000000001M
decimalToSgl_Dbl 0.0000000000123456789123456789M
decimalToSgl_Dbl 123M
decimalToSgl_Dbl (Decimal(123000000, 0, 0, false, 6uy))
decimalToSgl_Dbl 123456789.123456789M
decimalToSgl_Dbl 123456789123456789123456789M
decimalToSgl_Dbl Decimal.MinValue
decimalToSgl_Dbl Decimal.MaxValue
// This example of the
// Decimal.ToSingle( decimal ) and
// Decimal.ToDouble( decimal )
// methods generates the following output. It
// displays several converted decimal values.
//
// decimal argument float double
// ---------------- ----- ------
// 0.0000000000000000000000000001 1E-28 1E-28
// 0.0000000000123456789123456789 1.234568E-11 1.23456789123457E-11
// 123 123 123
// 123.000000 123 123
// 123456789.123456789 1.234568E+08 123456789.123457
// 123456789123456789123456789 1.234568E+26 1.23456789123457E+26
// -79228162514264337593543950335 -7.922816E+28 -7.92281625142643E+28
// 79228162514264337593543950335 7.922816E+28 7.92281625142643E+28
' Example of the Decimal.ToSingle and Decimal.ToDouble methods.
Module DecimalToSgl_DblDemo
Dim formatter As String = "{0,30}{1,17}{2,23}"
' Convert the Decimal argument; no exceptions are thrown.
Sub DecimalToSgl_Dbl( argument As Decimal )
Dim SingleValue As Object
Dim DoubleValue As Object
' Convert the argument to a Single value.
SingleValue = Decimal.ToSingle( argument )
' Convert the argument to a Double value.
DoubleValue = Decimal.ToDouble( argument )
Console.WriteLine( formatter, argument, _
SingleValue, DoubleValue )
End Sub
Sub Main( )
Console.WriteLine( "This example of the " & vbCrLf & _
" Decimal.ToSingle( Decimal ) and " & vbCrLf & _
" Decimal.ToDouble( Decimal ) " & vbCrLf & "methods " & _
"generates the following output. It " & vbCrLf & _
"displays several converted Decimal values." & vbCrLf )
Console.WriteLine( formatter, "Decimal argument", _
"Single", "Double" )
Console.WriteLine( formatter, "----------------", _
"------", "------" )
' Convert Decimal values and display the results.
DecimalToSgl_Dbl( 0.0000000000000000000000000001D )
DecimalToSgl_Dbl( 0.0000000000112233445566778899D )
DecimalToSgl_Dbl( 123D )
DecimalToSgl_Dbl( New Decimal( 123000000, 0, 0, False, 6 ) )
DecimalToSgl_Dbl( 123456789.123456789D )
DecimalToSgl_Dbl( 123456789123456789123456789D )
DecimalToSgl_Dbl( Decimal.MinValue )
DecimalToSgl_Dbl( Decimal.MaxValue )
End Sub
End Module
' This example of the
' Decimal.ToSingle( Decimal ) and
' Decimal.ToDouble( Decimal )
' methods generates the following output. It
' displays several converted Decimal values.
'
' Decimal argument Single Double
' ---------------- ------ ------
' 0.0000000000000000000000000001 1E-28 1E-28
' 0.0000000000112233445566778899 1.122334E-11 1.12233445566779E-11
' 123 123 123
' 123.000000 123 123
' 123456789.123456789 1.234568E+08 123456789.123457
' 123456789123456789123456789 1.234568E+26 1.23456789123457E+26
' -79228162514264337593543950335 -7.922816E+28 -7.92281625142643E+28
' 79228162514264337593543950335 7.922816E+28 7.92281625142643E+28
Opmerkingen
Deze bewerking kan afrondingsfouten opleveren omdat een drijvendekommagetal met dubbele precisie minder significante cijfers heeft dan een Decimal.
U kunt een Decimal waarde ook converteren naar een Double waarde met behulp van de Explicit toewijzingsoperator. Omdat de conversie kan leiden tot een verlies van precisie, moet u een cast-operator in C# of een conversiefunctie in Visual Basic gebruiken.
