BitConverter.ToInt64 Méthode

Définition

Espace de noms:
System
Assemblys:
netstandard.dll, System.Runtime.dll
Assembly:
System.Runtime.Extensions.dll
Assembly:
netstandard.dll
Assemblys:
mscorlib.dll, System.Runtime.Extensions.dll
Assembly:
mscorlib.dll

Surcharges

Nom Description
ToInt64(ReadOnlySpan<Byte>)

Convertit une étendue d’octets en lecture seule en entier signé 64 bits.
ToInt64(Byte[], Int32)

Retourne un entier signé 64 bits converti à partir de huit octets à une position spécifiée dans un tableau d’octets.

ToInt64(ReadOnlySpan<Byte>)

Source:
BitConverter.cs
Source:
BitConverter.cs
Source:
BitConverter.cs
Source:
BitConverter.cs
Source:
BitConverter.cs

Convertit une étendue d’octets en lecture seule en entier signé 64 bits.

public:
 static long ToInt64(ReadOnlySpan<System::Byte> value);
public static long ToInt64(ReadOnlySpan<byte> value);
static member ToInt64 : ReadOnlySpan<byte> -> int64
Public Shared Function ToInt64 (value As ReadOnlySpan(Of Byte)) As Long

Paramètres

value
ReadOnlySpan<Byte>

Étendue en lecture seule contenant les octets à convertir.

Retours

Int64

Entier signé 64 bits représentant les octets convertis.

Exceptions

ArgumentOutOfRangeException

La longueur est value inférieure à 8.

S’applique à

ToInt64(Byte[], Int32)

Source:
BitConverter.cs
Source:
BitConverter.cs
Source:
BitConverter.cs
Source:
BitConverter.cs
Source:
BitConverter.cs

Retourne un entier signé 64 bits converti à partir de huit octets à une position spécifiée dans un tableau d’octets.

public:
 static long ToInt64(cli::array <System::Byte> ^ value, int startIndex);
public static long ToInt64(byte[] value, int startIndex);
static member ToInt64 : byte[] * int -> int64
Public Shared Function ToInt64 (value As Byte(), startIndex As Integer) As Long

Paramètres

value
Byte[]

Tableau d’octets qui inclut les huit octets à convertir.

startIndex
Int32

Position de départ dans value.

Retours

Int64

Entier signé 64 bits formé par huit octets commençant à startIndex.

Exceptions

ArgumentException

startIndex est supérieur ou égal à la longueur de value moins 7, et est inférieur ou égal à la longueur de value moins 1.

ArgumentNullException

value a la valeur null.

ArgumentOutOfRangeException

startIndex est inférieur à zéro ou supérieur à la longueur de value moins 1.

Exemples

L’exemple de code suivant convertit les éléments de Byte tableaux en Int64 valeurs avec la ToInt64 méthode.

// Example of the BitConverter.ToInt64 method.
using System;

class BytesToInt64Demo
{
    const string formatter = "{0,5}{1,27}{2,24}";

    // Convert eight byte array elements to a long and display it.
    public static void BAToInt64( byte[ ] bytes, int index )
    {
        long value = BitConverter.ToInt64( bytes, index );

        Console.WriteLine( formatter, index,
            BitConverter.ToString( bytes, index, 8 ), value );
    }

    // Display a byte array, using multiple lines if necessary.
    public static void WriteMultiLineByteArray( byte[ ] bytes )
    {
        const int rowSize = 20;
        int iter;

        Console.WriteLine( "initial byte array" );
        Console.WriteLine( "------------------" );

        for( iter = 0; iter < bytes.Length - rowSize; iter += rowSize )
        {
            Console.Write(
                BitConverter.ToString( bytes, iter, rowSize ) );
            Console.WriteLine( "-" );
        }

        Console.WriteLine( BitConverter.ToString( bytes, iter ) );
        Console.WriteLine( );
    }

    public static void Main( )
    {
        byte[ ] byteArray = {
              0,  54, 101, 196, 255, 255, 255, 255,   0,   0,
              0,   0,   0,   0,   0,   0, 128,   0, 202, 154,
             59,   0,   0,   0,   0,   1,   0,   0,   0,   0,
            255, 255, 255, 255,   1,   0,   0, 255, 255, 255,
            255, 255, 255, 255, 127,  86,  85,  85,  85,  85,
             85, 255, 255, 170, 170, 170, 170, 170, 170,   0,
              0, 100, 167, 179, 182, 224,  13,   0,   0, 156,
             88,  76,  73,  31, 242 };

        Console.WriteLine(
            "This example of the BitConverter.ToInt64( byte[ ], " +
            "int ) \nmethod generates the following output. It " +
            "converts elements \nof a byte array to long values.\r\n" );

        WriteMultiLineByteArray( byteArray );

        Console.WriteLine( formatter, "index", "array elements", "long" );
        Console.WriteLine( formatter, "-----", "--------------", "----" );

        // Convert byte array elements to long values.
        BAToInt64( byteArray, 8 );
        BAToInt64( byteArray, 5 );
        BAToInt64( byteArray, 34 );
        BAToInt64( byteArray, 17 );
        BAToInt64( byteArray, 0 );
        BAToInt64( byteArray, 21 );
        BAToInt64( byteArray, 26 );
        BAToInt64( byteArray, 53 );
        BAToInt64( byteArray, 45 );
        BAToInt64( byteArray, 59 );
        BAToInt64( byteArray, 67 );
        BAToInt64( byteArray, 37 );
        BAToInt64( byteArray, 9 );
    }
}

/*
This example of the BitConverter.ToInt64( byte[ ], int )
method generates the following output. It converts elements
of a byte array to long values.

initial byte array
------------------
00-36-65-C4-FF-FF-FF-FF-00-00-00-00-00-00-00-00-80-00-CA-9A-
3B-00-00-00-00-01-00-00-00-00-FF-FF-FF-FF-01-00-00-FF-FF-FF-
FF-FF-FF-FF-7F-56-55-55-55-55-55-FF-FF-AA-AA-AA-AA-AA-AA-00-
00-64-A7-B3-B6-E0-0D-00-00-9C-58-4C-49-1F-F2

index             array elements                    long
-----             --------------                    ----
    8    00-00-00-00-00-00-00-00                       0
    5    FF-FF-FF-00-00-00-00-00                16777215
   34    01-00-00-FF-FF-FF-FF-FF               -16777215
   17    00-CA-9A-3B-00-00-00-00              1000000000
    0    00-36-65-C4-FF-FF-FF-FF             -1000000000
   21    00-00-00-00-01-00-00-00              4294967296
   26    00-00-00-00-FF-FF-FF-FF             -4294967296
   53    AA-AA-AA-AA-AA-AA-00-00         187649984473770
   45    56-55-55-55-55-55-FF-FF        -187649984473770
   59    00-00-64-A7-B3-B6-E0-0D     1000000000000000000
   67    00-00-9C-58-4C-49-1F-F2    -1000000000000000000
   37    FF-FF-FF-FF-FF-FF-FF-7F     9223372036854775807
    9    00-00-00-00-00-00-00-80    -9223372036854775808
*/

open System

let print obj1 obj2 obj3 = printfn $"{obj1,5}{obj2,27}{obj3,24}"

// Convert eight byte array elements to a long and display it.
let BAToInt64 bytes index =
    let value = BitConverter.ToInt64(bytes, index)

    print index (BitConverter.ToString(bytes, index, 8)) value

// Display a byte array, using multiple lines if necessary.
let writeMultiLineByteArray (bytes: byte []) =
    let rowSize = 20

    printfn "initial byte array"
    printfn "------------------"

    let mutable iter = 0
    for i in 0 .. rowSize .. (bytes.Length - rowSize - 1) do
        printfn $"{BitConverter.ToString(bytes, i, rowSize)}-"
        iter <- i
    printfn $"{BitConverter.ToString(bytes, iter + rowSize)}"

let byteArray =
    [| 0uy; 54uy; 101uy; 196uy; 255uy; 255uy; 255uy; 255uy; 0uy; 0uy
       0uy; 0uy; 0uy; 0uy; 0uy; 0uy; 128uy; 0uy; 202uy; 154uy
       59uy; 0uy; 0uy; 0uy; 0uy; 1uy; 0uy; 0uy; 0uy; 0uy
       255uy; 255uy; 255uy; 255uy; 1uy; 0uy; 0uy; 255uy; 255uy; 255uy
       255uy; 255uy; 255uy; 255uy; 127uy; 86uy; 85uy; 85uy; 85uy; 85uy
       85uy; 255uy; 255uy; 170uy; 170uy; 170uy; 170uy; 170uy; 170uy; 0uy
       0uy; 100uy; 167uy; 179uy; 182uy; 224uy; 13uy; 0uy; 0uy; 156uy
       88uy; 76uy; 73uy; 31uy; 242uy |]

printfn "This example of the BitConverter.ToInt64(byte [], int) \nmethod generates the following output. It converts elements \nof a byte array to long values.\r\n"

writeMultiLineByteArray byteArray

print "index" "array elements" "long"
print "-----" "--------------" "----"

// Convert byte array elements to long values.
BAToInt64 byteArray 8
BAToInt64 byteArray 5
BAToInt64 byteArray 34
BAToInt64 byteArray 17
BAToInt64 byteArray 0
BAToInt64 byteArray 21
BAToInt64 byteArray 26
BAToInt64 byteArray 53
BAToInt64 byteArray 45
BAToInt64 byteArray 59
BAToInt64 byteArray 67
BAToInt64 byteArray 37
BAToInt64 byteArray 9


// This example of the BitConverter.ToInt64( byte[ ], int )
// method generates the following output. It converts elements
// of a byte array to long values.
//
// initial byte array
// ------------------
// 00-36-65-C4-FF-FF-FF-FF-00-00-00-00-00-00-00-00-80-00-CA-9A-
// 3B-00-00-00-00-01-00-00-00-00-FF-FF-FF-FF-01-00-00-FF-FF-FF-
// FF-FF-FF-FF-7F-56-55-55-55-55-55-FF-FF-AA-AA-AA-AA-AA-AA-00-
// 00-64-A7-B3-B6-E0-0D-00-00-9C-58-4C-49-1F-F2
//
// index             array elements                    long
// -----             --------------                    ----
//     8    00-00-00-00-00-00-00-00                       0
//     5    FF-FF-FF-00-00-00-00-00                16777215
//    34    01-00-00-FF-FF-FF-FF-FF               -16777215
//    17    00-CA-9A-3B-00-00-00-00              1000000000
//     0    00-36-65-C4-FF-FF-FF-FF             -1000000000
//    21    00-00-00-00-01-00-00-00              4294967296
//    26    00-00-00-00-FF-FF-FF-FF             -4294967296
//    53    AA-AA-AA-AA-AA-AA-00-00         187649984473770
//    45    56-55-55-55-55-55-FF-FF        -187649984473770
//    59    00-00-64-A7-B3-B6-E0-0D     1000000000000000000
//    67    00-00-9C-58-4C-49-1F-F2    -1000000000000000000
//    37    FF-FF-FF-FF-FF-FF-FF-7F     9223372036854775807
//     9    00-00-00-00-00-00-00-80    -9223372036854775808

' Example of the BitConverter.ToInt64 method.
Module BytesToInt64Demo

    Const formatter As String = "{0,5}{1,27}{2,24}"
 
    ' Convert eight Byte array elements to a Long and display it.
    Sub BAToInt64( bytes( ) As Byte, index As Integer )

        Dim value As Long = BitConverter.ToInt64( bytes, index )

        Console.WriteLine( formatter, index, _
            BitConverter.ToString( bytes, index, 8 ), value )
    End Sub 

    ' Display a Byte array, using multiple lines if necessary.
    Sub WriteMultiLineByteArray( bytes( ) As Byte )
       
        Const rowSize As Integer = 20 
        Dim iter As Integer

        Console.WriteLine( "initial Byte array" )
        Console.WriteLine( "------------------" )

        For iter = 0 To bytes.Length - rowSize - 1 Step rowSize
            Console.Write( _
                BitConverter.ToString( bytes, iter, rowSize ) )
            Console.WriteLine( "-" )
        Next iter

        Console.WriteLine( BitConverter.ToString( bytes, iter ) )
        Console.WriteLine( )
    End Sub

    Sub Main( )
        Dim byteArray as Byte( ) = { _
              0,  54, 101, 196, 255, 255, 255, 255,   0,   0, _
              0,   0,   0,   0,   0,   0, 128,   0, 202, 154, _
             59,   0,   0,   0,   0,   1,   0,   0,   0,   0, _
            255, 255, 255, 255,   1,   0,   0, 255, 255, 255, _
            255, 255, 255, 255, 127,  86,  85,  85,  85,  85, _
             85, 255, 255, 170, 170, 170, 170, 170, 170,   0, _
              0, 100, 167, 179, 182, 224,  13,   0,   0, 156, _
             88,  76,  73,  31, 242 }

        Console.WriteLine( _
            "This example of the BitConverter.ToInt64( Byte( ), " & _
            "Integer ) " & vbCrLf & "method generates the " & _
            "following output. It converts elements " & vbCrLf & _
            "of a Byte array to Long values." & vbCrLf )

        WriteMultiLineByteArray( byteArray )

        Console.WriteLine( formatter, "index", "array elements", _
            "Long" )
        Console.WriteLine( formatter, "-----", "--------------", _
            "----" )
          
        ' Convert Byte array elements to Long values.
        BAToInt64( byteArray, 8 )
        BAToInt64( byteArray, 5 )
        BAToInt64( byteArray, 34 )
        BAToInt64( byteArray, 17 )
        BAToInt64( byteArray, 0 )
        BAToInt64( byteArray, 21 )
        BAToInt64( byteArray, 26 )
        BAToInt64( byteArray, 53 )
        BAToInt64( byteArray, 45 )
        BAToInt64( byteArray, 59 )
        BAToInt64( byteArray, 67 )
        BAToInt64( byteArray, 37 )
        BAToInt64( byteArray, 9 )
    End Sub 
End Module

' This example of the BitConverter.ToInt64( Byte( ), Integer )
' method generates the following output. It converts elements
' of a Byte array to Long values.
' 
' initial Byte array
' ------------------
' 00-36-65-C4-FF-FF-FF-FF-00-00-00-00-00-00-00-00-80-00-CA-9A-
' 3B-00-00-00-00-01-00-00-00-00-FF-FF-FF-FF-01-00-00-FF-FF-FF-
' FF-FF-FF-FF-7F-56-55-55-55-55-55-FF-FF-AA-AA-AA-AA-AA-AA-00-
' 00-64-A7-B3-B6-E0-0D-00-00-9C-58-4C-49-1F-F2
' 
' index             array elements                    Long
' -----             --------------                    ----
'     8    00-00-00-00-00-00-00-00                       0
'     5    FF-FF-FF-00-00-00-00-00                16777215
'    34    01-00-00-FF-FF-FF-FF-FF               -16777215
'    17    00-CA-9A-3B-00-00-00-00              1000000000
'     0    00-36-65-C4-FF-FF-FF-FF             -1000000000
'    21    00-00-00-00-01-00-00-00              4294967296
'    26    00-00-00-00-FF-FF-FF-FF             -4294967296
'    53    AA-AA-AA-AA-AA-AA-00-00         187649984473770
'    45    56-55-55-55-55-55-FF-FF        -187649984473770
'    59    00-00-64-A7-B3-B6-E0-0D     1000000000000000000
'    67    00-00-9C-58-4C-49-1F-F2    -1000000000000000000
'    37    FF-FF-FF-FF-FF-FF-FF-7F     9223372036854775807
'     9    00-00-00-00-00-00-00-80    -9223372036854775808

Remarques

La ToInt64 méthode convertit les octets de l’index startIndex en startIndex + 7 en Int64 valeur. L’ordre des octets dans le tableau doit refléter l’endianité de l’architecture du système informatique. Pour plus d’informations, consultez la section Notes de la BitConverter rubrique de classe.

Voir aussi

S’applique à