Buffer Classe

Définition

public ref class Buffer abstract sealed

public ref class Buffer sealed

public static class Buffer

public sealed class Buffer

[System.Runtime.InteropServices.ComVisible(true)]
public static class Buffer

type Buffer = class

[<System.Runtime.InteropServices.ComVisible(true)>]
type Buffer = class

Public Class Buffer

Public NotInheritable Class Buffer

Héritage

Object

Buffer

Attributs

ComVisibleAttribute

Exemples

L’exemple de code suivant illustre l’utilisation de plusieurs Buffer méthodes de classe.

// Example of the Buffer class methods.
using System;

class BufferClassDemo
{
    // Display the array elements from right to left in hexadecimal.
    public static void DisplayArray( short[ ] arr )
    {
        Console.Write( "  arr:" );
        for( int loopX = arr.Length - 1; loopX >= 0; loopX-- )
            Console.Write( " {0:X4}", arr[ loopX ] );
        Console.WriteLine( );
    }

    public static void Main( )
    {
        // This array is to be modified and displayed.
        short[ ] arr = { 258, 259, 260, 261, 262, 263, 264,
                         265, 266, 267, 268, 269, 270, 271 };

        Console.WriteLine( "This example of the Buffer class " +
            "methods generates the following output.\n" +
            "Note: The array is displayed from right to left.\n" );
        Console.WriteLine( "Initial values of array:\n" );

        // Display the initial array values and ByteLength.
        DisplayArray( arr );
        Console.WriteLine( "\nBuffer.ByteLength( arr ): {0}",
            Buffer.ByteLength( arr ) );

        // Copy a region of the array; set a byte within the array.
        Console.WriteLine( "\nCall these methods: \n" +
            "  Buffer.BlockCopy( arr, 5, arr, 16, 9 ),\n" +
            "  Buffer.SetByte( arr, 7, 170 ).\n" );

        Buffer.BlockCopy( arr, 5, arr, 16, 9 );
        Buffer.SetByte( arr, 7, 170 );

        // Display the array and a byte within the array.
        Console.WriteLine( "Final values of array:\n" );
        DisplayArray( arr );
        Console.WriteLine( "\nBuffer.GetByte( arr, 26 ): {0}",
            Buffer.GetByte( arr, 26 ) );
    }
}

/*
This example of the Buffer class methods generates the following output.
Note: The array is displayed from right to left.

Initial values of array:

  arr: 010F 010E 010D 010C 010B 010A 0109 0108 0107 0106 0105 0104 0103 0102

Buffer.ByteLength( arr ): 28

Call these methods:
  Buffer.BlockCopy( arr, 5, arr, 16, 9 ),
  Buffer.SetByte( arr, 7, 170 ).

Final values of array:

  arr: 010F 0101 0801 0701 0601 0501 0109 0108 0107 0106 AA05 0104 0103 0102

Buffer.GetByte( arr, 26 ): 15
*/

open System

// Display the array elements from right to left in hexadecimal.
let displayArray (arr: int16 []) =
    printf "  arr:"
    for i = arr.Length - 1 downto 0 do
        printf $" {arr[i]:X4}"
    printfn ""

// This array is to be modified and displayed.
let arr = 
    [| 258s; 259s; 260s; 261s; 262s; 263s; 264s
       265s; 266s; 267s; 268s; 269s; 270s; 271s |]

printfn "This example of the Buffer class methods generates the following output.\nNote: The array is displayed from right to left.\n"
printfn "Initial values of array:\n"

// Display the initial array values and ByteLength.
displayArray arr
printfn $"\nBuffer.ByteLength(arr): {Buffer.ByteLength arr}"

// Copy a region of the array; set a byte within the array.
printfn "\nCall these methods: \n  Buffer.BlockCopy(arr, 5, arr, 16, 9),\n  Buffer.SetByte(arr, 7, 170).\n"

Buffer.BlockCopy(arr, 5, arr, 16, 9)
Buffer.SetByte(arr, 7, 170uy)

// Display the array and a byte within the array.
printfn "Final values of array:\n"
displayArray arr
printfn $"\nBuffer.GetByte(arr, 26): {Buffer.GetByte(arr, 26)}"


// This example of the Buffer class methods generates the following output.
// Note: The array is displayed from right to left.
//
// Initial values of array:
//
//   arr: 010F 010E 010D 010C 010B 010A 0109 0108 0107 0106 0105 0104 0103 0102
//
// Buffer.ByteLength(arr): 28
//
// Call these methods:
//   Buffer.BlockCopy(arr, 5, arr, 16, 9),
//   Buffer.SetByte(arr, 7, 170).
//
// Final values of array:
//
//   arr: 010F 0101 0801 0701 0601 0501 0109 0108 0107 0106 AA05 0104 0103 0102
//
// Buffer.GetByte(arr, 26): 15

' Example of the Buffer class methods.
Module BufferClassDemo

    ' Display the array elements from right to left in hexadecimal.
    Sub DisplayArray( arr( ) As Short )

        Console.Write( "  arr:" )
        Dim loopX     As Integer
        For loopX = arr.Length - 1 To 0 Step -1
            Console.Write( " {0:X4}", arr( loopX ) )
        Next loopX
        Console.WriteLine( )
    End Sub

    Sub Main( )

        ' This array is to be modified and displayed.
        Dim arr( ) As Short = { 258, 259, 260, 261, 262, 263, 264, _
                                265, 266, 267, 268, 269, 270, 271 }
        Console.WriteLine( _
            "This example of the Buffer class methods generates " & _
            "the following output." & vbCrLf & "Note: The " & _
            "array is displayed from right to left." & vbCrLf )
        Console.WriteLine( "Initial values of array:" & vbCrLf )

        ' Display the initial array values and ByteLength.
        DisplayArray( arr )
        Console.WriteLine( vbCrLf & _
            "Buffer.ByteLength( arr ): {0}", _
            Buffer.ByteLength( arr ) )

        ' Copy a region of the array; set a byte within the array.
        Console.WriteLine( vbCrLf & _
            "Call these methods: " & vbCrLf & _
            "  Buffer.BlockCopy( arr, 5, arr, 16, 9 )," & vbCrLf & _
            "  Buffer.SetByte( arr, 7, 170 )." & vbCrLf )

        Buffer.BlockCopy( arr, 5, arr, 16, 9 )
        Buffer.SetByte( arr, 7, 170 )

        ' Display the array and a byte within the array.
        Console.WriteLine( "Final values of array:" & vbCrLf )
        DisplayArray( arr )
        Console.WriteLine( vbCrLf & _
            "Buffer.GetByte( arr, 26 ): {0}", _
            Buffer.GetByte( arr, 26 ) )
    End Sub 
End Module 

' This example of the Buffer class methods generates the following output.
' Note: The array is displayed from right to left.
' 
' Initial values of array:
' 
'   arr: 010F 010E 010D 010C 010B 010A 0109 0108 0107 0106 0105 0104 0103 0102
' 
' Buffer.ByteLength( arr ): 28
' 
' Call these methods:
'   Buffer.BlockCopy( arr, 5, arr, 16, 9 ),
'   Buffer.SetByte( arr, 7, 170 ).
' 
' Final values of array:
' 
'   arr: 010F 0101 0801 0701 0601 0501 0109 0108 0107 0106 AA05 0104 0103 0102
' 
' Buffer.GetByte( arr, 26 ): 15

Remarques

Buffer affecte uniquement les tableaux de types primitifs ; cette classe ne s’applique pas aux objets. Chaque type primitif est traité comme une série d’octets sans tenir compte du comportement ou de la limitation associée au type primitif.

Buffer fournit des méthodes pour copier des octets d’un tableau de types primitifs vers un autre tableau de types primitifs, obtenir un octet à partir d’un tableau, définir un octet dans un tableau et obtenir la longueur d’un tableau. Cette classe offre de meilleures performances pour manipuler des types primitifs que des méthodes similaires dans la System.Array classe.

Bufferest applicable aux types primitifs suivants : Boolean, CharSByteByteInt16UInt16Int32UInt32, Int64, UInt64IntPtr, UIntPtr, Single, et .Double