Buffer 类

参考

定义

命名空间:: System

程序集:: System.Runtime.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

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操作基元类型的数组。

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

继承: Object
Buffer

属性: ComVisibleAttribute

示例

下面的代码示例演示了多个 Buffer 类方法的使用。

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

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

int main()
{
   
   // This array is to be modified and displayed.
   array<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
*/

// 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

注解

Buffer 仅影响基元类型的数组;此类不适用于对象。每个基元类型都被视为一系列字节，而不考虑与基元类型关联的任何行为或限制。

Buffer 提供从基元类型的一个数组复制到另一个基元类型的数组、从数组获取字节、在数组中设置字节以及获取数组长度的方法。此类为操作基元类型提供了比类中 System.Array 类似方法更好的性能。

Buffer适用于以下基元类型：Boolean、、Char SByte、Byte、Int16、Int64 UInt32 Int32 UInt16 IntPtr UIntPtr UInt64、Single和。Double

方法

BlockCopy(Array, Int32, Array, Int32, Int32)	将指定数目的字节从起始于特定偏移量的源数组复制到起始于特定偏移量的目标数组。
ByteLength(Array)	返回指定数组中的字节数。
GetByte(Array, Int32)	检索指定数组中指定位置的字节。
MemoryCopy(Void, Void, Int64, Int64)	将指定为长整型值的一些字节从内存中的一个地址复制到另一个地址。此 API 不符合 CLS。
MemoryCopy(Void, Void, UInt64, UInt64)	将指定为无符号长整型值的一些字节从内存中的一个地址复制到另一个地址。此 API 不符合 CLS。
SetByte(Array, Int32, Byte)	将指定的值分配给指定数组中特定位置处的字节。

适用于

通过

Buffer 类

定义

示例

注解

方法

适用于

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