Buffer.ByteLength メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

Buffer.ByteLength メソッド

指定した配列のバイト数を返します。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Shared Function ByteLength
 ( _
    array As Array _
) As Integer

Visual Basic (使用法)

Dim array As Array
Dim returnValue As Integer

returnValue = Buffer.ByteLength(array)

public static int ByteLength
 (
    Array array
)

C++

public:
static int ByteLength (
    Array^ array
)

public static int ByteLength
 (
    Array array
)

JScript

public static function ByteLength
 (
    array : Array
) : int

パラメータ

array: 配列。

戻り値
配列のバイト数。

例外

例外の種類	条件
ArgumentNullException	array が null 参照 (Visual Basic では Nothing) です。
ArgumentException	array がプリミティブではありません。

使用例

ByteLength メソッドを使用して、配列内のバイト数を返すコード例を次に示します。

Visual Basic

' Example of the Buffer.ByteLength method.
Imports System
Imports Microsoft.VisualBasic

Module ByteLengthDemo

    Const formatter As String
 = "{0,10}{1,20}{2,9}{3,12}"

    Sub ArrayInfo( arr As Array, name As
 String )

        Dim byteLength As Integer
 = Buffer.ByteLength( arr )

        ' Display the array name, type, Length, and ByteLength.
        Console.WriteLine( formatter, name, arr.GetType, arr.Length, _
            byteLength )
    End Sub

    Sub Main( )
        Dim bytes( )   As Byte
    = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 }
        Dim bools( )   As Boolean
 = { True, False, True,
 False, True }
        Dim chars( )   As Char
    = { " "c, "$"c,
 """"c, "A"c, "{"c }
        Dim shorts( )  As Short
   = { 258, 259, 260, 261, 262, 263 }
        Dim singles( ) As Single
  = { 1, 678, 2.37E33, .00415, 8.9 }
        Dim doubles( ) As Double
  = { 2E-22, .003, 4.4E44, 555E55 }
        Dim longs( )   As Long
    = { 1, 10, 100, 1000, 10000, 100000 }

        Console.WriteLine( _
            "This example of the Buffer.ByteLength( Array ) "
 & _
            vbCrLf & "method generates the following output."
 & vbCrLf )
        Console.WriteLine( formatter, "Array name",
 "Array type", _
            "Length", "ByteLength"
 )
        Console.WriteLine( formatter, "----------",
 "----------", _
            "------", "----------"
 )

        ' Display the Length and ByteLength for each array.
        ArrayInfo( bytes, "bytes" )
        ArrayInfo( bools, "bools" )
        ArrayInfo( chars, "chars" )
        ArrayInfo( shorts, "shorts" )
        ArrayInfo( singles, "singles" )
        ArrayInfo( doubles, "doubles" )
        ArrayInfo( longs, "longs" )
    End Sub 
End Module 

' This example of the Buffer.ByteLength( Array )
' method generates the following output.
' 
' Array name          Array type   Length  ByteLength
' ----------          ----------   ------  ----------
'      bytes       System.Byte[]       10          10
'      bools    System.Boolean[]        5           5
'      chars       System.Char[]        5          10
'     shorts      System.Int16[]        6          12
'    singles     System.Single[]        5          20
'    doubles     System.Double[]        4          32
'      longs      System.Int64[]        6          48

// Example of the Buffer.ByteLength method.
using System;

class ByteLengthDemo
{
    const string formatter = "{0,10}{1
,20}{2,9}{3,12}";

    public static void ArrayInfo(
 Array arr, string name )
    {
        int byteLength = Buffer.ByteLength( arr );

        // Display the array name, type, Length, and ByteLength.
        Console.WriteLine( formatter, name, arr.GetType( ), 
            arr.Length, byteLength );
    }

    public static void Main(
 )
    {
        byte[ ]   bytes   = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
        bool[ ]   bools   = { true, false,
 true, false, true };
        char[ ]   chars   = { ' ', '$', '\"', 'A', '{' };
        short[ ]  shorts  = { 258, 259, 260, 261, 262, 263 };
        float[ ]  singles = { 1, 678, 2.37E33F, .00415F, 8.9F
 };
        double[ ] doubles = { 2E-22, .003, 4.4E44, 555E55 };
        long[ ]   longs   = { 1, 10, 100, 1000, 10000, 100000 };

        Console.WriteLine( 
            "This example of the Buffer.ByteLength( Array ) " +
            "\nmethod generates the following output.\n" );
        Console.WriteLine( formatter, "Array name", "Array type",
 
            "Length", "ByteLength" );
        Console.WriteLine( formatter, "----------", "----------",
 
            "------", "----------" );

        // Display the Length and ByteLength for each array.
        ArrayInfo( bytes, "bytes" );
        ArrayInfo( bools, "bools" );
        ArrayInfo( chars, "chars" );
        ArrayInfo( shorts, "shorts" );
        ArrayInfo( singles, "singles" );
        ArrayInfo( doubles, "doubles" );
        ArrayInfo( longs, "longs" );
    }
}

/*
This example of the Buffer.ByteLength( Array )
method generates the following output.

Array name          Array type   Length  ByteLength
----------          ----------   ------  ----------
     bytes       System.Byte[]       10          10
     bools    System.Boolean[]        5           5
     chars       System.Char[]        5          10
    shorts      System.Int16[]        6          12
   singles     System.Single[]        5          20
   doubles     System.Double[]        4          32
     longs      System.Int64[]        6          48
*/

C++

// Example of the Buffer::ByteLength method.
using namespace System;

void ArrayInfo( Array^ arr, String^ name )
{
   int byteLength = Buffer::ByteLength( arr );
   
   // Display the array name, type, Length, and ByteLength.
   Console::WriteLine( "{0,10}{1,20}{2,9}{3,12}", name, arr->GetType(),
 arr->Length, byteLength );
}

int main()
{
   array<unsigned char>^bytes = {1,2,3,4,5,6,7,8,9,0};
   array<bool>^bools = {true,false
,true,false,true};
   array<Char>^chars = {' ','$','\"','A','{'};
   array<short>^shorts = {258,259,260,261,262,263};
   array<float>^singles = {1,678,2.37E33F,.00415F,8.9F};
   array<double>^doubles = {2E-22,.003,4.4E44,555E55};
   array<long>^longs = {1,10,100,1000,10000,100000};
   Console::WriteLine( "This example of the Buffer::ByteLength( Array* ) "
   "\nmethod generates the following output.\n" );
   Console::WriteLine( "{0,10}{1,20}{2,9}{3,12}", "Array name",
 "Array type", "Length", "ByteLength" );
   Console::WriteLine( "{0,10}{1,20}{2,9}{3,12}", "----------",
 "----------", "------", "----------" );
   
   // Display the Length and ByteLength for each array.
   ArrayInfo( bytes, "bytes" );
   ArrayInfo( bools, "bools" );
   ArrayInfo( chars, "chars" );
   ArrayInfo( shorts, "shorts" );
   ArrayInfo( singles, "singles" );
   ArrayInfo( doubles, "doubles" );
   ArrayInfo( longs, "longs" );
}

/*
This example of the Buffer::ByteLength( Array* )
method generates the following output.

Array name          Array type   Length  ByteLength
----------          ----------   ------  ----------
     bytes       System.Byte[]       10          10
     bools    System.Boolean[]        5           5
     chars       System.Char[]        5          10
    shorts      System.Int16[]        6          12
   singles     System.Single[]        5          20
   doubles     System.Double[]        4          32
     longs      System.Int32[]        6          24
*/

// Example of the Buffer.ByteLength method.
import System.*;
import System.Console;

class ByteLengthDemo
{
    private static String formatter = "{0
,10}{1,20}{2,9}{3,12}";

    public static void ArrayInfo(Array
 arr, String name)
    {
        int byteLength = Buffer.ByteLength(arr);

        // Display the array name, type, Length, and ByteLength.
        Object objArr[] = new Object [] { name, arr.GetType().ToString(),
 
            (Int32)arr.get_Length(), (Int32)byteLength };
        Console.WriteLine(formatter, objArr);
    } //ArrayInfo

    public static void main(String[]
 args)
    {
        ubyte bytes[] =  { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
        boolean bools[] =  { true, false, true,
 false, true };
        char chars[] =  { ' ', '$', '"', 'A', '{' };
        short shorts[] =  { 258, 259, 260, 261, 262, 263 };
        float singles[] =  { 1F, 678F, 2.37E+33F,0.00415F,8.9F
 };
        double doubles[] =  { 2E-22, 0.003, 4.4E+44, 5.55E+57 };
        long longs[] =  { 1, 10, 100, 1000, 10000, 100000 };
        Object objArr1[] = new Object[] { "Array name","Array
 type", "Length", 
            "ByteLength" };

        Console.WriteLine("This example of the Buffer.ByteLength( Array )\n"
  
            + "method generates the following output.\n");
        Console.WriteLine(formatter, objArr1);

        Object objArr2[] = new Object[] { "----------",
 "----------", 
            "------", "----------" };
        Console.WriteLine(formatter, objArr2);

        // Display the Length and ByteLength for each array.
        ArrayInfo(bytes, "bytes");
        ArrayInfo(bools, "bools");
        ArrayInfo(chars, "chars");
        ArrayInfo(shorts, "shorts");
        ArrayInfo(singles, "singles");
        ArrayInfo(doubles, "doubles");
        ArrayInfo(longs, "longs");
    } //main
} //ByteLengthDemo

/*
This example of the Buffer.ByteLength( Array )
method generates the following output.

Array name          Array type   Length  ByteLength
----------          ----------   ------  ----------
     bytes       System.Byte[]       10          10
     bools    System.Boolean[]        5           5
     chars       System.Char[]        5          10
    shorts      System.Int16[]        6          12
   singles     System.Single[]        5          20
   doubles     System.Double[]        4          32
     longs      System.Int64[]        6          48
*/

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
Buffer クラス
Buffer メンバ
System 名前空間

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Buffer.ByteLength メソッドとは？わかりやすく解説