Decimal.ToByte メソッド

.NET Framework クラス ライブラリ リファレンス

Decimal.ToByte メソッド

指定した Decimal の値を、等価の 8 ビット符号なし整数に変換します。

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

Visual Basic (宣言)

Public Shared Function ToByte
 ( _
    value As Decimal _
) As Byte

Visual Basic (使用法)

Dim value As Decimal
Dim returnValue As Byte

returnValue = Decimal.ToByte(value)

C#

public static byte ToByte (
    decimal value
)

C++

public:
static unsigned char ToByte (
    Decimal value
)

J#

public static byte ToByte (
    Decimal value
)

JScript

public static function ToByte
 (
    value : decimal
) : byte

パラメータ

value

Decimal 値。

戻り値
value と等価の 8 ビット符号なし整数。

例外

例外の種類	条件
OverflowException	value が Byte.MinValue より小さい値か、Byte.MaxValue より大きい値です。

解説

パラメータ value が 0 方向の近似整数値に丸められ、その結果が返されます。

使用例

ToByte メソッドを使用して、Decimal の数値を Byte の値に変換するコード例を次に示します。

Visual Basic

' Example of the Decimal.ToSByte and Decimal.ToByte methods.
Imports System
Imports Microsoft.VisualBasic

Module DecimalToS_ByteDemo

    Dim formatter As String
 = "{0,16}{1,19}{2,19}"

    ' Get the exception type name; remove the namespace prefix.
    Function GetExceptionType( ex As Exception
 ) As String

        Dim exceptionType   As String
 = ex.GetType( ).ToString( )
        Return  exceptionType.Substring( _
            exceptionType.LastIndexOf( "."c ) + 1
 )
    End Function

    ' Convert the Decimal argument; catch exceptions that are thrown.
    Sub DecimalToS_Byte( argument As Decimal
 )

        Dim SByteValue    As Object
        Dim ByteValue   As Object

        ' Convert the argument to an SByte value.
        Try
            SByteValue = Decimal.ToSByte( argument )
        Catch ex As Exception
            SByteValue = GetExceptionType( ex )
        End Try

        ' Convert the argument to a Byte value.
        Try
            ByteValue = Decimal.ToByte( argument )
        Catch ex As Exception
            ByteValue = GetExceptionType( ex )
        End Try

        Console.WriteLine( formatter, argument, _
            SByteValue, ByteValue )
    End Sub

    Sub Main( )

        Console.WriteLine( "This example of the "
 & vbCrLf & _
            "  Decimal.ToSByte( Decimal ) and " &
 vbCrLf & _
            "  Decimal.ToByte( Decimal ) " & vbCrLf
 & "methods " & _
            "generates the following output. It "
 & vbCrLf & _
            "displays several converted Decimal values."
 & vbCrLf )
        Console.WriteLine( formatter, "Decimal argument",
 _
            "SByte/exception", "Byte/exception"
 )
        Console.WriteLine( formatter, "----------------",
 _
            "---------------", "--------------"
 )

        ' Convert Decimal values and display the results.
        DecimalToS_Byte( 78D )
        DecimalToS_Byte( New Decimal( 78000,
 0, 0, False, 3 ) )
        DecimalToS_Byte( 78.999D )
        DecimalToS_Byte( 255.999D )
        DecimalToS_Byte( 256D )
        DecimalToS_Byte( 127.999D )
        DecimalToS_Byte( 128D )
        DecimalToS_Byte( - 0.999D )
        DecimalToS_Byte( - 1D )
        DecimalToS_Byte( - 128.999D )
        DecimalToS_Byte( - 129D )
    End Sub 
End Module 

' This example of the
'   Decimal.ToSByte( Decimal ) and
'   Decimal.ToByte( Decimal )
' methods generates the following output. It
' displays several converted Decimal values.
' 
' Decimal argument    SByte/exception     Byte/exception
' ----------------    ---------------     --------------
'               78                 78                 78
'           78.000                 78                 78
'           78.999                 78                 78
'          255.999  OverflowException                255
'              256  OverflowException  OverflowException
'          127.999                127                127
'              128  OverflowException                128
'           -0.999                  0                  0
'               -1                 -1  OverflowException
'         -128.999               -128  OverflowException
'             -129  OverflowException  OverflowException

C#

// Example of the decimal.ToSByte and decimal.ToByte methods.
using System;

class DecimalToS_ByteDemo
{
    const string formatter = "{0,16}{1
,19}{2,19}";

    // Get the exception type name; remove the namespace prefix.
    public static string
 GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring( 
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the decimal argument; catch exceptions that are thrown.
    public static void DecimalToS_Byte(
 decimal argument )
    {
        object SByteValue;
        object ByteValue;

        // Convert the argument to an sbyte value.
        try
        {
            SByteValue = decimal.ToSByte( argument );
        }
        catch( Exception ex )
        {
            SByteValue = GetExceptionType( ex );
        }

        // Convert the argument to a byte value.
        try
        {
            ByteValue = decimal.ToByte( argument );
        }
        catch( Exception ex )
        {
            ByteValue = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument, 
            SByteValue, ByteValue );
    }

    public static void Main(
 )
    {
        Console.WriteLine( "This example of the \n" +
            "  decimal.ToSByte( decimal ) and \n" +
            "  decimal.ToByte( decimal ) \nmethods " +
            "generates the following output. It \ndisplays " +
            "several converted decimal values.\n" );
        Console.WriteLine( formatter, "decimal argument", 
            "sbyte/exception", "byte/exception" );
        Console.WriteLine( formatter, "----------------", 
            "---------------", "--------------" );

        // Convert decimal values and display the results.
        DecimalToS_Byte( 78M );
        DecimalToS_Byte( new decimal( 78000, 0, 0, false,
 3 ) );
        DecimalToS_Byte( 78.999M );
        DecimalToS_Byte( 255.999M );
        DecimalToS_Byte( 256M );
        DecimalToS_Byte( 127.999M );
        DecimalToS_Byte( 128M );
        DecimalToS_Byte( -0.999M );
        DecimalToS_Byte( -1M );
        DecimalToS_Byte( -128.999M );
        DecimalToS_Byte( -129M );
    }
}

/*
This example of the
  decimal.ToSByte( decimal ) and
  decimal.ToByte( decimal )
methods generates the following output. It
displays several converted decimal values.

decimal argument    sbyte/exception     byte/exception
----------------    ---------------     --------------
              78                 78                 78
          78.000                 78                 78
          78.999                 78                 78
         255.999  OverflowException                255
             256  OverflowException  OverflowException
         127.999                127                127
             128  OverflowException                128
          -0.999                  0                  0
              -1                 -1  OverflowException
        -128.999               -128  OverflowException
            -129  OverflowException  OverflowException
*/

C++

// Example of the Decimal::ToByte and Decimal::ToSByte methods.
using namespace System;
#define formatter "{0,16}{1,19}{2,19}"

// Get the exception type name; remove the namespace prefix.
String^ GetExceptionType( Exception^ ex )
{
   String^ exceptionType = ex->GetType()->ToString();
   return exceptionType->Substring( exceptionType->LastIndexOf(
 '.' ) + 1 );
}


// Convert the Decimal argument; catch exceptions that are thrown.
void DecimalToS_Byte( Decimal argument )
{
   Object^ ByteValue;
   Object^ SByteValue;
   
   // Convert the argument to an unsigned char value.
   try
   {
      ByteValue = Decimal::ToByte( argument );
   }
   catch ( Exception^ ex ) 
   {
      ByteValue = GetExceptionType( ex );
   }

   
   // Convert the argument to a signed char value.
   try
   {
      SByteValue = Decimal::ToSByte( argument );
   }
   catch ( Exception^ ex ) 
   {
      SByteValue = GetExceptionType( ex );
   }

   Console::WriteLine( formatter, argument, ByteValue, SByteValue );
}

int main()
{
   Console::WriteLine( "This example of the \n"
   "  Decimal::ToByte( Decimal ) and \n"
   "  Decimal::ToSByte( Decimal ) \nmethods "
   "generates the following output. It \ndisplays "
   "several converted Decimal values.\n" );
   Console::WriteLine( formatter, "Decimal argument", "unsigned char",
 "(signed) char" );
   Console::WriteLine( formatter, "----------------", "-------------",
 "-------------" );
   
   // Convert Decimal values and display the results.
   DecimalToS_Byte( Decimal::Parse(  "78" ) );
   DecimalToS_Byte( Decimal(78000,0,0,false,3) );
   DecimalToS_Byte( Decimal::Parse(  "78.999" ) );
   DecimalToS_Byte( Decimal::Parse(  "255.999" ) );
   DecimalToS_Byte( Decimal::Parse(  "256" ) );
   DecimalToS_Byte( Decimal::Parse(  "127.999" ) );
   DecimalToS_Byte( Decimal::Parse(  "128" ) );
   DecimalToS_Byte( Decimal::Parse(  "-0.999" ) );
   DecimalToS_Byte( Decimal::Parse(  "-1" ) );
   DecimalToS_Byte( Decimal::Parse(  "-128.999" ) );
   DecimalToS_Byte( Decimal::Parse(  "-129" ) );
}

/*
This example of the
  Decimal::ToByte( Decimal ) and
  Decimal::ToSByte( Decimal )
methods generates the following output. It
displays several converted Decimal values.

Decimal argument      unsigned char      (signed) char
----------------      -------------      -------------
              78                 78                 78
          78.000                 78                 78
          78.999                 78                 78
         255.999                255  OverflowException
             256  OverflowException  OverflowException
         127.999                127                127
             128                128  OverflowException
          -0.999                  0                  0
              -1  OverflowException                 -1
        -128.999  OverflowException               -128
            -129  OverflowException  OverflowException
*/

J#

// Example of the decimal.ToSByte and decimal.ToByte methods.
import System.*;

class DecimalToS_ByteDemo
{
    private final static String formatter =
 "{0,16}{1,19}{2,19}";
      
    // Get the exception type name; remove the namespace prefix.
    public static String GetExceptionType(System.Exception
 ex) 
    {
        String exceptionType = ex.GetType().ToString();
        return exceptionType.Substring((exceptionType.LastIndexOf('.')
 + 1));
    }
      
    // Convert the decimal argument; catch exceptions that are thrown.
    public static void DecimalToS_Byte(System.Decimal
 argument)
    {
        Object sbyteValue;
        Object byteValue;
      
        // Convert the argument to an sbyte value.
        try {
            sbyteValue = (System.SByte)System.Decimal.ToSByte(argument);
        }
        catch(System.Exception ex) {
            sbyteValue = GetExceptionType(ex);
        }
          
        // Convert the argument to a byte value.
        try {
            byteValue = (System.Byte)(System.Decimal.ToByte(argument));
        }
        catch(System.Exception ex) {
            byteValue = GetExceptionType(ex);
        }
        Console.WriteLine(formatter, argument, sbyteValue, byteValue);
    }
   
    public static void main(String[]
 args)
    {
        Console.WriteLine("This example of the \n" 
            + "  decimal.ToSByte( decimal ) and \n" 
            + "  decimal.ToByte( decimal ) \nmethods " 
            + "generates the following output. It \ndisplays " 
            + "several converted decimal values.\n");

        Console.WriteLine(formatter, "decimal argument", "sbyte/exception",
 
            "byte/exception");
        Console.WriteLine(formatter, "----------------", "---------------",
 
            "--------------");
      
        // Convert decimal values and display the results.
        DecimalToS_Byte(new Decimal(78));
        DecimalToS_Byte(new System.Decimal(78000, 0, 0, false,
 (ubyte)3));
        DecimalToS_Byte(new System.Decimal(78.999));
        DecimalToS_Byte(new System.Decimal(255.999));
        DecimalToS_Byte(new System.Decimal(256));
        DecimalToS_Byte(new System.Decimal(127.999));
        DecimalToS_Byte(new System.Decimal(128));
        DecimalToS_Byte(new System.Decimal(-0.999));
        DecimalToS_Byte(new System.Decimal(-1));
        DecimalToS_Byte(new System.Decimal(-128.999));
        DecimalToS_Byte(new System.Decimal(-129));
    }
}

/*
This example of the
  decimal.ToSByte( decimal ) and
  decimal.ToByte( decimal )
methods generates the following output. It
displays several converted decimal values.

decimal argument    sbyte/exception     byte/exception
----------------    ---------------     --------------
              78                 78                 78
          78.000                 78                 78
          78.999                 78                 78
         255.999  OverflowException                255
             256  OverflowException  OverflowException
         127.999                127                127
             128  OverflowException                128
          -0.999                  0                  0
              -1                 -1  OverflowException
        -128.999               -128  OverflowException
            -129  OverflowException  OverflowException
*/

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
Decimal 構造体
Decimal メンバ
System 名前空間
Byte 構造体