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。
Public Shared Function ToByte( _
ByVal value As Decimal _) As Byte
[C#]
public static byte ToByte(decimalvalue);
[C++]
public: static unsigned char ToByte(Decimalvalue);
[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
[Visual Basic, C#, C++] 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。
' 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 <mscorlib.dll>
using namespace System;
const __wchar_t* formatter = L"{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 = __box( Decimal::ToByte( argument ) );
}
catch( Exception* ex )
{
ByteValue = GetExceptionType( ex );
}
// Convert the argument to a signed char value.
try
{
SByteValue = __box( Decimal::ToSByte( argument ) );
}
catch( Exception* ex )
{
SByteValue = GetExceptionType( ex );
}
Console::WriteLine( formatter, __box( argument ),
ByteValue, SByteValue );
}
void main( )
{
Console::WriteLine( S"This example of the \n"
S" Decimal::ToByte( Decimal ) and \n"
S" Decimal::ToSByte( Decimal ) \nmethods "
S"generates the following output. It \ndisplays "
S"several converted Decimal values.\n" );
Console::WriteLine( formatter, S"Decimal argument",
S"unsigned char", S"(signed) char" );
Console::WriteLine( formatter, S"----------------",
S"-------------", S"-------------" );
// 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
*/
[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン .gif)
をクリックします。
必要条件
プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET