Decimal.ToInt32 メソッドとは何？わかりやすく解説 Weblio辞書

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Decimal.ToInt32 メソッド

指定した Decimal の値を、等価の 32 ビット符号付き整数に変換します。

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

Visual Basic (宣言)

Public Shared Function ToInt32
 ( _
    d As Decimal _
) As Integer

Visual Basic (使用法)

Dim d As Decimal
Dim returnValue As Integer

returnValue = Decimal.ToInt32(d)

public static int ToInt32
 (
    decimal d
)

C++

public:
static int ToInt32 (
    Decimal d
)

public static int ToInt32
 (
    Decimal d
)

JScript

public static function ToInt32
 (
    d : decimal
) : int

パラメータ

d: 変換する Decimal 値。

戻り値
d の値と等価の 32 ビット符号付き整数。

例外

例外の種類	条件
OverflowException	d が Int32.MinValue より小さい値か、Int32.MaxValue より大きい値です。

解説

戻り値は 10 進値の整数部分です。小数の桁は切り捨てられます。

使用例

ToInt32 メソッドを使用して、Decimal 数値を Int32 値に変換するコード例を次に示します。

Visual Basic

' Example of the Decimal.ToInt32 and Decimal.ToUInt32 methods.
Imports System
Imports Microsoft.VisualBasic

Module DecimalToU_Int32Demo

    Dim formatter As String
 = "{0,17}{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 DecimalToU_Int32( argument As Decimal
 )

        Dim Int32Value    As Object
        Dim UInt32Value   As Object

        ' Convert the argument to an Integer value.
        Try
            Int32Value = Decimal.ToInt32( argument )
        Catch ex As Exception
            Int32Value = GetExceptionType( ex )
        End Try

        ' Convert the argument to a UInt32 value.
        Try
            UInt32Value = Decimal.ToUInt32( argument )
        Catch ex As Exception
            UInt32Value = GetExceptionType( ex )
        End Try

        Console.WriteLine( formatter, argument, _
            Int32Value, UInt32Value )
    End Sub

    Sub Main( )

        Console.WriteLine( "This example of the "
 & vbCrLf & _
            "  Decimal.ToInt32( Decimal ) and " &
 vbCrLf & _
            "  Decimal.ToUInt32( Decimal ) " &
 vbCrLf & "methods " & _
            "generates the following output. It "
 & vbCrLf & _
            "displays several converted Decimal values."
 & vbCrLf )
        Console.WriteLine( formatter, "Decimal argument",
 _
            "Integer/exception", "UInt32/exception"
 )
        Console.WriteLine( formatter, "----------------",
 _
            "-----------------", "----------------"
 )

        ' Convert Decimal values and display the results.
        DecimalToU_Int32( 123D )
        DecimalToU_Int32( New Decimal( 123000,
 0, 0, False, 3 ) )
        DecimalToU_Int32( 123.999D )
        DecimalToU_Int32( 4294967295.999D )
        DecimalToU_Int32( 4294967296D )
        DecimalToU_Int32( 2147483647.999D )
        DecimalToU_Int32( 2147483648D )
        DecimalToU_Int32( - 0.999D )
        DecimalToU_Int32( - 1D )
        DecimalToU_Int32( - 2147483648.999D )
        DecimalToU_Int32( - 2147483649D )
    End Sub 
End Module 

' This example of the
'   Decimal.ToInt32( Decimal ) and
'   Decimal.ToUInt32( Decimal )
' methods generates the following output. It
' displays several converted Decimal values.
' 
'  Decimal argument  Integer/exception   UInt32/exception
'  ----------------  -----------------   ----------------
'               123                123                123
'           123.000                123                123
'           123.999                123                123
'    4294967295.999  OverflowException         4294967295
'        4294967296  OverflowException  OverflowException
'    2147483647.999         2147483647         2147483647
'        2147483648  OverflowException         2147483648
'            -0.999                  0                  0
'                -1                 -1  OverflowException
'   -2147483648.999        -2147483648  OverflowException
'       -2147483649  OverflowException  OverflowException

// Example of the decimal.ToInt32 and decimal.ToUInt32 methods.
using System;

class DecimalToU_Int32Demo
{
    const string formatter = "{0,17}{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 DecimalToU_Int32(
 decimal argument )
    {
        object Int32Value;
        object UInt32Value;

        // Convert the argument to an int value.
        try
        {
            Int32Value = decimal.ToInt32( argument );
        }
        catch( Exception ex )
        {
            Int32Value = GetExceptionType( ex );
        }

        // Convert the argument to a uint value.
        try
        {
            UInt32Value = decimal.ToUInt32( argument );
        }
        catch( Exception ex )
        {
            UInt32Value = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument, 
            Int32Value, UInt32Value );
    }

    public static void Main(
 )
    {
        Console.WriteLine( "This example of the \n" +
            "  decimal.ToInt32( decimal ) and \n" +
            "  decimal.ToUInt32( decimal ) \nmethods " +
            "generates the following output. It \ndisplays " +
            "several converted decimal values.\n" );
        Console.WriteLine( formatter, "decimal argument", 
            "int/exception", "uint/exception"
 );
        Console.WriteLine( formatter, "----------------", 
            "-------------", "--------------" );

        // Convert decimal values and display the results.
        DecimalToU_Int32( 123M );
        DecimalToU_Int32( new decimal( 123000, 0, 0, false,
 3 ) );
        DecimalToU_Int32( 123.999M );
        DecimalToU_Int32( 4294967295.999M );
        DecimalToU_Int32( 4294967296M );
        DecimalToU_Int32( 2147483647.999M );
        DecimalToU_Int32( 2147483648M );
        DecimalToU_Int32( - 0.999M );
        DecimalToU_Int32( - 1M );
        DecimalToU_Int32( - 2147483648.999M );
        DecimalToU_Int32( - 2147483649M );
    }
}

/*
This example of the
  decimal.ToInt32( decimal ) and
  decimal.ToUInt32( decimal )
methods generates the following output. It
displays several converted decimal values.

 decimal argument      int/exception     uint/exception
 ----------------      -------------     --------------
              123                123                123
          123.000                123                123
          123.999                123                123
   4294967295.999  OverflowException         4294967295
       4294967296  OverflowException  OverflowException
   2147483647.999         2147483647         2147483647
       2147483648  OverflowException         2147483648
           -0.999                  0                  0
               -1                 -1  OverflowException
  -2147483648.999        -2147483648  OverflowException
      -2147483649  OverflowException  OverflowException
*/

C++

// Example of the Decimal::ToInt32 and Decimal::ToUInt32 methods.
using namespace System;
#define formatter "{0,17}{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 DecimalToU_Int32( Decimal argument )
{
   Object^ Int32Value;
   Object^ UInt32Value;
   
   // Convert the argument to an int value.
   try
   {
      Int32Value = Decimal::ToInt32( argument );
   }
   catch ( Exception^ ex ) 
   {
      Int32Value = GetExceptionType( ex );
   }

   
   // Convert the argument to an unsigned int value.
   try
   {
      UInt32Value = Decimal::ToUInt32( argument );
   }
   catch ( Exception^ ex ) 
   {
      UInt32Value = GetExceptionType( ex );
   }

   Console::WriteLine( formatter, argument, Int32Value, UInt32Value );
}

int main()
{
   Console::WriteLine( "This example of the \n"
   "  Decimal::ToInt32( Decimal ) and \n"
   "  Decimal::ToUInt32( Decimal ) \nmethods "
   "generates the following output. It \ndisplays "
   "several converted Decimal values.\n" );
   Console::WriteLine( formatter, "Decimal argument", "int/exception",
 "unsigned int" );
   Console::WriteLine( formatter, "----------------", "-------------",
 "------------" );
   
   // Convert Decimal values and display the results.
   DecimalToU_Int32( Decimal::Parse(  "123" ) );
   DecimalToU_Int32( Decimal(123000,0,0,false,3) );
   DecimalToU_Int32( Decimal::Parse(  "123.999" ) );
   DecimalToU_Int32( Decimal::Parse(  "4294967295.999" ) );
   DecimalToU_Int32( Decimal::Parse(  "4294967296" ) );
   DecimalToU_Int32( Decimal::Parse(  "2147483647.999" ) );
   DecimalToU_Int32( Decimal::Parse(  "2147483648" ) );
   DecimalToU_Int32( Decimal::Parse(  "-0.999" ) );
   DecimalToU_Int32( Decimal::Parse(  "-1" ) );
   DecimalToU_Int32( Decimal::Parse(  "-2147483648.999" ) );
   DecimalToU_Int32( Decimal::Parse(  "-2147483649" ) );
}

/*
This example of the
  Decimal::ToInt32( Decimal ) and
  Decimal::ToUInt32( Decimal )
methods generates the following output. It
displays several converted Decimal values.

 Decimal argument      int/exception       unsigned int
 ----------------      -------------       ------------
              123                123                123
          123.000                123                123
          123.999                123                123
   4294967295.999  OverflowException         4294967295
       4294967296  OverflowException  OverflowException
   2147483647.999         2147483647         2147483647
       2147483648  OverflowException         2147483648
           -0.999                  0                  0
               -1                 -1  OverflowException
  -2147483648.999        -2147483648  OverflowException
      -2147483649  OverflowException  OverflowException
*/

// Example of the decimal.ToInt32 and decimal.ToUInt32 methods.
import System.*;

class DecimalToU_Int32Demo
{
    private static final String formatter =
 "{0,17}{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 DecimalToU_Int32(System.Decimal
 argument) 
    {
        Object int32Value;
        Object uint32Value;
          
        // Convert the argument to an int value.
        try {
            int32Value = (System.Int32)System.Decimal.ToInt32(argument);
        }
        catch(System.Exception  ex) {
            int32Value = GetExceptionType(ex);
        }
          
        // Convert the argument to a uint value.
        try {
            uint32Value = System.Decimal.ToUInt32(argument);
        }
        catch(System.Exception  ex) {
            uint32Value = GetExceptionType(ex);
        }
        Console.WriteLine(formatter, argument, int32Value, uint32Value);
    }
   
    public static void main(String[]
 args1)
    {
        Console.WriteLine("This example of the \n" 
            + "  decimal.ToInt32( decimal ) and \n" 
            + "  decimal.ToUInt32( decimal ) \nmethods " 
            + "generates the following output. It \ndisplays " 
            + "several converted decimal values.\n");
        
        Console.WriteLine(formatter, "decimal argument", 
            "int/exception", "uint/exception");
        
        Console.WriteLine(formatter, "----------------", 
            "-------------", "--------------");
      
        // Convert decimal values and display the results.
        DecimalToU_Int32(new System.Decimal(123));
        DecimalToU_Int32(new System.Decimal(123000, 0, 0, false,
 (ubyte)3));
        DecimalToU_Int32(new System.Decimal(123.999));
        DecimalToU_Int32(new System.Decimal(4294967295.999));
        DecimalToU_Int32(new System.Decimal(4294967296F));
        DecimalToU_Int32(new System.Decimal(2147483647.999));
        DecimalToU_Int32(new System.Decimal(2147483648F));
        DecimalToU_Int32(new System.Decimal(-0.999));
        DecimalToU_Int32(new System.Decimal(-1));
        DecimalToU_Int32(new System.Decimal(-2147483648.999));
        DecimalToU_Int32(new System.Decimal(-2147483649F));
   }
}

/*
This example of the
  decimal.ToInt32( decimal ) and
  decimal.ToUInt32( decimal )
methods generates the following output. It
displays several converted decimal values.

 decimal argument      int/exception     uint/exception
 ----------------      -------------     --------------
              123                123                123
          123.000                123                123
          123.999                123                123
   4294967295.999  OverflowException         4294967295
       4294967000  OverflowException         4294967000
   2147483647.999         2147483647         2147483647
       2147484000  OverflowException         2147484000
           -0.999                  0                  0
               -1                 -1  OverflowException
  -2147483648.999        -2147483648  OverflowException
      -2147484000  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
Int32

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