Decimal.ToInt64 メソッドとは何？わかりやすく解説 Weblio辞書

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Decimal.ToInt64 メソッド

指定した Decimal の値を、等価の 64 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 ToInt64
 ( _
    d As Decimal _
) As Long

Visual Basic (使用法)

Dim d As Decimal
Dim returnValue As Long

returnValue = Decimal.ToInt64(d)

public static long ToInt64 (
    decimal d
)

C++

public:
static long long ToInt64 (
    Decimal d
)

public static long ToInt64 (
    Decimal d
)

JScript

public static function ToInt64
 (
    d : decimal
) : long

パラメータ

d: 変換する Decimal 値。

戻り値
d の値と等価の 64 ビット符号付き整数。

例外

例外の種類	条件
OverflowException	d が Int64.MinValue より小さい値か、Int64.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

ToInt64 メソッドを使用して、Decimal 数値を Int64 値に変換するコード例を次に示します。

Visual Basic

' Example of the Decimal.ToInt64 and Decimal.ToUInt64 methods.
Imports System
Imports Microsoft.VisualBasic

Module DecimalToU_Int64Demo

    Dim formatter As String
 = "{0,25}{1,22}{2,22}"

    ' 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_Int64( argument As Decimal
 )

        Dim Int64Value    As Object
        Dim UInt64Value   As Object

        ' Convert the argument to a Long value.
        Try
            Int64Value = Decimal.ToInt64( argument )
        Catch ex As Exception
            Int64Value = GetExceptionType( ex )
        End Try

        ' Convert the argument to a UInt64 value.
        Try
            UInt64Value = Decimal.ToUInt64( argument )
        Catch ex As Exception
            UInt64Value = GetExceptionType( ex )
        End Try

        Console.WriteLine( formatter, argument, _
            Int64Value, UInt64Value )
    End Sub

    Sub Main( )

        Console.WriteLine( "This example of the "
 & vbCrLf & _
            "  Decimal.ToInt64( Decimal ) and " &
 vbCrLf & _
            "  Decimal.ToUInt64( Decimal ) " &
 vbCrLf & "methods " & _
            "generates the following output. It "
 & vbCrLf & _
            "displays several converted Decimal values."
 & vbCrLf )
        Console.WriteLine( formatter, "Decimal argument",
 _
            "Long/exception", "UInt64/exception"
 )
        Console.WriteLine( formatter, "----------------",
 _
            "--------------", "----------------"
 )

        ' Convert Decimal values and display the results.
        DecimalToU_Int64( 123D )
        DecimalToU_Int64( New Decimal( 123000,
 0, 0, False, 3 ) )
        DecimalToU_Int64( 123.999D )
        DecimalToU_Int64( 18446744073709551615.999D )
        DecimalToU_Int64( 18446744073709551616D )
        DecimalToU_Int64( 9223372036854775807.999D )
        DecimalToU_Int64( 9223372036854775808D )
        DecimalToU_Int64( - 0.999D )
        DecimalToU_Int64( - 1D )
        DecimalToU_Int64( - 9223372036854775808.999D )
        DecimalToU_Int64( - 9223372036854775809D )
    End Sub 
End Module 

' This example of the
'   Decimal.ToInt64( Decimal ) and
'   Decimal.ToUInt64( Decimal )
' methods generates the following output. It
' displays several converted Decimal values.
' 
'          Decimal argument        Long/exception      UInt64/exception
'          ----------------        --------------      ----------------
'                       123                   123                  
 123
'                   123.000                   123                  
 123
'                   123.999                   123                  
 123
'  18446744073709551615.999     OverflowException  18446744073709551615
'      18446744073709551616     OverflowException     OverflowException
'   9223372036854775807.999   9223372036854775807   9223372036854775807
'       9223372036854775808     OverflowException   9223372036854775808
'                    -0.999                     0                  
   0
'                        -1                    -1     OverflowException
'  -9223372036854775808.999  -9223372036854775808     OverflowException
'      -9223372036854775809     OverflowException     OverflowException

// Example of the decimal.ToInt64 and decimal.ToUInt64 methods.
using System;

class DecimalToU_Int64Demo
{
    const string formatter = "{0,25}{1
,22}{2,22}";

    // 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_Int64(
 decimal argument )
    {
        object Int64Value;
        object UInt64Value;

        // Convert the argument to a long value.
        try
        {
            Int64Value = decimal.ToInt64( argument );
        }
        catch( Exception ex )
        {
            Int64Value = GetExceptionType( ex );
        }

        // Convert the argument to a ulong value.
        try
        {
            UInt64Value = decimal.ToUInt64( argument );
        }
        catch( Exception ex )
        {
            UInt64Value = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument, 
            Int64Value, UInt64Value );
    }

    public static void Main(
 )
    {
        Console.WriteLine( "This example of the \n" +
            "  decimal.ToInt64( decimal ) and \n" +
            "  decimal.ToUInt64( decimal ) \nmethods " +
            "generates the following output. It \ndisplays " +
            "several converted decimal values.\n" );
        Console.WriteLine( formatter, "decimal argument", 
            "long/exception", "ulong/exception" );
        Console.WriteLine( formatter, "----------------", 
            "--------------", "---------------" );

        // Convert decimal values and display the results.
        DecimalToU_Int64( 123M );
        DecimalToU_Int64( new decimal( 123000, 0, 0, false,
 3 ) );
        DecimalToU_Int64( 123.999M );
        DecimalToU_Int64( 18446744073709551615.999M );
        DecimalToU_Int64( 18446744073709551616M );
        DecimalToU_Int64( 9223372036854775807.999M );
        DecimalToU_Int64( 9223372036854775808M );
        DecimalToU_Int64( - 0.999M );
        DecimalToU_Int64( - 1M );
        DecimalToU_Int64( - 9223372036854775808.999M );
        DecimalToU_Int64( - 9223372036854775809M );
    }
}

/*
This example of the
  decimal.ToInt64( decimal ) and
  decimal.ToUInt64( decimal )
methods generates the following output. It
displays several converted decimal values.

         decimal argument        long/exception       ulong/exception
         ----------------        --------------       ---------------
                      123                   123                   123
                  123.000                   123                   123
                  123.999                   123                   123
 18446744073709551615.999     OverflowException  18446744073709551615
     18446744073709551616     OverflowException     OverflowException
  9223372036854775807.999   9223372036854775807   9223372036854775807
      9223372036854775808     OverflowException   9223372036854775808
                   -0.999                     0                     0
                       -1                    -1     OverflowException
 -9223372036854775808.999  -9223372036854775808     OverflowException
     -9223372036854775809     OverflowException     OverflowException
*/

C++

// Example of the Decimal::ToInt64 and Decimal::ToUInt64 methods.
using namespace System;
#define formatter "{0,25}{1,22}{2,22}"

// 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_Int64( Decimal argument )
{
   Object^ Int64Value;
   Object^ UInt64Value;
   
   // Convert the argument to an __int64 value.
   try
   {
      Int64Value = Decimal::ToInt64( argument );
   }
   catch ( Exception^ ex ) 
   {
      Int64Value = GetExceptionType( ex );
   }

   
   // Convert the argument to an unsigned __int64 value.
   try
   {
      UInt64Value = Decimal::ToUInt64( argument );
   }
   catch ( Exception^ ex ) 
   {
      UInt64Value = GetExceptionType( ex );
   }

   Console::WriteLine( formatter, argument, Int64Value, UInt64Value );
}

int main()
{
   Console::WriteLine( "This example of the \n"
   "  Decimal::ToInt64( Decimal ) and \n"
   "  Decimal::ToUInt64( Decimal ) \nmethods "
   "generates the following output. It \ndisplays "
   "several converted Decimal values.\n" );
   Console::WriteLine( formatter, "Decimal argument", "__int64/exception",
 "unsigned __int64" );
   Console::WriteLine( formatter, "----------------", "-----------------",
 "----------------" );
   
   // Convert Decimal values and display the results.
   DecimalToU_Int64( Decimal::Parse(  "123" ) );
   DecimalToU_Int64( Decimal(123000,0,0,false,3) );
   DecimalToU_Int64( Decimal::Parse(  "123.999" ) );
   DecimalToU_Int64( Decimal::Parse(  "18446744073709551615.999" ) );
   DecimalToU_Int64( Decimal::Parse(  "18446744073709551616" ) );
   DecimalToU_Int64( Decimal::Parse(  "9223372036854775807.999" ) );
   DecimalToU_Int64( Decimal::Parse(  "9223372036854775808" ) );
   DecimalToU_Int64( Decimal::Parse(  "-0.999" ) );
   DecimalToU_Int64( Decimal::Parse(  "-1" ) );
   DecimalToU_Int64( Decimal::Parse(  "-9223372036854775808.999" ) );
   DecimalToU_Int64( Decimal::Parse(  "-9223372036854775809" ) );
}

/*
This example of the
  Decimal::ToInt64( Decimal ) and
  Decimal::ToUInt64( Decimal )
methods generates the following output. It
displays several converted Decimal values.

         Decimal argument     __int64/exception      unsigned __int64
         ----------------     -----------------      ----------------
                      123                   123                   123
                  123.000                   123                   123
                  123.999                   123                   123
 18446744073709551615.999     OverflowException  18446744073709551615
     18446744073709551616     OverflowException     OverflowException
  9223372036854775807.999   9223372036854775807   9223372036854775807
      9223372036854775808     OverflowException   9223372036854775808
                   -0.999                     0                     0
                       -1                    -1     OverflowException
 -9223372036854775808.999  -9223372036854775808     OverflowException
     -9223372036854775809     OverflowException     OverflowException
*/

// Example of the decimal.ToInt64 and decimal.ToUInt64 methods.
import System.*;

class DecimalToU_Int64Demo
{
    private static final String formatter =
 "{0,25}{1,22}{2,22}";
   
    // 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_Int64(System.Decimal
 argument) 
    {
        Object int64Value;
        Object uint64Value;
          
        // Convert the argument to a long value.
        try {
            int64Value = (System.Int64)System.Decimal.ToInt64(argument);
        }
        catch(System.Exception  ex){
            int64Value = GetExceptionType(ex);
        }
          
        // Convert the argument to a ulong value.
        try {
            uint64Value = System.Decimal.ToUInt64(argument);
        }
        catch(System.Exception  ex){  
            uint64Value = GetExceptionType(ex);
        }
        Console.WriteLine(formatter, argument, int64Value, uint64Value);
    }
   
    public static void main(String[]
 args)
    {
        Console.WriteLine(("This example of the \n" 
            + "  decimal.ToInt64( decimal ) and \n" 
            + "  decimal.ToUInt64( decimal ) \nmethods " 
            + "generates the following output. It \ndisplays " 
            + "several converted decimal values.\n"));
        
        Console.WriteLine(formatter, "decimal argument", "long/exception",
 
            "ulong/exception");
        Console.WriteLine(formatter, "----------------", "--------------",
 
            "---------------");
      
        // Convert decimal values and display the results.
        DecimalToU_Int64(new System.Decimal(123));
        DecimalToU_Int64(new System.Decimal(123000, 0, 0, false,
 (ubyte)3));
        DecimalToU_Int64(new System.Decimal(123.999));
        DecimalToU_Int64(new System.Decimal(18446744073709551615.999));
        DecimalToU_Int64(new System.Decimal(18446744073709551616F));
        DecimalToU_Int64(new System.Decimal(9223372036854775807.999));
        DecimalToU_Int64(new System.Decimal(9223372036854775808F));
        DecimalToU_Int64(new System.Decimal(-0.999));
        DecimalToU_Int64(new System.Decimal(-1));
        DecimalToU_Int64(new System.Decimal(-9223372036854775808.999));
        DecimalToU_Int64(new System.Decimal(-9223372036854775809F));
    }
}

/*
This example of the
  decimal.ToInt64( decimal ) and
  decimal.ToUInt64( decimal )
methods generates the following output. It
displays several converted decimal values.

         decimal argument        long/exception       ulong/exception
         ----------------        --------------       ---------------
                      123                   123                   123
                  123.000                   123                   123
                  123.999                   123                   123
     18446744073709600000     OverflowException     OverflowException
     18446740000000000000     OverflowException  18446740000000000000
      9223372036854780000     OverflowException   9223372036854780000
      9223372000000000000   9223372000000000000   9223372000000000000
                   -0.999                     0                     0
                       -1                    -1     OverflowException
     -9223372036854780000     OverflowException     OverflowException
     -9223372000000000000  -9223372000000000000     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
Int64

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