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Decimal-Konstruktor: (Int32, Int32, Int32, Boolean, Byte)

 

Veröffentlicht: Oktober 2016

Initialisiert einen neue Instanz von Decimal mit Parametern, die die Bestandteile der Instanz angeben.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public Decimal(
	int lo,
	int mid,
	int hi,
	bool isNegative,
	byte scale
)

Parameter

lo
Type: System.Int32

Die unteren 32 Bit einer 96-Bit-Ganzzahl.

mid
Type: System.Int32

Die mittleren 32 Bit einer 96-Bit-Ganzzahl.

hi
Type: System.Int32

Die oberen 32 Bit einer 96-Bit-Ganzzahl.

isNegative
Type: System.Boolean

true, um eine negative Zahl anzugeben; false, um eine positive Zahl anzugeben.

scale
Type: System.Byte

Eine Zehnerpotenz mit einem Exponenten zwischen 0 (null) und 28.

Exception Condition
ArgumentOutOfRangeException

scale ist größer als 28.

The binary representation of a T:System.Decimal number consists of a 1-bit sign, a 96-bit integer number, and a scaling factor used to divide the integer number and specify what portion of it is a decimal fraction. The scaling factor is implicitly the number 10 raised to an exponent ranging from 0 to 28.

The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with three T:System.Int32 value words, a T:System.Boolean sign, and a T:System.Byte scale factor.

// Example of the decimal( int, int, int, bool, byte ) constructor.
using System;

class DecimalCtorIIIBByDemo
{
    // 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 );
    }

    // Create a decimal object and display its value.
    public static void CreateDecimal( int low, int mid, int high, 
        bool isNeg, byte scale )
    {
        // Format the constructor for display.
        string ctor = String.Format( 
            "decimal( {0}, {1}, {2}, {3}, {4} )", 
            low, mid, high, isNeg, scale );
        string valOrExc;

        try
        {
            // Construct the decimal value.
            decimal decimalNum = new decimal( 
                low, mid, high, isNeg, scale );

            // Format and save the decimal value.
            valOrExc = decimalNum.ToString( );
        }
        catch( Exception ex )
        {
            // Save the exception type if an exception was thrown.
            valOrExc = GetExceptionType( ex );
        }

        // Display the constructor and decimal value or exception.
        int ctorLen = 76 - valOrExc.Length;

        // Display the data on one line if it will fit.
        if ( ctorLen > ctor.Length )
            Console.WriteLine( "{0}{1}", ctor.PadRight( ctorLen ), 
                valOrExc );

        // Otherwise, display the data on two lines.
        else
        {
            Console.WriteLine( "{0}", ctor );
            Console.WriteLine( "{0,76}", valOrExc );
        }
    }

    public static void Main( )
    {

        Console.WriteLine( "This example of the decimal( int, int, " +
            "int, bool, byte ) \nconstructor " +
            "generates the following output.\n" );
        Console.WriteLine( "{0,-38}{1,38}", "Constructor", 
            "Value or Exception" );
        Console.WriteLine( "{0,-38}{1,38}", "-----------", 
            "------------------" );

        // Construct decimal objects from the component fields.
        CreateDecimal( 0, 0, 0, false, 0 );
        CreateDecimal( 0, 0, 0, false, 27 );
        CreateDecimal( 0, 0, 0, true, 0 );
        CreateDecimal( 1000000000, 0, 0, false, 0 );
        CreateDecimal( 0, 1000000000, 0, false, 0 );
        CreateDecimal( 0, 0, 1000000000, false, 0 );
        CreateDecimal( 1000000000, 1000000000, 1000000000, false, 0 );
        CreateDecimal( -1, -1, -1, false, 0 );
        CreateDecimal( -1, -1, -1, true, 0 );
        CreateDecimal( -1, -1, -1, false, 15 );
        CreateDecimal( -1, -1, -1, false, 28 );
        CreateDecimal( -1, -1, -1, false, 29 );
        CreateDecimal( int.MaxValue, 0, 0, false, 18 );
        CreateDecimal( int.MaxValue, 0, 0, false, 28 );
        CreateDecimal( int.MaxValue, 0, 0, true, 28 );
    }
}

/*
This example of the decimal( int, int, int, bool, byte )
constructor generates the following output.

Constructor                                               Value or Exception
-----------                                               ------------------
decimal( 0, 0, 0, False, 0 )                                               0
decimal( 0, 0, 0, False, 27 )                                              0
decimal( 0, 0, 0, True, 0 )                                                0
decimal( 1000000000, 0, 0, False, 0 )                             1000000000
decimal( 0, 1000000000, 0, False, 0 )                    4294967296000000000
decimal( 0, 0, 1000000000, False, 0 )          18446744073709551616000000000
decimal( 1000000000, 1000000000, 1000000000, False, 0 )
                                               18446744078004518913000000000
decimal( -1, -1, -1, False, 0 )                79228162514264337593543950335
decimal( -1, -1, -1, True, 0 )                -79228162514264337593543950335
decimal( -1, -1, -1, False, 15 )              79228162514264.337593543950335
decimal( -1, -1, -1, False, 28 )              7.9228162514264337593543950335
decimal( -1, -1, -1, False, 29 )                 ArgumentOutOfRangeException
decimal( 2147483647, 0, 0, False, 18 )                  0.000000002147483647
decimal( 2147483647, 0, 0, False, 28 )        0.0000000000000000002147483647
decimal( 2147483647, 0, 0, True, 28 )        -0.0000000000000000002147483647
*/

The following example uses the M:System.Decimal.GetBits(System.Decimal) method to retrieve the component parts of an array. It then uses this array in the call to the M:System.Decimal.#ctor(System.Int32,System.Int32,System.Int32,System.Boolean,System.Byte) constructor to instantiate a new T:System.Decimal value.

using System;

public class Example
{
   public static void Main()
   {
      Decimal[] values = { 1234.96m, -1234.96m };
      foreach (var value in values) {
         int[] parts = Decimal.GetBits(value);
         bool sign = (parts[3] & 0x80000000) != 0;

         byte scale = (byte) ((parts[3] >> 16) & 0x7F); 
         Decimal newValue = new Decimal(parts[0], parts[1], parts[2], sign, scale);
         Console.WriteLine("{0} --> {1}", value, newValue);
      }
   }
}
// The example displays the following output:
//       1234.96 --> 1234.96
//       -1234.96 --> -1234.96

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