Decimal Narrowing Conversion (Double to Decimal)

Converts a double-precision floating-point number to a Decimal.

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

'Declaration
Public Shared Narrowing Operator CType ( _
	value As Double _
) As Decimal

Parameters

value
Type: System.Double
A double-precision floating-point number.

Return Value

Type: System.Decimal
A Decimal that represents the converted double-precision floating point number.

ExceptionCondition
OverflowException

value is less than MinValue or greater than MaxValue.

-or-

value is Double.NaN, Double.PositiveInfinity, or Double.NegativeInfinity.

The following code example converts Double values to Decimal numbers using the Double to Decimal conversion. This conversion requires the op_Explicit operator in Visual Basic.


' Example of the explicit conversion from Double to Decimal.

Module Example

   Const formatter As String = "{0,25:E16}{1,33}"

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

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

   ' Convert the Double argument; catch exceptions that are thrown.
   Sub DecimalFromDouble(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal argument As Double)

      Dim decValue As Object

      ' Convert the Double argument to a Decimal value.
      Try
         decValue = Decimal.op_Explicit(argument)
      Catch ex As Exception
         decValue = GetExceptionType(ex)
      End Try

      ' Display the Decimal.
      outputBlock.Text &= String.Format(formatter, argument, decValue) & vbCrLf
   End Sub

   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      outputBlock.Text &= _
          "This example of the explicit conversion from Double " & _
          "to Decimal " & vbCrLf & "generates the following " & _
          "output." & vbCrLf & vbCrLf
      outputBlock.Text &= String.Format(formatter, "Double argument", _
          "Decimal value") & vbCrLf
      outputBlock.Text &= String.Format(formatter, "---------------", _
          "-------------") & vbCrLf

      ' Convert Double values and display the results.
      DecimalFromDouble(outputBlock, 1.234567890123E-30)
      DecimalFromDouble(outputBlock, 1.2345678901234E-25)
      DecimalFromDouble(outputBlock, 1.23456789012345E-20)
      DecimalFromDouble(outputBlock, 0.0000000001234567890123456)
      DecimalFromDouble(outputBlock, 1.2345678901234567)
      DecimalFromDouble(outputBlock, 1234567890123.4568)
      DecimalFromDouble(outputBlock, 1.2345678901234568E+28)
      DecimalFromDouble(outputBlock, 1.2345678901234568E+30)
   End Sub
End Module

' This example of the explicit conversion from Double to Decimal
' generates the following output.
'
'           Double argument                    Decimal value
'           ---------------                    -------------
'   1.2345678901230000E-030                                0
'   1.2345678901233999E-025   0.0000000000000000000000001235
'   1.2345678901234499E-020   0.0000000000000000000123456789
'   1.2345678901234560E-010       0.000000000123456789012346
'   1.2345678901234567E+000                 1.23456789012346
'   1.2345678901234568E+012                 1234567890123.46
'   1.2345678901234568E+028    12345678901234600000000000000
'   1.2345678901234569E+030                OverflowException


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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