# Decimal ExplicitNarrowingExplicitExplicit Conversion (Decimal to Int64)

Converts a Decimal to a 64-bit signed integer.

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

## Syntax

``````Public Shared Narrowing Operator CType ( _
value As Decimal _
) As Long
``````
``````public static explicit operator long (
decimal value
)
``````

#### Return Value

Type: System..::.Int64
A 64-bit signed integer that represents the converted Decimal.

## Exceptions

Exception Condition
OverflowException

value is less than Int64..::.MinValue or greater than Int64..::.MaxValue.

## Remarks

This operator supports the explicit conversion of a Decimal to a Int64. The syntax for such explicit conversions is language-dependent, and individual language compilers can provide different implementations and return different results. The example illustrates the different return values when you explicitly convert a Decimal value to an Int64 value by using C# and Visual Basic. To perform a conversion that is independent of language, you can call the ToInt64 or the Convert..::.ToInt64(Decimal) method.

## Examples

The following code example converts Decimal numbers to Int64 values using the explicit Decimal to Int64 conversion.

``````' Example of the explicit conversions from Decimal to Long and
' Decimal to ULong.
Module Example

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

' Convert the decimal argument catch exceptions that are thrown.
Public Sub DecimalToU_Int64(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal argument As Decimal)
Dim Int64Value As Object
Dim UInt64Value As Object

' Convert the argument to a long value.
Try
Int64Value = CLng(argument)
Catch ex As Exception
Int64Value = ex.GetType().Name
End Try

' Convert the argument to a ulong value.
Try
UInt64Value = CULng(argument)
Catch ex As Exception
UInt64Value = ex.GetType().Name
End Try

outputBlock.Text += String.Format(formatter, argument, _
Int64Value, UInt64Value) + vbCrLf
End Sub

Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
outputBlock.Text += String.Format(formatter, "Decimal argument", _
"Long/Exception", "ULong/Exception") + vbCrLf
outputBlock.Text += String.Format(formatter, "----------------", _
"--------------", "---------------") + vbCrLf

' Convert decimal values and display the results.
DecimalToU_Int64(outputBlock, 123D)
DecimalToU_Int64(outputBlock, New Decimal(123000, 0, 0, False, 3))
DecimalToU_Int64(outputBlock, 123.999D)
DecimalToU_Int64(outputBlock, 18446744073709551615.999D)
DecimalToU_Int64(outputBlock, 18446744073709551616D)
DecimalToU_Int64(outputBlock, 9223372036854775807.999D)
DecimalToU_Int64(outputBlock, 9223372036854775808D)
DecimalToU_Int64(outputBlock, -0.999D)
DecimalToU_Int64(outputBlock, -1D)
DecimalToU_Int64(outputBlock, -9223372036854775808.999D)
DecimalToU_Int64(outputBlock, -9223372036854775809D)
End Sub
End Module
' The example displays the following output:
'             Decimal argument        Long/Exception       ULong/Exception
'             ----------------        --------------       ---------------
'                          123                   123                   123
'                      123.000                   123                   123
'                      123.999                   124                   124
'     18446744073709551615.999     OverflowException     OverflowException
'         18446744073709551616     OverflowException     OverflowException
'      9223372036854775807.999     OverflowException   9223372036854775808
'          9223372036854775808     OverflowException   9223372036854775808
'                       -0.999                    -1     OverflowException
'                           -1                    -1     OverflowException
'     -9223372036854775808.999     OverflowException     OverflowException
'         -9223372036854775809     OverflowException     OverflowException
``````
``````// Example of the explicit conversions from decimal to long and
// decimal to ulong.
using System;

class Example
{
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(System.Windows.Controls.TextBlock outputBlock, decimal argument)
{
object Int64Value;
object UInt64Value;

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

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

outputBlock.Text += String.Format(formatter, argument,
Int64Value, UInt64Value) + "\n";
}

public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
outputBlock.Text += String.Format(
"This example of the explicit conversions from decimal " +
"to long \nand decimal to ulong generates the following " +
"output. It displays \nseveral converted decimal " +
"values.\n") + "\n";
outputBlock.Text += String.Format(formatter, "decimal argument",
"long/exception", "ulong/exception") + "\n";
outputBlock.Text += String.Format(formatter, "----------------",
"--------------", "---------------") + "\n";

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

/*
This example of the explicit conversions from decimal to long
and decimal to ulong 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
*/
``````

## Version Information

#### Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone