# Decimal.ToInt64 Method (Decimal)

.NET Framework (current version)

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Converts the value of the specified Decimal to the equivalent 64-bit signed integer.

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

## Syntax

```public static long ToInt64(
decimal d
)
```

#### Parameters

d
Type: System.Decimal

The decimal number to convert.

#### Return Value

Type: System.Int64

A 64-bit signed integer equivalent to the value of d.

## Exceptions

Exception Condition
OverflowException

d is less than Int64.MinValue or greater than Int64.MaxValue.

## Remarks

The return value is the integral part of the decimal value; fractional digits are truncated.

You can also convert a Decimal value to a 64-bit integer by using the Explicit(Decimal to Int64) assignment operator. Because the operator performs a narrowing conversion, you must use a casting operator in C# or a conversion function in Visual Basic.

## Examples

The following example uses the ToInt64 method to convert decimal numbers to Int64 values.

```using System;

class Example
{
public static void Main( )
{
decimal[] values = { 123m, new Decimal(123000, 0, 0, false, 3),
123.999m, 18446744073709551615.999m,
18446744073709551616m, 9223372036854775807.999m,
9223372036854775808m, -0.999m, -1m,
-9223372036854775808.999m,
-9223372036854775809m };

foreach (var value in values) {
try {
long number = Decimal.ToInt64(value);
Console.WriteLine("{0} --> {1}", value, number);
}
catch (OverflowException e)
{
Console.WriteLine("{0}: {1}", e.GetType().Name, value);
}
}
}
}
// The example displays the following output:
//   123 --> 123
//   123.000 --> 123
//   123.999 --> 123
//   OverflowException: 18446744073709551615.999
//   OverflowException: 18446744073709551616
//   9223372036854775807.999 --> 9223372036854775807
//   OverflowException: 9223372036854775808
//   -0.999 --> 0
//   -1 --> -1
//   -9223372036854775808.999 --> -9223372036854775808
//   OverflowException: -9223372036854775809
```

## Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1