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Convert.ToUInt64 Method (Double)

Converts the value of the specified double-precision floating point number to an equivalent 64-bit unsigned integer.

This method is not CLS-compliant.  

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

public static ulong ToUInt64 (
	double value
/** @attribute CLSCompliantAttribute(false) */ 
public static UInt64 ToUInt64 (
	double value
public static function ToUInt64 (
	value : double
) : ulong



A double-precision floating point number.

Return Value

value rounded to the nearest 64-bit unsigned integer. If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

Exception typeCondition


value is less than zero or greater than UInt64.MaxValue.

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

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0