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Convert.ToUInt64 Method (Single)

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

This API is not CLS-compliant. 

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

[CLSCompliantAttribute(false)]
public static ulong ToUInt64(
	float value
)

Parameters

value
Type: System.Single

The single-precision floating-point number to convert.

Return Value

Type: System.UInt64
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.

ExceptionCondition
OverflowException

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

The following example attempts to convert each element in an array of Single values to an unsigned long integer. The output shows that fractional values are rounded before the conversion is performed.

float[] values= { Single.MinValue, -1.38e10f, -1023.299f, -12.98f,
                  0f, 9.113e-16f, 103.919f, 17834.191f, Single.MaxValue };
ulong result;

foreach (float value in values)
{
   try {
      result = Convert.ToUInt64(value);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        value.GetType().Name, value, result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the UInt64 type.", value);
   }   
}                                 
// The example displays the following output: 
//    -3.402823E+38 is outside the range of the UInt64 type. 
//    -1.38E+10 is outside the range of the UInt64 type. 
//    -1023.299 is outside the range of the UInt64 type. 
//    -12.98 is outside the range of the UInt64 type. 
//    Converted the Single value 0 to the UInt64 value 0. 
//    Converted the Single value 9.113E-16 to the UInt64 value 0. 
//    Converted the Single value 103.919 to the UInt64 value 104. 
//    Converted the Single value 17834.19 to the UInt64 value 17834. 
//    3.402823E+38 is outside the range of the UInt64 type.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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