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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 API is not CLS-compliant. 

Namespace:  System
Assemblies:   System.Runtime.Extensions (in System.Runtime.Extensions.dll)
  mscorlib (in mscorlib.dll)

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

Parameters

value
Type: System.Double

The double-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 Double values to an unsigned long integer.

double[] values= { Double.MinValue, -1.38e10, -1023.299, -12.98,
                   0, 9.113e-16, 103.919, 17834.191, Double.MaxValue };
ulong result;

foreach (double 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: 
//    -1.79769313486232E+308 is outside the range of the UInt64 type. 
//    -13800000000 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 Double value '0' to the UInt64 value 0. 
//    Converted the Double value '9.113E-16' to the UInt64 value 0. 
//    Converted the Double value '103.919' to the UInt64 value 104. 
//    Converted the Double value '17834.191' to the UInt64 value 17834. 
//    1.79769313486232E+308 is outside the range of the UInt64 type.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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