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XElement Explicit Conversion (XElement to Nullable<UInt64>)

Cast the value of this XElement to a Nullable<T> of UInt64.

This API is not CLS-compliant. 

Namespace:  System.Xml.Linq
Assembly:  System.Xml.Linq (in System.Xml.Linq.dll)

public static explicit operator Nullable<ulong> (
	XElement element
)

Parameters

element
Type: System.Xml.Linq.XElement

The XElement to cast to Nullable<T> of UInt64.

Return Value

Type: System.Nullable<UInt64>
A Nullable<T> of UInt64 that contains the content of this XElement.

ExceptionCondition
FormatException

The element does not contain a valid UInt64 value.

The following example creates an element with unsigned long integer content. It then retrieves the value by casting to Nullable<T> of UInt64.

XElement root = new XElement("Root", 
    new XElement("Value", 9223372036854775807)
);
ulong? value = (ulong?)root.Element("Value");
Console.WriteLine("Nullable ulong: value={0}", value == null ? "null" : value.ToString());

This example produces the following output:

Nullable ulong: value=9223372036854775807

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0

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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