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XAttribute Explicit Conversion (XAttribute to Nullable<Int64>)

Cast the value of this XAttribute to a Nullable<T> of Int64.

This API is not CLS-compliant. 

Namespace:  System.Xml.Linq
Assemblies:   System.Xml.Linq (in System.Xml.Linq.dll)
  System.Xml.XDocument (in System.Xml.XDocument.dll)

public static explicit operator Nullable<long> (
	XAttribute attribute
)

Parameters

attribute
Type: System.Xml.Linq.XAttribute

The XAttribute to cast to a Nullable<T> of Int64.

Return Value

Type: System.Nullable<Int64>
A Nullable<T> of Int64 that contains the content of this XAttribute.

ExceptionCondition
FormatException

The attribute does not contain a valid Int64 value.

The following example creates an attribute with long integer content. It then retrieves the value by casting to Nullable<T> of Int64.

XElement root = new XElement("Root", 
    new XAttribute("Att", 9223372036854775807)
);
long? value = (long?)root.Attribute("Att");
Console.WriteLine("Nullable long: value={0}", value == null ? "null" : value.ToString());

This example produces the following output:

Nullable long: 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

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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