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XAttribute Narrowing Conversion (XAttribute to Nullable(Of UInt64))

Cast the value of this XAttribute to a Nullable(Of T) of UInt64.

This API is not CLS-compliant. 

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

'Declaration
Public Shared Narrowing Operator CType ( _
	attribute As XAttribute _
) As Nullable(Of ULong)

Parameters

attribute
Type: System.Xml.Linq.XAttribute

The XAttribute to cast to a Nullable(Of T) of UInt64.

Return Value

Type: System.Nullable(Of UInt64)
A Nullable(Of T) of UInt64 that contains the content of this XAttribute.

ExceptionCondition
FormatException

The attribute does not contain a valid UInt64 value.

The following example creates an attribute with unsigned long integer content. It then retrieves the value by casting to Nullable(Of T) of UInt64.

Dim root As XElement = <Root Att="9223372036854775807"/>
Dim value As Nullable(Of ULong) = CType(root.Attribute("Att"), Nullable(Of ULong))
Console.WriteLine("Nullable ulong: value={0}", IIf(value.HasValue, value.ToString(), "null"))

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

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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