XElement Narrowing Conversion (XElement to Nullable(Of Int64))

Cast the value of this XElement to a Nullable(Of 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)

'Declaration
Public Shared Narrowing Operator CType ( _
	element As XElement _
) As Nullable(Of Long)

Parameters

element
Type: System.Xml.Linq.XElement

The XElement to cast to Nullable(Of T) of Int64.

Return Value

Type: System.Nullable(Of Int64)
A Nullable(Of T) of Int64 that contains the content of this XElement.

ExceptionCondition
FormatException

The element does not contain a valid Int64 value.

The following example creates an element with long integer content. It then retrieves the value by casting to Nullable(Of T) of Int64.

Dim root As XElement = _ 
        <Root>
            <Value>9223372036854775807</Value>
        </Root>
Dim value As Nullable(Of ULong) = CType(root.Element("Value"), 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

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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