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

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

This API is not CLS-compliant. 

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

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

Parameters

element
Type: System.Xml.Linq.XElement
The XElement to cast to Nullable(Of T) of Boolean.

Return Value

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

ExceptionCondition
FormatException

The element does not contain a valid Boolean value.

When converting to Nullable(Of T) of Boolean from an attribute or element, allowed values are "0", "1", and any string that produces "true" or "false" after trimming and conversion to lower case.

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

Dim root As XElement = _ 
        <Root>
            <BoolValue1>true</BoolValue1>
            <BoolValue2>false</BoolValue2>
        </Root>


Dim value1 As Nullable(Of Boolean) = CType(root.Element("BoolValue1"), Nullable(Of Boolean))
Dim value2 As Nullable(Of Boolean) = CType(root.Element("BoolValue2"), Nullable(Of Boolean))

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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