XElement Narrowing Conversion (XElement to Nullable(Of Boolean))
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Cast the value of this XElement to a Nullable(Of T) of Boolean.
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.
| Exception | Condition |
|---|---|
| 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.