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Explicit Conversion (XElement to Nullable(Boolean))

XElement Explicit Conversion (XElement to Nullable<Boolean>)

Cast the value of this XElement to a Nullable<T> of Boolean.

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<bool> (
	XElement element
)

Parameters

element
Type: System.Xml.Linq.XElement

The XElement to cast to Nullable<T> of Boolean.

Return Value

Type: System.Nullable<Boolean>
A Nullable<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<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<T> of Boolean.

XElement root = new XElement("Root", 
    new XElement("BoolValue1", true),
    new XElement("BoolValue2", false));
bool? bool1 = (bool?)root.Element("BoolValue1");
bool? bool2 = (bool?)root.Element("BoolValue2");
Console.WriteLine("Nullable Boolean: value1={0}", bool1);
Console.WriteLine("Nullable Boolean: value2={0}", bool2);

This example produces the following output:

Nullable Boolean: value1=True
Nullable Boolean: value2=False

.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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