XElement Explicit Conversion (XElement to Nullable<Boolean>)


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

This API is not CLS-compliant.

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

public static explicit operator Nullable<bool> (
	XElement 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.

Exception Condition

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

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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