XAttribute Explicit Conversion (XAttribute to Nullable<Boolean>)

equivalentCodeEntityop_Explicit(XAttribute attribute)

Cast the value of this XAttribute 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> (
	XAttribute attribute


Type: System.Xml.Linq.XAttribute

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

Return Value

Type: System.Nullable<Boolean>

A Nullable<T> of Boolean that contains the content of this XAttribute.

Exception Condition

The attribute does not contain a valid Boolean value.

When converting to 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 attribute with Boolean content. It then retrieves the value by casting to Nullable<T> of Boolean.

                XElement root = new XElement("Root", 
    new XAttribute("BoolValue1", true),
    new XAttribute("BoolValue2", false)
bool? bool1 = (bool?)root.Attribute("BoolValue1");
bool? bool2 = (bool?)root.Attribute("BoolValue2");
Console.WriteLine("Nullable boolean: BoolValue1={0}", bool1);
Console.WriteLine("Nullable boolean: BoolValue2={0}", bool2);

This example produces the following output:

Nullable boolean: BoolValue1=True
Nullable boolean: BoolValue2=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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