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XAttribute Explicit Conversion (XAttribute to Nullable<Boolean>)

Cast the value of this XAttribute 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> (
	XAttribute attribute
)

Parameters

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.

ExceptionCondition
FormatException

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

.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

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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