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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
Assembly:  System.Xml.Linq (in System.Xml.Linq.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, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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