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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.


StringBuilder output = new StringBuilder();
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");
output.Append("Nullable boolean: BoolValue1=" + bool1);
output.Append(Environment.NewLine);
output.Append("Nullable boolean: BoolValue2=" + bool2);
output.Append(Environment.NewLine);

OutputTextBlock.Text = output.ToString();


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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