Explicit Conversion (XAttribute to Nullable(Boolean))

XAttribute Explicit Conversion (XAttribute to Nullable<Boolean>)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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();


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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