XmlRootAttribute.IsNullable Property
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Gets or sets a value that indicates whether the XmlSerializer must serialize a member that is set to nulla null reference (Nothing in Visual Basic) into the xsi:nil attribute set to true.
Namespace: System.Xml.Serialization
Assembly: System.Xml (in System.Xml.dll)
Syntax
'Declaration
Public Property IsNullable As Boolean
public bool IsNullable { get; set; }
Property Value
Type: System.Boolean
true if the XmlSerializer generates the xsi:nil attribute; otherwise, false.
Remarks
The XML schema specification for structures allows an XML document to explicitly signal that an element's content is missing. Such an element contains the attribute xsi:nil set to true. For more information, see the http://www.w3.org/TR/xmlschema-1/ specification, XML Schema Part 1: Structures.
If the IsNullable property is set to true, the xsi:nil attribute is generated as shown in the following XML.
<?xml version="1.0" encoding="utf-8"?>
<Group xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:nil="true" />
If the IsNullable property is false, an empty element is created as shown in the following code.
<?xml version="1.0" encoding="utf-8"?>
<Group xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" />
Examples
The following example serializes a class named Group. The example applies the XmlRootAttribute to the class, and sets the IsNullable property to false.
Version Information
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
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.