Gets or sets a value that indicates whether the XmlSerializer must serialize a member that is set to Nothing into the xsi:nil attribute set to true.
Assembly: System.Xml (in System.Xml.dll)
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 named XML Schema Part 1: Structures.
If the 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 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" />
The following example serializes a class named Group. The example applies the XmlRootAttribute to the class, and sets the property to false.
Imports System Imports System.IO Imports System.Xml.Serialization Imports System.Xml ' Apply the XmlRootAttribute and set the IsNullable property to false. <XmlRoot(IsNullable := False)> _ Public Class Group Public Name As String End Class Public Class Run Public Shared Sub Main() Console.WriteLine("Running") Dim test As New Run() test.SerializeObject("NullDoc.xml") End Sub Public Sub SerializeObject(ByVal filename As String) Dim s As New XmlSerializer(GetType(Group)) ' Writing the file requires a TextWriter. Dim writer As New StreamWriter(filename) ' Create the object to serialize. Dim mygroup As Group = Nothing ' Serialize the object, and close the TextWriter. s.Serialize(writer, mygroup) writer.Close() End Sub End Class
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, 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.