XmlAttributeEventArgs Class

Provides data for the UnknownAttribute event.

Namespace: System.Xml.Serialization
Assembly: System.Xml (in system.xml.dll)

'Declaration
Public Class XmlAttributeEventArgs
	Inherits EventArgs
'Usage
Dim instance As XmlAttributeEventArgs

public class XmlAttributeEventArgs extends EventArgs
public class XmlAttributeEventArgs extends EventArgs
Not applicable.

For more information about handling events, see Events Overview (Windows Forms).

The UnknownAttribute event occurs only when you call the Deserialize method.

The following example deserializes a class named Group from a file named UnknownAttributes.xml. Whenever an element is found in the file that has no corresponding member in the class, the UnknownAttribute event occurs. To try the example, paste the following XML code into a file named UnknownAttributes.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" GroupType = 'Technical' GroupNumber = '42' GroupBase = 'Red'>
   <GroupName>MyGroup</GroupName>
 </Group>
Imports System
Imports System.IO
Imports System.Xml.Serialization
Imports System.Xml
Imports System.Xml.Schema
Imports Microsoft.VisualBasic

Public Class Group
   Public GroupName As String 
End Class

Public Class Test
   Shared Sub Main()
      Dim t As Test = new Test()
      ' Deserialize the file containing unknown elements.
      t.DeserializeObject("UnknownAttributes.xml")
   End Sub

   Private Sub Serializer_UnknownAttribute _
   (sender As Object , e As XmlAttributeEventArgs)
      Console.WriteLine("Unknown Attribute")
      Console.WriteLine(ControlChars.Tab & e.Attr.Name + " " & e.Attr.InnerXml)
      Console.WriteLine(ControlChars.Tab & e.LineNumber & ":"  & e.LineNumber)
      Console.WriteLine(ControlChars.Tab & e.LinePosition & ":"   & e.LinePosition)
      
      Dim x As Group = CType( e.ObjectBeingDeserialized, Group)
      Console.WriteLine (x.GroupName)
      Console.WriteLine (sender.ToString())
   End Sub
   
   Private Sub DeserializeObject(filename As String)
      Dim ser As XmlSerializer = new XmlSerializer(GetType(Group))
      ' Add a delegate to handle unknown element events.
      AddHandler ser.UnknownAttribute, _
      AddressOf Serializer_UnknownAttribute 
      ' A FileStream is needed to read the XML document.
     Dim fs As FileStream  = new FileStream(filename, FileMode.Open)
     Dim g  As Group = CType(ser.Deserialize(fs),Group)
     fs.Close()
   End Sub
End Class

import System.*;
import System.IO.*;
import System.Xml.Serialization.*;
import System.Xml.*;
import System.Xml.Schema.*;

public class Group
{
    public String groupName;
} //Group

public class Test
{
    public static void main(String[] args)
    {
        Test t = new Test();
        // Deserialize the file containing unknown elements.
        t.DeserializeObject("UnknownAttributes.xml");
    } //main

    private void Serializer_UnknownAttribute(Object sender,
        XmlAttributeEventArgs e)
    {
        Console.WriteLine("Unknown Attribute");
        Console.WriteLine("\t" + e.get_Attr().get_Name() + " "
            + e.get_Attr().get_InnerXml());
        Console.WriteLine("\t LineNumber: " + e.get_LineNumber());
        Console.WriteLine("\t LinePosition: " + e.get_LinePosition());

        Group x = (Group)e.get_ObjectBeingDeserialized();
        Console.WriteLine(x.groupName);
        Console.WriteLine(sender.ToString());
    } //Serializer_UnknownAttribute

    private void DeserializeObject(String filename)
    {
        XmlSerializer ser = new XmlSerializer(Group.class.ToType());

        // Add a delegate to handle unknown element events.
        ser.add_UnknownAttribute(new XmlAttributeEventHandler
            (Serializer_UnknownAttribute));

        // A FileStream is needed to read the XML document.
        FileStream fs = new FileStream(filename, FileMode.Open);
        Group g = (Group)ser.Deserialize(fs);
        fs.Close();
    } //DeserializeObject
} //Test

System.Object
   System.EventArgs
    System.Xml.Serialization.XmlAttributeEventArgs

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

XNA Framework

Supported in: 1.0

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