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XmlAttributeEventArgs Class

Provides data for the UnknownAttribute event.

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

public class XmlAttributeEventArgs : EventArgs

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>
using System;
using System.IO;
using System.Xml.Serialization;
using System.Xml;
using System.Xml.Schema;

public class Group{
   public string GroupName;
}

public class Test{
   static void Main(){
      Test t = new Test();
      // Deserialize the file containing unknown elements.
      t.DeserializeObject("UnknownAttributes.xml");
   }
   private void Serializer_UnknownAttribute(object sender, XmlAttributeEventArgs e){
      Console.WriteLine("Unknown Attribute");
      Console.WriteLine("\t" + e.Attr.Name + " " + e.Attr.InnerXml);
      Console.WriteLine("\t LineNumber: " + e.LineNumber);
      Console.WriteLine("\t LinePosition: " + e.LinePosition);

      Group x  = (Group) e.ObjectBeingDeserialized;
      Console.WriteLine (x.GroupName);
      Console.WriteLine (sender.ToString());
   }
   private void DeserializeObject(string filename){
      XmlSerializer ser = new XmlSerializer(typeof(Group));
      // Add a delegate to handle unknown element events.
      ser.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();
   	}
}
#using <mscorlib.dll>
#using <System.Xml.dll>
#using <System.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml::Serialization;
using namespace System::Xml;
using namespace System::Xml::Schema;

public __gc class Group{
public:
   String* GroupName;
};

public __gc class Test{
public:
   static void main(){
      Test* t = new Test();
      // Deserialize the file containing unknown elements.
      t->DeserializeObject(S"UnknownAttributes.xml");
   }
private:
   void Serializer_UnknownAttribute(Object* sender, XmlAttributeEventArgs* e){
      Console::WriteLine(S"Unknown Attribute");
      Console::WriteLine(S"\t{0} {1}", e->Attr->Name, e->Attr->InnerXml);
      Console::WriteLine(S"\t LineNumber: {0}", __box(e->LineNumber));
      Console::WriteLine(S"\t LinePosition: {0}", __box(e->LinePosition));

      Group* x  = dynamic_cast<Group*> (e->ObjectBeingDeserialized);
      Console::WriteLine (x->GroupName);
      Console::WriteLine (sender);
   }
private:
   void DeserializeObject(String* filename){
      XmlSerializer* ser = new XmlSerializer(__typeof(Group));
      // Add a delegate to handle unknown element events.
      ser->UnknownAttribute+=new XmlAttributeEventHandler(this, &Test::Serializer_UnknownAttribute);
      // A FileStream is needed to read the XML document.
      FileStream* fs = new FileStream(filename, FileMode::Open);
      Group* g = dynamic_cast<Group*> (ser->Deserialize(fs));
      fs->Close();
   }
};

int main()
{
   Test::main();
}

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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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