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XmlNodeEventHandler Delegate

Represents the method that handles the UnknownNode event of an XmlSerializer.

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

public delegate void XmlNodeEventHandler(
	Object sender,
	XmlNodeEventArgs e


Type: System.Object

The source of the event.

Type: System.Xml.Serialization.XmlNodeEventArgs

An XmlNodeEventArgs that contains the event data.

When you create an XmlNodeEventHandler delegate, you identify the method that handles the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Events and Delegates.

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

The following example creates an XmlSerializer, adds an event handler for the UnknownNode event, and deserializes an object.

private void DeserializeItem(string filename) {
    XmlSerializer mySerializer = 
        new XmlSerializer(typeof(ObjectToDeserialize));
    // Add an instance of the delegate to the event.
    mySerializer.UnknownNode += new XmlNodeEventHandler
    // A FileStream is needed to read the file to deserialize.
    FileStream fs = new FileStream(filename, FileMode.Open);
    ObjectToDeserialize o = (ObjectToDeserialize)mySerializer.Deserialize(fs);

private void Serializer_UnknownNode
    (object sender, XmlNodeEventArgs e) {

    Console.WriteLine("UnknownNode Name: "
                      + e.Name);
    Console.WriteLine("UnknownNode LocalName: "
                      + e.LocalName);
    Console.WriteLine("UnknownNode Namespace URI: "
                      + e.NamespaceURI);
    Console.WriteLine("UnknownNode Text: "
                      + e.Text);

    object o = e.ObjectBeingDeserialized;
    Console.WriteLine("Object being deserialized " 
                      + o.ToString());

    XmlNodeType myNodeType = e.NodeType;
    void DeserializeItem(String* filename) {
        XmlSerializer* mySerializer = 
            new XmlSerializer(__typeof(ObjectToDeserialize));
        // Add an instance of the delegate to the event.
        mySerializer->UnknownNode += new XmlNodeEventHandler(this, &Class1::Serializer_UnknownNode);
        // A FileStream is needed to read the file to deserialize.
        FileStream* fs = new FileStream(filename, FileMode::Open);
        ObjectToDeserialize* o = dynamic_cast<ObjectToDeserialize*>(mySerializer->Deserialize(fs));

    void Serializer_UnknownNode(Object* sender, XmlNodeEventArgs* e) {

        Console::WriteLine(S"UnknownNode Name: {0}", e->Name);
        Console::WriteLine(S"UnknownNode LocalName: {0}", e->LocalName);
        Console::WriteLine(S"UnknownNode Namespace URI: {0}", e->NamespaceURI);
        Console::WriteLine(S"UnknownNode Text: {0}", e->Text);

        Object* o = e->ObjectBeingDeserialized;
        Console::WriteLine(S"Object being deserialized {0}", o);

        XmlNodeType myNodeType = e->NodeType;

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