XmlNodeEventHandler Delegate
Assembly: System.Xml (in system.xml.dll)
'Declaration Public Delegate Sub XmlNodeEventHandler ( _ sender As Object, _ e As XmlNodeEventArgs _ ) 'Usage Dim instance As New XmlNodeEventHandler(AddressOf HandlerMethod)
/** @delegate */ public delegate void XmlNodeEventHandler ( Object sender, XmlNodeEventArgs e )
JScript supports the use of delegates, but not the declaration of new ones.
Parameters
- sender
The source of the event.
- e
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 Sub DeserializeItem(ByVal filename As String) Dim mySerializer As New XmlSerializer(GetType(ObjectToDeserialize)) ' Add an instance of the delegate to the event. AddHandler mySerializer.UnknownNode, AddressOf Serializer_UnknownNode ' A FileStream is needed to read the file to deserialize. Dim fs As New FileStream(filename, FileMode.Open) Dim o As ObjectToDeserialize = _ CType(mySerializer.Deserialize(fs), ObjectToDeserialize) End Sub 'DeserializeItem Private Sub Serializer_UnknownNode _ (ByVal sender As Object, _ ByVal e As XmlNodeEventArgs) 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) Dim o As Object = e.ObjectBeingDeserialized Console.WriteLine("Object being deserialized " & o.ToString()) Dim myNodeType As XmlNodeType = e.NodeType Console.WriteLine(myNodeType) End Sub
private void DeserializeItem(String fileName)
{
XmlSerializer mySerializer =
new XmlSerializer(ObjectToDeserialize.class.ToType());
// Add an instance of the delegate to the event.
mySerializer.add_UnknownNode(
new XmlNodeEventHandler(Serializer_UnknownNode));
// A FileStream is needed to read the file to deserialize.
FileStream fs = new FileStream(fileName, FileMode.Open);
ObjectToDeserialize o =
(ObjectToDeserialize)mySerializer.Deserialize(fs);
} //DeserializeItem
protected void Serializer_UnknownNode(Object sender, XmlNodeEventArgs e)
{
Console.WriteLine("UnknownNode Name: " + e.get_Name());
Console.WriteLine("UnknownNode LocalName: " + e.get_LocalName());
Console.WriteLine("UnknownNode Namespace URI: " + e.get_NamespaceURI());
Console.WriteLine("UnknownNode Text: " + e.get_Text());
Object o = e.get_ObjectBeingDeserialized();
Console.WriteLine("Object being deserialized " + o.ToString());
XmlNodeType myNodeType = e.get_NodeType();
Console.WriteLine(myNodeType);
} //Serializer_UnknownNode
Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.