XmlNodeEventHandler XmlNodeEventHandler XmlNodeEventHandler XmlNodeEventHandler Delegate

Definizione

Rappresenta il metodo di gestione dell'evento UnknownNode di un oggetto XmlSerializer.Represents the method that handles the UnknownNode event of an XmlSerializer.

public delegate void XmlNodeEventHandler(System::Object ^ sender, XmlNodeEventArgs ^ e);
public delegate void XmlNodeEventHandler(object sender, XmlNodeEventArgs e);
type XmlNodeEventHandler = delegate of obj * XmlNodeEventArgs -> unit
Public Delegate Sub XmlNodeEventHandler(sender As Object, e As XmlNodeEventArgs)

Parametri

sender
Object Object Object Object

Origine dell'evento.The source of the event.

e
XmlNodeEventArgs XmlNodeEventArgs XmlNodeEventArgs XmlNodeEventArgs

Oggetto XmlNodeEventArgs che contiene i dati dell'evento.An XmlNodeEventArgs that contains the event data.

Ereditarietà
XmlNodeEventHandlerXmlNodeEventHandlerXmlNodeEventHandlerXmlNodeEventHandler

Esempi

Nell'esempio seguente viene creato XmlSerializerun oggetto, viene aggiunto un gestore UnknownNode eventi per l'evento e viene deserializzato un oggetto.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 = gcnew XmlSerializer( ObjectToDeserialize::typeid );

      // Add an instance of the delegate to the event.
      mySerializer->UnknownNode += gcnew XmlNodeEventHandler( this, &Class1::Serializer_UnknownNode );

      // A FileStream is needed to read the file to deserialize.
      FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
      ObjectToDeserialize^ o = dynamic_cast<ObjectToDeserialize^>(mySerializer->Deserialize( fs ));
   }

   void Serializer_UnknownNode( Object^ sender, XmlNodeEventArgs^ e )
   {
      Console::WriteLine( "UnknownNode Name: {0}", e->Name );
      Console::WriteLine( "UnknownNode LocalName: {0}", e->LocalName );
      Console::WriteLine( "UnknownNode Namespace URI: {0}", e->NamespaceURI );
      Console::WriteLine( "UnknownNode Text: {0}", e->Text );
      Object^ o = e->ObjectBeingDeserialized;
      Console::WriteLine( "Object being deserialized {0}", o );
      XmlNodeType myNodeType = e->NodeType;
      Console::WriteLine( myNodeType );
   }

private void DeserializeItem(string filename) {
    XmlSerializer mySerializer = 
        new XmlSerializer(typeof(ObjectToDeserialize));
    // Add an instance of the delegate to the event.
    mySerializer.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);
}
 
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;
    Console.WriteLine(myNodeType);
}

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


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

Commenti

Quando si crea un XmlNodeEventHandler delegato, si identifica il metodo che gestisce l'evento.When you create an XmlNodeEventHandler delegate, you identify the method that handles the event. Per associare l'evento al gestore eventi in uso, aggiungere all'evento un'istanza del delegato.To associate the event with your event handler, add an instance of the delegate to the event. Il gestore eventi viene chiamato ogni volta che si verifica l'evento, a meno che non venga rimosso il delegato.The event handler is called whenever the event occurs, unless you remove the delegate. Per ulteriori informazioni sui delegati del gestore eventi, vedere gestione e generazione di eventi.For more information about event handler delegates, see Handling and Raising Events.

L' UnknownNode evento si verifica solo quando si chiama Deserialize il metodo.The UnknownNode event occurs only when you call the Deserialize method.

Metodi di estensione

GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate)

Ottiene un oggetto che rappresenta il metodo rappresentato dal delegato specificato.Gets an object that represents the method represented by the specified delegate.

Si applica a

Vedi anche