XmlSerializer.UnknownElement Événement

public:
 event System::Xml::Serialization::XmlElementEventHandler ^ UnknownElement;

public event System.Xml.Serialization.XmlElementEventHandler UnknownElement;

member this.UnknownElement : System.Xml.Serialization.XmlElementEventHandler 

Public Custom Event UnknownElement As XmlElementEventHandler 

Type d'événement

Exemples

L’exemple suivant désérialise une classe nommée Group à partir d’un fichier nommé UnknownElements.xml. Chaque fois qu’un élément est trouvé dans le fichier qui n’a aucun membre correspondant dans la classe, l’événement UnknownElement se produit. Pour essayer l’exemple, collez le code XML suivant dans un fichier nommé UnknownElements.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">
  <GroupName>MyGroup</GroupName>
  <GroupSize>Large</GroupSize>
  <GroupNumber>444</GroupNumber>
  <GroupBase>West</GroupBase>
</Group>

#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 ref class Group
{
public:
   String^ GroupName;
};

public ref class Test
{
private:
   void Serializer_UnknownElement( Object^ sender, XmlElementEventArgs^ e )
   {
      Console::WriteLine( "Unknown Element" );
      Console::Write( "\t {0}", e->Element->Name );
      Console::WriteLine( " {0}", e->Element->InnerXml );
      Console::WriteLine( "\t LineNumber: {0}", e->LineNumber );
      Console::WriteLine( "\t LinePosition: {0}", e->LinePosition );
      Group^ x = dynamic_cast<Group^>(e->ObjectBeingDeserialized);
      Console::WriteLine( x->GroupName );
      Console::WriteLine( sender );
   }

public:
   void DeserializeObject( String^ filename )
   {
      XmlSerializer^ ser = gcnew XmlSerializer( Group::typeid );

      // Add a delegate to handle unknown element events.
      ser->UnknownElement += gcnew XmlElementEventHandler( this, &Test::Serializer_UnknownElement );

      // A FileStream is needed to read the XML document.
      FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
      Group^ g = dynamic_cast<Group^>(ser->Deserialize( fs ));
      fs->Close();
   }
};

int main()
{
   Test^ t = gcnew Test;

   // Deserialize the file containing unknown elements.
   t->DeserializeObject( "UnknownElements.xml" );
}

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("UnknownElements.xml");
   }
   private void Serializer_UnknownElement(object sender, XmlElementEventArgs e){
      Console.WriteLine("Unknown Element");
      Console.WriteLine("\t" + e.Element.Name + " " + e.Element.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.UnknownElement+=new XmlElementEventHandler(Serializer_UnknownElement);
      // A FileStream is needed to read the XML document.
     FileStream fs = new FileStream(filename, FileMode.Open);
     Group g = (Group) ser.Deserialize(fs);
     fs.Close();
    }
}

Imports System.IO
Imports System.Xml.Serialization
Imports System.Xml
Imports System.Xml.Schema

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("UnknownElements.xml")
   End Sub

   Private Sub Serializer_UnknownElement _
   (sender As Object , e As XmlElementEventArgs)
      Console.WriteLine("Unknown Element")
      Console.WriteLine(ControlChars.Tab & e.Element.Name + " " & e.Element.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.UnknownElement, _
      AddressOf Serializer_UnknownElement 
      ' 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

Remarques

Par défaut, après avoir appelé la Deserialize méthode , ignore XmlSerializer les attributs XML de types inconnus. Toutefois, vous pouvez utiliser cet événement pour gérer ces types de nœuds.

S’applique à

Voir aussi

• XmlAnyElementAttribute
• UnknownNode
• UnknownAttribute
• XmlAttributes
• Introduction à la sérialisation XML
• Comment : spécifier un nom d'élément différent pour un flux XML
• Contrôle de la sérialisation XML à l'aide d'attributs
• Exemples de sérialisation XML
• Outil XML Schema Definition (Xsd.exe)