XmlSerializer.UnknownAttribute Händelse

public:
 event System::Xml::Serialization::XmlAttributeEventHandler ^ UnknownAttribute;

public event System.Xml.Serialization.XmlAttributeEventHandler UnknownAttribute;

member this.UnknownAttribute : System.Xml.Serialization.XmlAttributeEventHandler 

Public Custom Event UnknownAttribute As XmlAttributeEventHandler 

Händelsetyp

Exempel

I följande exempel skrivs information om okända attribut som påträffas vid deserialisering av ett XML-dokument.

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();
    }
}

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("UnknownAttributes.xml")
   End Sub

   Private Sub Serializer_UnknownAttribute _
   (sender As Object , e As XmlAttributeEventArgs)
      Console.WriteLine("Unknown Attribute")
      Console.WriteLine(ControlChars.Tab & e.Attr.Name + " " & e.Attr.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.UnknownAttribute, _
      AddressOf Serializer_UnknownAttribute 
      ' 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

Kommentarer

När metoden Deserialize har anropats XmlSerializer ignoreras SOM standard XML-attribut av okända typer. Du kan dock använda den här händelsen för att hantera sådana nodtyper.

Om instansen av klassen som deserialiseras innehåller ett fält som returnerar en matris med XmlAttribute objekt och en XmlAnyAttributeAttribute har tillämpats på fältet, UnknownAttribute inträffar inte händelsen. I stället samlas alla okända XML-attribut in i matrisen.

Se även

• XmlAnyAttributeAttribute
• CanDeserialize(XmlReader)
• Deserialize(Stream)
• UnknownNode
• XmlAttributes
• Introduktion till XML-serialisering
• Anvisningar: Ange ett alternativt elementnamn för en XML-dataström
• Kontrollera XML-serialisering med hjälp av attribut
• Exempel på XML-serialisering
• XML-schemadefinitionsverktyg (Xsd.exe)