Csharp/C Sharp/XML LINQ/Event

XObject Event Handling

<source lang="csharp"> using System; using System.Linq; using System.Collections; using System.Collections.Generic; using System.Xml; using System.Xml.Linq; public class MainClass {

   public static void Main() {
       XElement firstParticipant;
       XDocument xDocument = new XDocument(
         new XElement("Books", firstParticipant =
           new XElement("Book",
             new XAttribute("type", "Author"),
             new XElement("FirstName", "J"),
             new XElement("LastName", "R")),
           new XElement("Book",
             new XAttribute("type", "Author"),
             new XElement("FirstName", "E"),
             new XElement("LastName", "B"))));
       Console.WriteLine(xDocument);
       firstParticipant.Changing += new
       EventHandler<XObjectChangeEventArgs>(MyChangingEventHandler);
       firstParticipant.Changed += new
       EventHandler<XObjectChangeEventArgs>(MyChangedEventHandler);
       xDocument.Changed += new
       EventHandler<XObjectChangeEventArgs>(DocumentChangedHandler);
   }
   public static void MyChangingEventHandler(object sender, XObjectChangeEventArgs cea)
   {
     Console.WriteLine("Type of object changing: {0}, Type of change: {1}",
       sender.GetType().Name, cea.ObjectChange);
   }

   public static void MyChangedEventHandler(object sender, XObjectChangeEventArgs cea)
   {
     Console.WriteLine("Type of object changed: {0}, Type of change: {1}",
       sender.GetType().Name, cea.ObjectChange);
   }

   public static void DocumentChangedHandler(object sender, XObjectChangeEventArgs cea)
   {
     Console.WriteLine("Doc: Type of object changed: {0}, Type of change: {1}{2}",
       sender.GetType().Name, cea.ObjectChange, System.Environment.NewLine);
   }    

}

</source>

XObject Event Handling Using Lambda Expressions

<source lang="csharp"> using System; using System.Linq; using System.Collections; using System.Collections.Generic; using System.Xml; using System.Xml.Linq; public class MainClass {

   public static void Main() {
       XElement firstParticipant;
       XDocument xDocument = new XDocument(
         new XElement("Books", firstParticipant =
           new XElement("Book",
             new XAttribute("type", "Author"),
             new XElement("FirstName", "J"),
             new XElement("LastName", "R")),
           new XElement("Book",
             new XAttribute("type", "Author"),
             new XElement("FirstName", "E"),
             new XElement("LastName", "B"))));
       Console.WriteLine("{0}{1}", xDocument, System.Environment.NewLine);
       firstParticipant.Changing += new EventHandler<XObjectChangeEventArgs>(
         (object sender, XObjectChangeEventArgs cea) =>
           Console.WriteLine("Type of object changing: {0}, Type of change: {1}",
             sender.GetType().Name, cea.ObjectChange));
       firstParticipant.Changed += (object sender, XObjectChangeEventArgs cea) =>
         Console.WriteLine("Type of object changed: {0}, Type of change: {1}",
           sender.GetType().Name, cea.ObjectChange);
       xDocument.Changed += (object sender, XObjectChangeEventArgs cea) =>
         Console.WriteLine("Doc: Type of object changed: {0}, Type of change: {1}{2}",
           sender.GetType().Name, cea.ObjectChange, System.Environment.NewLine);

       firstParticipant.Element("FirstName").Value = "Seph";
       Console.WriteLine("{0}{1}", xDocument, System.Environment.NewLine);
   }

}

</source>