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XmlNodeChangedEventHandler Delegate

Represents the method that handles NodeChanged, NodeChanging, NodeInserted, NodeInserting, NodeRemoved and NodeRemoving events.

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)

public delegate void XmlNodeChangedEventHandler(
	Object sender,
	XmlNodeChangedEventArgs e
)

Parameters

sender
Type: System.Object

The source of the event.

e
Type: System.Xml.XmlNodeChangedEventArgs

An XmlNodeChangedEventArgs containing the event data.

When you create an XmlNodeChangedEventHandler 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 following example shows how to handle the NodeChanged and NodeInserted events.

using System;
using System.IO;
using System.Xml;

namespace Microsoft.Samples.Xml
{
    public class Sample
    {
        private const String filename = "book.xml";

        public static void Main()
        {
            Sample mySample = new Sample();
            mySample.Run(filename);
        }

        public void Run(String args)
        {

            // Create and load the XML document.
            Console.WriteLine("Loading file {0} ...", args);
            XmlDocument doc = new XmlDocument();
            doc.Load(args);

            //Create the event handlers.
            doc.NodeChanged += new XmlNodeChangedEventHandler(this.MyNodeChangedEvent);
            doc.NodeInserted += new XmlNodeChangedEventHandler(this.MyNodeInsertedEvent);

            // Change the book price.
            doc.DocumentElement.LastChild.InnerText = "5.95";

            // Add a new element.
            XmlElement newElem = doc.CreateElement("style");
            newElem.InnerText = "hardcover";
            doc.DocumentElement.AppendChild(newElem);

            Console.WriteLine("\r\nDisplay the modified XML...");
            Console.WriteLine(doc.OuterXml);

        }

        // Handle the NodeChanged event. 
        private void MyNodeChangedEvent(Object source, XmlNodeChangedEventArgs args)
        {
            Console.Write("Node Changed Event: <{0}> changed", args.Node.Name);
            if (args.Node.Value != null)
            {
                Console.WriteLine(" with value  {0}", args.Node.Value);
            }
            else
                Console.WriteLine("");
        }

        // Handle the NodeInserted event. 
        private void MyNodeInsertedEvent(Object source, XmlNodeChangedEventArgs args)
        {
            Console.Write("Node Inserted Event: <{0}> inserted", args.Node.Name);
            if (args.Node.Value != null)
            {
                Console.WriteLine(" with value {0}", args.Node.Value);
            }
            else
                Console.WriteLine("");
        }

    } // End class 
#using <mscorlib.dll>
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;

public __gc class Sample
{
public:
  void Run(String* args)
  {

     // Create and load the XML document.
     Console::WriteLine (S"Loading file {0} ...", args);
     XmlDocument* doc = new XmlDocument();
     doc->Load (args);

     //Create the event handlers.
     doc->NodeChanged += new XmlNodeChangedEventHandler(this, &Sample::MyNodeChangedEvent);
     doc->NodeInserted += new XmlNodeChangedEventHandler(this, &Sample::MyNodeInsertedEvent);

     // Change the book price.
     doc->DocumentElement->LastChild->InnerText = S"5.95";

     // Add a new element.
     XmlElement* newElem = doc->CreateElement(S"style");
     newElem->InnerText = S"hardcover";
     doc->DocumentElement->AppendChild(newElem);

     Console::WriteLine(S"\r\nDisplay the modified XML...");
     Console::WriteLine(doc->OuterXml);           

  }

  // Handle the NodeChanged event.
  void MyNodeChangedEvent(Object* /*src*/, XmlNodeChangedEventArgs* args)
  {
     Console::Write(S"Node Changed Event: <{0}> changed", args->Node->Name);
     if (args->Node->Value != 0)
     {
        Console::WriteLine(S" with value  {0}", args->Node->Value);
     }
     else
       Console::WriteLine(S"");
  }

  // Handle the NodeInserted event.
  void MyNodeInsertedEvent(Object* /*src*/, XmlNodeChangedEventArgs* args)
  {
     Console::Write(S"Node Inserted Event: <{0}> inserted", args->Node->Name);
     if (args->Node->Value != 0)
     {
        Console::WriteLine(S" with value {0}", args->Node->Value);
     }
     else
        Console::WriteLine(S"");
  }

}; // End class 

int main()
{
   Sample* mySample = new Sample();
   mySample->Run(S"book.xml");
}

The example uses the file book.xml as input.

<!--sample XML fragment-->
<book genre='novel' ISBN='1-861003-78' misc='sale-item'>
  <title>The Handmaid's Tale</title>
  <price>14.95</price>
</book>

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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