XmlRequest Class

Provides implementation for xml request. This class cannot be inherited.

Definition

public sealed class XmlRequest: Object, IDisposable

Members Table

The following table lists the members exposed by the XmlRequest object. Click a tab on the left to choose the type of member you want to view.

Methods

Method	Description
Abort	Cancels a request to a xml file.
AddHeader	Adds an header to the request.
Dispose
Equals	Overloaded. Compares two objects to determine if they are equal. (Inherited from Object)
GetHashCode	Serves as a hash function for a particular type, suitable for use in hashing algorithms and data structures like a hash table. (Inherited from Object)
GetType	Gets the Type of the current instance. (Inherited from Object)
ReferenceEquals	Determines whether the specified Object instances are the same instance. (Inherited from Object)
Start	Overloaded. Starts the request.
ToString	Returns a String that represents the current Object. (Inherited from Object)
XmlRequest	Initializes a new instance of XmlRequest.

Properties

Property	Description
ContentLength	Gets the total size of the file to load.
LoadedPercentage	Gets the loaded percentage of the xml file.
LoadedSize	Gets the size of the requested content already loaded.
Response	Gets the response of the request.
Speed	Gets the speed of file loading.
State	Gets the state of the request.
Timeout	Gets or sets the timeout for the response.
XmlError	Gets an integer number which represents an Xml error.

Events

Event	Description
StateChanged	Handles the changes of the state of the request.

Inheritance Hierarchy

Object

XmlRequest

Examples

Copy Code to Clipboard

// This sample shows how to implement the XmlRequest class.

 

using System;

using System.Drawing;

using System.Windows.Forms;

using System.Net;

using System.Xml;

 

public class MyForm : System.Windows.Forms.Form

{

     private System.Windows.Forms.Button button1;

     private System.Windows.Forms.TextBox textBox1;

     public MyForm()

     {

          InitializeComponent();

     }

 

     private void InitializeComponent()

     {

          this.SuspendLayout();

          this.button1 = new System.Windows.Forms.Button();

          this.button1.Location = new System.Drawing.Point(10, 10);

          this.button1.Text = "Download";

          this.Size = new System.Drawing.Size(400,300);

          this.Text = "MyForm";

          this.button1.Click += new EventHandler(on_click);

          this.textBox1 = new System.Windows.Forms.TextBox();

          this.textBox1.Location = new System.Drawing.Point(10, 45);

          this.textBox1.Multiline= true;

          this.textBox1.WordWrap= false;

          this.textBox1.ScrollBars= ScrollBars.Both;

          this.textBox1.Size= new Size(380,245);

          this.textBox1.Text = "";

          this.Controls.Add(button1);

          this.Controls.Add(textBox1);

          this.ResumeLayout(false);

     }

 

     private void on_click( object sender, EventArgs e )

     {

          this.textBox1.Text = "downloading...\n";

          XmlRequest req= new XmlRequest();

          req.StateChanged += new EventHandler(on_state_changed);

          bool ok= req.Start("http://www.markme.com/notifications/flash.xml");

          if( !ok )

               this.textBox1.Text = "*** Start failed!\n";

     }

     private void on_state_changed( object sender, EventArgs e )

     {

          string msg;

          XmlRequest req= (XmlRequest) sender;

          switch( req.State )

          {

               case XmlRequestState.Success: msg= "Success!\n"; break;

               case XmlRequestState.Cancelled: msg= "Cancelled\n"; break;

               case XmlRequestState.Error: msg= "Error\n"; break;

               case XmlRequestState.Running: msg= "Running\n"; break;

               case XmlRequestState.Timeout: msg= "Timeout\n"; break;

               default: msg="<unknown>\n;"; break;

          }

          this.textBox1.Text = msg;

          if( req.State == XmlRequestState.Success )

          {

               XmlDocument doc= req.Response;

               XmlNode rdf= doc.FirstChild;

               foreach( XmlNode node in rdf.ChildNodes )

               {

                    if( node.Name == "channel" )

                    {

                         foreach( XmlAttribute attr in node.Attributes )

                         this.textBox1.AppendText( "channel=" + attr.Name + " " + attr.Value + "\n" );

                    }

                    else if( node.Name == "item" )

                    {

                         foreach( XmlAttribute attr in node.Attributes )

                         this.textBox1.AppendText( "channel=" + attr.Name + " " + attr.Value + "\n" );

                    }

               }

          }

     }

     static void Main()

     {

          Application.Run( new MyForm() );

     }

}

 

Class Information

Namespace	System.Net
Flash Library	System.XML.scl
Flash Library Version	2.0.0.1690
Silverlight Library	System.XML.dll