Making a HTTP request and listening its completion in Windows Phone

This article include how to make http request using WebClient and listening requst completion using EventHandler.

Article Metadata

---

Article

Created: (10 Apr 2012)

Last edited: croozeus (02 May 2012)

Introduction

HTTPManeger.cs

    public class HTTPManager
    {
        private WebClient webdownloader;
        private Uri uri;
        public event EventHandler WebRequestCompleted;
        public  HTTPManager(string url)
        {
            webdownloader = new WebClient();
            uri = new Uri(url);
        }
        public void MakeRequest()
        {
            webdownloader.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DataDownloaded);
            webdownloader.DownloadStringAsync(uri);
        }
        public void DataDownloaded(object sender, DownloadStringCompletedEventArgs args)
        {
            EventHandler handler = WebRequestCompleted;
            if (handler != null)
            {
                handler(sender , args);
            }
        }
 
    }

//now write another class which actully uses above class to make http request and wants to listen request completion

    public partial class MainPage : PhoneApplicationPage
    {
        private string loginurl;
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            MakeRequest();
        }
        private void MakeRequest() //you can call this method from any event eg.button click,  for simplicity i called it from ctor.
        {
               string  loginurl = "http://www.developer.nokia.com/Community/Wiki/Most_Viewed_Windows_Phone_Articles";
               try
                {
                    if (!System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
                    {
                        MessageBox.Show("N/W connection not available");
                    }
                    else
                    {
                        HTTPManager httpmanager = new HTTPManager(loginurl);
                        httpmanager.WebRequestCompleted += this.DownlLodCompleted;
                        httpmanager.MakeRequest();
                    }
                 }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
      }
      public void DownlLodCompleted(object sender, EventArgs args)
      {
             MessageBox.Show("Your request is  completed.....");
      }
   }