Load xml file from website into XDocument (silverlight and WP7)

Question

Hi,

I have an xml file that I want to access in an WP7 and Silverlight app. Th exml file is on a webserver and I want to access is through http://www.mydomain.com/data/this_is_my_file.xml. So I want to use this url to load the xml file into an XDocument;

Any ideas,

thanks,

Filip

Answer 1

You can use WebClient or HttpWebRequest to download (asynchronously) and parse the response. One of the simplest approach to download and parse XML from the web is below -

public void LoadXmlItems(string xmlUrl)
{
   WebClient client = new WebClient();

   client.OpenReadCompleted += (sender, e) =>
   {
        if (e.Error != null)
            return;

        Stream str = e.Result;
        XDocument xdoc = XDocument.Load(str);

        // take 10 first results
        List<RssFeedItem> rssFeedItems = (from item in xdoc.Descendants("item")
                                            select new XmlItem()
                                            {
                                                Title = item.Element("title").Value,
                                                Description = item.Element("description").Value,
                                                Url = new Uri(item.Element("link").Value, UriKind.Absolute)
                                            }).ToList();
        // close
        str.Close();

        // add results to the list
        XmlItems.Clear();
        foreach (RssFeedItem item in rssFeedItems)
        {
           XmlItems.Add(item);
        }
    };
    client.OpenReadAsync(new Uri(xmlUrl, UriKind.Absolute));
}

xmlUrl is the path to the XML file on the web. XmlItem is a class like so -

public class XmlItem
{
  public string Title { get; set; }
  public string Description { get; set; }
  public Uri Url { get; set; }
}

You need to note that you may encounter cross-thread exception if you are updating an observable collection. In the above example, XmlItems is a List<XmlItem>. However, if you wish to add the XMLItem's to an observable collection, use this piece of code instead -

Dispatcher.BeginInvoke(() =>
{
  XmlItems.Clear();
  foreach (RssFeedItem item in rssFeedItems)
  {
     XmlItems.Add(item);
  }
});

An alternative approach is to use HttpWebRequest. You can read about this approach here and use the code in the sample.

HTH, indyfromoz