How to work with webClient.OpenReadCompleted event handler?

How to work with webClient.OpenReadCompleted event handler?

I'm using the following code and it works nice

private void somethingButton_Click(object sender, System.Windows.RoutedEventArgs e) { WebClient webClient = new WebClient(); webClient.OpenReadCompleted += webClient_OpenReadCompleted; webClient.OpenReadAsync(new Uri(myUri)); }  void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) { if(e.Error != null) { messageTextBlock.Text = e.Error.Message; return; } using (Stream s=e.Result)             {                 XDocument document = XDocument.Load(s);                  var q1 = from c in document.Descendants("result")                         select new IndeedResult                                 {                                     Title =((string)c.Element("title")).Trim(),                                     ResultUri = ((string)c.Element("url")).Trim(),                                     Date = ((string)c.Element("date")).Trim(),                                 }; myDataGrid.ItemsSource = q1; } 

But I want to add another WebClient, webClient2 that will do exactly the same but has different uri and different structure so I will have webClient2_OpenReadCompleted...

The problem is that finally I need to merge (or do some logic before merge) var q1 from webClient_OpenReadCompleted and var q2 from webClient2_OpenReadCompleted and then

var mergedQs = q1.Union(q2).ToList(); myDataGrid.ItemsSource = mergedQs 

Is there a simple way how to do it? I don't know how to do it using those event handlers.

Answers & Comments...

Answer: 1

Good question! Did it like this

    void webClient_OpenReadCompleted( object sender, OpenReadCompletedEventArgs e )     {         Stream stream = (Stream)e.Result;         BinaryReader reader = new BinaryReader( stream );          byte[] buffer = reader.ReadBytes( (int)stream.Length );         Uri uri = (Uri)e.UserState;          streams.Add( uri.AbsoluteUri, new MemoryStream( buffer ) );     } 

Note the usage of UserState in order to provide a unqiue key into my streams Dictionary. Works perfectly :-) This way you can work with as many files / images / binary data as you like!

See this to see just how powerful this can be....http://www.alansimes.com/warp3dsilverlighttestpage.html

by : Alan Simeshttp://stackoverflow.com/users/447501

---