Question

I have a Windows Phone 7 application (Silverlight-based) that sends a web request and receives a web response. It works fine – I am using BeginGetReponse and an AsyncCallback to call EndGetResponse.

However, I need to wait for the response to be fully received, so that I can fill a collection with the data from the response.

What would be the best way to wait for the operation to complete?

Answer 1

You should fill in your data in your callback, after you call EndGetResponse:

request.BeginGetResponse(
      asyncResult =>
      {
         var response = request.EndGetResponse(asyncResult);
         // fill in your data here
      },
      null);

If your need to fill in your data on the UI thread, you can return to UI thread like this:

var sc = System.Threading.SynchronizationContext.Current;
request.BeginGetResponse(
      asyncResult =>
      {
         var response = request.EndGetResponse(asyncResult);
         sc.Post(o => 
            {
               // fill in your data here
            }, null);
      },
      null);

http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.endgetresponse.aspx has more elaborate sample.