Question

Recently I decided to work with Rx (Reactive Extensions) for Windows Phone 7 and I encountered some weird behavior.

For example, I have this piece of code:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://whatismyip.org/");
request.Method = "GET";

var x = from c in Observable.FromAsyncPattern<WebResponse>(request.BeginGetResponse, request.EndGetResponse)()
            select c;

WebResponse r = x.First();
Debug.WriteLine(r.ContentType.ToString());

What I am trying to figure out is why when I reach the LINQ query, it hangs the UI and doesn’t go any further than this. Any ideas?

Answer 1

AFAIK, call to First is blocking, so execution will be resumed only after receiving response.
Try replace it with

x.Take(1).Subscribe(r => Debug.WriteLine(r.ContentType.ToString()));