HttpWebRequest Timeout in WP7

Question

I am trying to implement a HttpWebRequest timeout for my WP7 app, as the user could make a request, and the request will never come back, leaving a ProgressBar I have on the screen.

I saw this MSDN page: msdn page

Which uses

ThreadPool.RegisterWaitForSingleObject (result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), myHttpWebRequest, DefaultTimeout, true);

I was able to add this code, and link up all the variables, but when I add it to my code, It gives a NotSupportedOperation when getting to the line:

allDone.WaitOne();

If i comment it out, it gives the same NotSupportedOperation at my next line,

return _result_object; (function is private object SendBeginRequest())

How can I add a timeout in WP7? This way does not seem to work. I would prefer not to use WebClient due to the UI thread issue.

Derek Lakin · Accepted Answer · 2011-01-20 09:06:08Z

In case you missed it, allDone is supposed to be a ManualResetEvent, and you can pass either an integer number of milliseconds or a TimeSpan as the amount of time to wait before continuing. For example:

private ManualResetEvent _waitHandle = new ManualResetEvent(false); private bool _timedOut; ... this._timedOut = false; this._waitHandle.Reset(); HttpWebRequest request = HttpWebRequest.CreateHttp("http://cloudstore.blogspot.com"); request.BeginGetResponse(this.GetResponse_Complete, request); bool signalled = this._waitHandle.WaitOne(5); if (false == signalled) { // Handle the timed out scenario. this._timedOut = true; } private void GetResponse_Complete(IAsyncResult result) { // Process the response if we didn't time out. if (false == this._timedOut) { HttpWebRequest request = (HttpWebRequest)result.AsyncState; WebResponse response = request.EndGetResponse(result); // Handle response. } }

Alternatively, you could use a third party library such as Hammock, which enable syou to do timeouts and retry attempts (among other things). Depending on your project, that might be more than you need, though :)

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