Invoking operations asynchronously with expiration

I have a classic asynchronous message dispatching problem. Essentially, I need to asynchronously dispatch messages and then capture the message response when the dispatch is complete. The problem is, I can't seem to figure out how to make any one request cycle self-expire and shortcircuit.

Here is a sample of the pattern I am using at the moment:

Defined delegate for invokation

private delegate IResponse MessageDispatchDelegate(IRequest request);

Dispatch messages with a callback

var dispatcher = new MessageDispatchDelegate(DispatchMessage);
dispatcher.BeginInvoke(requestMessage, DispatchMessageCallback, null);

Dispatch the message

private IResponse DispatchMessage(IRequest request)
  //Dispatch the message and throw exception if it times out

Get results of dispatch as either a response or an exception

private void DispatchMessageCallback(IAsyncResult ar)
  //Get result from EndInvoke(r) which could be IResponse or a Timeout Exception

What I can't figure out is how to cleanly implement the timeout/shortcircuit process in the DispatchMessage method. Any ideas would be appreciated


        var dispatcher = new MessageDispatchDelegate(DispatchMessage);

        var asyncResult = dispatcher.BeginInvoke(requestMessage, DispatchMessageCallback, null);
        if (!asyncResult.AsyncWaitHandle.WaitOne(1000, false))
             /*Timeout action*/
            response = dispatcher.EndInvoke(asyncResult);

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