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POC# and Caliburn - RescueAttribute and Coroutines
 

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    <p>I think I have found a situation where RescueAttribute is broken. Or maybe I am using co-routines incorrectly.</p> <p>I have a ViewModel like this:</p> <pre><code>[Rescue("Rescue")] class MyViewModel { //... left out some bus-logic code here ... public void Login() { yield return Show.Busy(); //the following line will also cause the problem, just like AsyncResult //yield return Show.MessageBox("Test"); yield return new AsyncResult(() =&gt; _server.Login()); //throw new Exception("Aww, snap!"); yield return Show.NotBusy(); } public void Rescue(Exception exc) { //Show a messagebox or something } } </code></pre> <p>AsyncResult is implemented like so:</p> <pre><code>using Exec = Caliburn.PresentationFramework.Invocation.Execute; public class AsyncResult : IResult { private readonly Action _function; public AsyncResult(Action function) { _function = function; } public void Execute(ResultExecutionContext context) { Exec.OnBackgroundThread(delegate { try { _function(); } catch (Exception exc) { Exec.OnUIThread(() =&gt; Completed(this, new ResultCompletionEventArgs { Error = exc, WasCancelled = true })); return; } Exec.OnUIThread(() =&gt; Completed(this, new ResultCompletionEventArgs())); }); } public event EventHandler&lt;ResultCompletionEventArgs&gt; Completed = delegate { }; } </code></pre> <p>If I uncomment the exception in my above ViewModel, Rescue fails to handle the exception.</p> <p>Is this a bug in Caliburn, or is AsyncResult implemented wrong?</p> <p>If you put an exception before the yield to return an AsyncResult, Rescue works just fine. Also if the exception is thrown <em>on</em> the async thread, rescue still works!</p> <p>EDIT: you can also use Show.MessageBox instead of AsyncResult to reproduce the same problem.</p>
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