[Mono-list] Null task exception when doing ContinueWith

Rodrigo Kumpera kumpera at gmail.com
Fri May 2 13:24:49 UTC 2014

Can you provide with a test case that shows this behavior? If so, please
file a bug report.

On Fri, May 2, 2014 at 7:17 AM, Giuliano Barberi <gbarberi at aotaonline.com>wrote:

> Hey guys I'm seeing something strange. It could totally be user error but
> I can't seem to figure it out.
> I am doing this on some tasks that I never await in order to get the
> exception:
>         public static Task CatchUnhandledException(this Task task)
>         {
>             return task.ContinueWith(continuation =>
> Engine.UnhandledExceptionHandler(continuation.Exception),
>                               TaskContinuationOptions.ExecuteSynchronously
> | TaskContinuationOptions.OnlyOnFaulted);
>         }
> and the Engine.UnhandledExceptionHandler just logs the exception.
> What's strange is that the exception is null and also doing
> an Environment.StackTrace in the handler also yields nothing. I do have
> --debug with the mdb files so I would suspect to get the full stacktrace. I
> never saw this issue when I was running on .NET runtime but I also have
> added more async code since so I'm not sure if it's something with Mono or
> my app. I just can't find anything online and the documentation for Tasks
> says that if it's faulted state there will be an exception.
> Regards
> --
> Giuliano Barberi
> _______________________________________________
> Mono-list maillist  -  Mono-list at lists.ximian.com
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