Problems finding which process throws ‘Unexpected exception’

BjornArne Dybvik

6y918C#

Hi!

Happy new year!

My name is Bjorn Arne Dybvik.

I am currently working on an assignment that consists of finding out what is causing the following error:

'Unexpected exception occured in a worker thread'

I have worked a lot on it and have managed to "catch" the error in the method'

private void UnobservedTaskExceptionHandler(object sender, UnobservedTaskExceptionEventArgs args)

{

var aggException = args.Exception.Flatten();

foreach (var exception in aggException.InnerExceptions)

{

LogErrorMessage($"Aggregate exception occured in a worker thread {sender.ToString()} ", exception);

}

Exception e = args.Exception;

LogErrorMessage("Unexpected exception occured in a worker thread", e);

}

But I have no clue how to find out where the error is coming from (stacktrace is empty).

Does anyone know how to find out what is causing the error?

Best regards

Bjorn Arne Dybvik

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

BjornArne Dybvik6y ago
Hi!

Thanks for the replies.
Sorry for late answer. I have been a little bit busy for the last days.

I am trying to reproduce the error, but it is intermittent.
Have added the code

to all projects in the solution where the error is catched (app.config file). The new code is released to our development server(environment) and I am watching the log of this environment waiting for the error to occur.

I am not sure if I have completely understood the use of 'legacyUnhadledExceptionPolicy' so it is possible that I must add some more code to be able to locate the error.

Regarding the innerexception it is only null at the moment wit this stacktrace:

at System.Web.ThreadContext.AssociateWithCurrentThread(Boolean setImpersonationContext)
at System.Web.HttpApplication.OnThreadEnterPrivate(Boolean setImpersonationContext)
at System.Web.HttpApplication.System.Web.Util.ISyncContext.Enter()
at System.Web.Util.SynchronizationHelper.SafeWrapCallback(Action action)
at System.Threading.Tasks.Task.Execute()

I will try to get more info in the innerexception.

Can also add that the exception text is as follow:

A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread.

Best regards
Bjorn Arne Dybvik
Jignesh Kumar6y ago
Hello,

Please try to add this line in your web config or app settings file,
Salman Beg6y ago
Hi.
Debug the code line by line.
Try to get the InnerException.
Thanks.