What does this mean and how to resolve it?
I am using TPL tasks.
The whole error
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.
at System.Threading.Tasks.TaskExceptionHolder.Finalize()
mscorlib
Best Answer
If you create a Task, and you don't ever call
task.Wait()
or try to retrieve the result of aTask<T>
, when the task is collected by the garbage collector, it will tear down your application during finalization. For details, see MSDN's page on Exception Handling in the TPL.The best option here is to "handle" the exception. This can be done via a continuation - you can attach a continuation to the task, and log/swallow/etc the exception that occurs. This provides a clean way to log task exceptions, and can be written as a simple extension method, ie:
With the above, you can prevent any task from tearing down the app, and logging it, via:
Alternatively, you can subscribe to the TaskScheduler.UnobservedTaskException and handle it there.