How to fix System AggregateException occurred in mscorlib dll

Question

I m receiving an unhandled exception while debugging  and the program stops executing  The debugger doesn t show me the line so I don t know what to fix      An unhandled exception of type  System AggregateException  occurred in mscorlib dll      Additional information  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       Cannot obtain value of local or argument   lt this gt   as it is not available at this instruction pointer  possibly because it has been optimized away   System Threading Tasks TaskExceptionHolder   How can I troubleshoot this problem   I also found this question which is pretty similar

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In my case I ran on this problem while using Edge js     all the problem was a JavaScript syntax error inside a C  Edge js function definition

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As the message says  you have a task which threw an unhandled exception   Turn on Break on All Exceptions  Debug  Exceptions  and rerun the program  This will show you the original exception when it was thrown in the first place      comment appended   In VS2015  or above   Select Debug   Options   Debugging   General and unselect the  Enable Just My Code  option

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The accepted answer will work if you can easily reproduce the issue   However  as a matter of best practice  you should be catching any exceptions  and logging  that are executed within a task   Otherwise  your application will crash if anything unexpected occurs within the task   Task Factory StartNew x  gt     throw new Exception  I didn t account for this        However  if we do this  at least the application does not crash   Task Factory StartNew x  gt     try         throw new Exception  I didn t account for this            catch Exception ex            Log ex

User · Answer

You could handle the exception directly so it would not crash your program  catching the AggregateException    You could also look at the Inner Exception  this will give you a more detailed explanation of what went wrong   try          your code    catch  AggregateException e

[c#] How to fix "'System.AggregateException' occurred in mscorlib.dll"

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