如何修复 mscorlib.dll 中发生“'System.AggregateException'”

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 ' <this> ' 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.

Answer 1

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.

Answer 2

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) {

}

Answer 3

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=>
   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=>
   try {
      throw new Exception("I didn't account for this");
   }
   catch(Exception ex) {
      //Log ex
   }
)

Answer 4

就我而言，我在使用 Edge.js 时遇到了这个问题——所有问题都是 C# Edge.js 函数定义中的 JavaScript 语法错误。

Answer 5

System.AggregateException HResult=0x80131500 Mensaje = Se han producido uno o varios errores. Origen = mscorlib Seguimiento de la pila: en System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) en System.Threading.Tasks.Task 1.GetResultCore(Boolean waitCompletionNotification) en System.Threading.Tasks.Task 1.get_Result() en Itrebol.Presentation.FormularioTerceros.<>c__DisplayClass26_0.b__1(Task 1 readTask) en C:\\Users\\GonzaloAlfonso\\source\\repos\\ServicioItrebol - copia\\Itrebol.Presentation\\FormularioTerceros.xaml.cs: línea 535 en System.Threading.Tasks.ContinuationTaskFromResultTask 1.InnerInvoke() en System.Threading.Tasks.Task.Execute() Excepción interna 1: JsonSerializationException: Cannot deserialize the current JSON object (eg {"name":"value"}) into type 'System.Collections.Generic.List`1[Itrebol.Dato.Modelo.TERCEROS]' because the type requires a JSON array (eg [1,2,3]) to deserialize correctly. To fix this error either change the JSON to a JSON array (eg [1,2,3]) or change the deserialized type so that it is a normal .NET type (eg not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object. Path 'Message', line 1, position 21.