如何查找未观察到的任务异常的来源

Question

在我们的 WPF 应用程序中，我们为未观察到的任务异常注册了一个事件处理程序：

TaskScheduler.UnobservedTaskException += OnUnobservedTaskException;

用以下方法：

private static void OnUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs exceptionEventArgs)
{
    _logger.Error(exceptionEventArgs.Exception, Properties.Resources.TaskExceptionsWereNotObserved);
    exceptionEventArgs.SetObserved();
}

我确实得到了完整的堆栈跟踪：

System.AggregateException: 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. (The I/O operation has been aborted because of either a thread exit or an application request.)
     ---> System.Net.Sockets.SocketException (995): The I/O operation has been aborted because of either a thread exit or an application request.
       at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource<System.Net.Sockets.SocketReceiveFromResult>.GetResult(Int16 token)
       at System.Threading.Tasks.ValueTask`1.ValueTaskSourceAsTask.<>c.<.cctor>b__4_0(Object state)
       --- End of inner exception stack trace ---

但是我们的代码中似乎没有任何内容。

我的问题：

有没有办法添加更多调试信息来知道这是在哪里触发的？因为我什至不确定异常发生在我们的代码中还是外部库中。

Answer 1

我建议利用 Handle

的

AggregateException

方法

对此 AggregateException 包含的每个异常调用处理程序。

private static void OnUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs exceptionEventArgs)
{
    exceptionEventArgs.SetObserved();
    ((AggregateException)exceptionEventArgs.Exception).Handle(ex =>
    {
        _logger.Error(ex); //Or whatever you like to do with the exception
        return true;
    });
}

---

为了简单起见，我使用了强制转换，但在生产代码中，在进行任何类型转换之前，请确保

exceptionEventArgs.Exception

是

AggregateException

。