这次行动是在TaskScheduler.UnobservedTaskException中的WebAPI取消

问题描述

最近，我在我的后端API的应用程序添加错误日志记录每UnobservedTaskException。
其原因是，一些API调用执行这些完成后，我返回的结果额外的任务，这就是为什么我不能行动有跟踪错误（网络API调用）的水平。

Recently I have added error logging for every UnobservedTaskException at my backend API app.The reason is that some API call executes additional tasks which are finished AFTER I return the result, that is why I couldn't track errors there on action (web api calls) level.

现在我得到很多的操作被取消异常和不知道该怎么办。我甚至不知道这异常是由API调用执行我的任务造成的。

Now I'm getting lots of "The operation was canceled" exceptions and not sure what to do with it. I even not sure that this exception is caused by my tasks executed by API call.

下面是堆栈：

System.OperationCanceledException: The operation was canceled.
   at System.Threading.CancellationToken.ThrowIfCancellationRequested()
   at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.WebHost.HttpControllerHandler.<CopyResponseAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.WebHost.HttpControllerHandler.<ProcessRequestAsyncCore>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.TaskAsyncHelper.EndTask(IAsyncResult ar)
   at System.Web.HttpApplication.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar)

任何想法如何调试呢？

Any ideas how to debug it?

推荐答案

任务取消例外，从任务通常来自一个被中止的请求。我们正在追踪将其固定在5.2而这些都不会在异常记录器显示的错误。所以，通常你可以放心地忽略这些。

Task cancel exception comes typically from tasks from an aborted request. We are tracking a bug that will be fixed in 5.2 where these are not going to show up in the exception logger. So typically you can safely ignore these.

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这篇关于这次行动是在TaskScheduler.UnobservedTaskException中的WebAPI取消的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！