c# - 来自 Asp.Net Web Api 异步/任务调用的正确堆栈跟踪

Question

当我使用客户端调用 Web Api 时发生错误。问题是我返回的堆栈跟踪有点不可读，没有行号所以我不确定去哪里看。这是作为 Json 响应返回的。

 "message": "An error has occurred.",
"exceptionMessage": "Object reference not set to an instance of an object.",
"exceptionType": "System.NullReferenceException",
"stackTrace": "   at WakeSocial.Gateway.WebApi.Host.Controllers.NotificationsController.<Response>d__7.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Threading.Tasks.TaskHelpersExtensions.<CastToObject>d__3`1.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.AuthenticationFilterResult.<ExecuteAsync>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"
}

有没有一种方法可以配置 web api 以返回发生错误的行号，以便我可以更适本地调试问题？

这里讨论了这个问题:Stack traces with async/await

我目前使用的是 .Net 4.5，但错误仍然以这种方式输出。

Answer 1

我正在使用一个在异常中存储堆栈跟踪信息的扩展，例如，原始代码:

try{    
   await NestedAsyncOperation();
}catch(NullReferenceException e){
  Debug.WriteLine(e)
}

具有可读的堆栈跟踪:

try{    
   await NestedAsyncOperation().Trace();
}catch(Exception e){
   e.Catch((NullReferenceException ex) => {
     Debug.WriteLine(e);
   }).RethrowUnhandled();
}

并且输出将包含带有行号的堆栈跟踪。查看更多https://github.com/ilio/AsyncStackTrace/blob/master/UnitTests/AsyncStackTraceExtensionUnitTest.cs