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POHow to make Elmah work with UnobservedTaskException
 

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  1. POHow to make Elmah work with UnobservedTaskException
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    <p>I'm developing a asp.net mvc application. The architecture of my application as below:</p> <ol> <li>a DBAccessLayer //layer for accessing database </li> <li>a ServiceLayer //layer to connect 1 and 3. </li> <li>a WebLayer //Web UI layer</li> </ol> <p>I want to log all application exceptions including the exceptions in the TaskScheduler.UnobservedTaskException event.</p> <p>I've tested to do as below:</p> <pre><code>protected void Application_Start() { ... TaskScheduler.UnobservedTaskException += (object sender, UnobservedTaskExceptionEventArgs excArgs) =&gt; { ErrorSignal.FromCurrentContext().Raise(excArgs.Exception); excArgs.SetObserved(); }; } </code></pre> <p>but when the UnobservedTaskException event is fired, the application crashed with exception as below:</p> <pre><code> System.ArgumentNullException was unhandled Message=Value cannot be null. Parameter name: context Source=Elmah ParamName=context StackTrace: at Elmah.ErrorSignal.FromContext(HttpContext context) in c:\builds\ELMAH\src\Elmah\ErrorSignal.cs:line 67 at MyMvcApplication.&lt;Application_Start&gt;b__0(Object sender, UnobservedTaskExceptionEventArgs excArgs) in ...\Global.asax.cs:line 82 at System.Threading.Tasks.TaskScheduler.PublishUnobservedTaskException(Object sender, UnobservedTaskExceptionEventArgs ueea) at System.Threading.Tasks.TaskExceptionHolder.Finalize() </code></pre> <p>Additionally, I put the UnobservedTaskException event in the global.asax.cs of WebLayer, can it be fired when the DBAccessLayer and ServiceLayer have unobserved exceptions?</p> <p>Thanks.</p>
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    1. CODoesn't directly answer your question, but we have code in our apps that attempts to get the current HttpContext. If it succeeds, it logs via Elmah, otherwise it generates an email...
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