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ASP.NET MVC OnException and Ajax Form onFailure

The situation I have is, I am handling the OnException in my controller. Depending on the type of the exception, I would like to return a javascript result. The action method that threw the exception was called by submitting an ajax form. The ajax form handles the success event. In my OnException method, I set ExceptionHandled = true for all examples I have seen. The problem is even that an exception was thrown and I returned a JavascriptResult that called the success method and the returned javascript was not executed. Any suggestions as to why this is happening and how I can get the JavascriptResult to execute.

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Here's the sequence of events:

  • browser sent ajax request
  • the action method on the server took over and threw an exception.
  • Your OnException method got a chance to view the exception and decided to set ExceptionHandled = true.
  • your OnException method returned JavascriptResult
  • since the ExceptionHandled parameter is set to true, MVC stops the exception handling chain at this point and returns a JavascriptResult to the browser with an HTTP 200 OK result code
  • The ajax code in the browser receives the result and interprets it as an indication that everything is fine; it then calls OnComplete and then OnSuccess.


Your options:

  • Set status code 500 in response before returning from OnException. The browser will call OnComplete, then OnFailure.

  • Process the return value in OnComplete, not OnSuccess, and then return false to indicate that OnSuccess should not be called.

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