Handling Errors with ASP.NET MVC
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by Steven Smith
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Adding HandleError Attribute

The way to tell your MVC controller to use the Error view for errors is to add the HandleError attribute to it.  HandleError is an ActionFilter that can be used to specify how the controller (or action) should respond to any unhandled exceptions that may occur.  You should also configure error handling in your configuration file by adding a <customErrors /> section to your <system.web /> section.  While testing, you can set the mode to "On" or "Off", and in production you'll likely want the mode to be "RemoteOnly".  Note that these are case-sensitive.

If you have customErrors mode set to Off, then HandleError won't actually do anything, and you'll continue to see the YSOD when errors occur in your application.  However, when you set customErrors mode to On, you'll start to see the correct behavior, which is a 500 error result and the custom error page (by default /Views/Shared/Error.cshtml but it will also search for other Views named Error in non-shared folder).

Listing 2 shows how to apply the HandleError attribute to two controller action methods.  When customerErrors is set to On, the first one will display the default Error.cshtml view and the second will display the MyErrorView.cshtml view.

Listing 2

        public ActionResult CreateErrorTwo()
            throw new Exception("Using HandleError Attribute.");
        [HandleError (View="MyErrorView")]
        public ActionResult CreateErrorThree()
            throw new Exception("Using HandleError Attribute and MyErrorView.");

You can also specify different ways to handle errors based on the type of the exception by setting the ExceptionType parameter on HandleError.  The attribute also supports an Order parameter, which will control the order in which the attributes are fired (highest number first, apparently, despite what the docs say).  Listing 3 shows how you can stack multiple HandleError attributes on a single action (and note that you can also apply the attribute at the Controller/class level).

Listing 3

        [HandleError(View = "MyErrorView", 
ExceptionType = typeof(NotImplementedException), Order=2)]
        [HandleError(View = "Error", Order=1)]
        public ActionResult CreateErrorFour(int id)
            if(id < 0)
                throw new NotImplementedException("id < 0");
            throw new Exception("id >= 0");

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User Comments

Title: exception   
Name: how to remove an exception
Date: 2011-03-28 6:59:43 AM
am getting an exception Function or proceedure xyz has too many arguments..

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