How to allow custom ExceptionFilter to continue to call the designated Action Method during exceptions

Question

When my Exception Filter is called, I'd like the intended action within my controller to still be called. I had created the following IExceptionFilter:

    public class ArgumentExceptionFilter : FilterAttribute, IExceptionFilter
    {
        public void OnException(ExceptionContext filterContext)
        {
            if (filterContext.Exception.GetType() == typeof(System.ArgumentException))
            {
                //Some logic to create a default "SettingsRoot" parameter

                //This simply surpresses MVC from raising exception
                filterContext.ExceptionHandled = true;
            }
        }
    }

and this filter is applied to this controller action method:

   [ArgumentExceptionFilter]
   public ActionResult MyActionMethod(SettingsRoot settings)
   {
     ActionResult actionResult = null;

     //Do stuff with settings

     return actionResult;
   }

I would like to have "MyActionMethod()" to be called regardless if we get an exception that triggers the ExceptionFilter. I also tried to use "RedirectToRouteResult()" approach but that didn't work. Any suggestions?

Answer 1

You can use the Result property of the filterContext to redirect to your controller action with a default parameter.

    public void OnException(ExceptionContext filterContext)
    {
        if (filterContext.Exception.GetType() == typeof(System.ArgumentException))
        {
            //This simply surpresses MVC from raising exception
            filterContext.ExceptionHandled = true;

            //Some logic to create a default "SettingsRoot" parameter
            filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary
            {
                { "controller", "Default" },
                { "action", "MyActionMethod" },
                { "settings", new SettingsRoot() }
            });
        }
    }