如何允许自定义ExceptionFilter在异常期间继续调用指定的Action方法

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() }
            });
        }
    }