ASP.NET MVC controller action with Interceptor pattern

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcCallInterceptors.Controllers;
using MvcCallInterceptors.Interceptors;
using MvcCallInterceptorsDemo.Models;

namespace MvcCallInterceptorsDemo.Controllers
{
    public class MyHomeAccountController : BaseMvcController
    {
        //
        // GET: /MyHome/

        [ActionInterceptor("Home", "Index")]
        public object Index(InterceptorParasDictionary<string,object> paras, object result)
        {
            (result as ViewResult).ViewBag.Message = (result as ViewResult).ViewBag.Message + " Hey, I have intercepted.";
            return result;
          
            /*//verify for error whether HandleError filter gets called.
            object s = null;
            (result as ViewResult).ViewBag.Message = s.ToString() + (result as ViewResult).ViewBag.Message + " Hey, I have intercepted.";
            
            ViewBag.Message = s.ToString();
            return result;*/
        }


        [ActionInterceptor(InterceptionOrder.Before, "Account", "LogOn")]
        public void SubmitLogOn(InterceptorParasDictionary<string, object> paras, object result)
        {
            if (paras.Count > 0)
            {
                (paras["model"] as LogOnModel).UserName = "***" + (paras["model"] as LogOnModel).UserName;
            
            }            
            
        }

        [ActionInterceptor(InterceptionOrder.After, "Account", "LogOn")]
        public object MyLogOn(InterceptorParasDictionary<string, object> paras, object result)
        {
            if (paras.Count == 0)
            {
                return View("MyLogOn");
            }
            else
            {
                return result;
            }
        }

        protected override string View
        {
            get { return "MyHome"; }
        }
    }
}