gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcForDebug2.Infrastructure {
    public class ServiceAttribute : ActionFilterAttribute  {
        public override void OnActionExecuted(ActionExecutedContext filterContext) {
            if (filterContext.RequestContext.HttpContext.Request.IsAjaxRequest()) {

                 var viewResult = filterContext.Result as ViewResult;

                filterContext.Result = new JsonResult {
                    Data = viewResult.Model
                };
            }
        }
    }
}