Session超时问题(AOP 过滤器)

public class TimeoutAttribute : ActionFilterAttribute

    {

        public override void OnActionExecuting(ActionExecutingContext filterContext)

        {

            HttpContextBase context = filterContext.HttpContext;

            HttpResponseBase response = filterContext.HttpContext.Response;

            HttpRequestBase request = filterContext.HttpContext.Request;

            if (context.Session["User"] == null)

            {

                if (request.IsAjaxRequest())

                    response.Status = "401 Session Timeout";

                else

                    response.Redirect("/Home/Login");//返回登录页

                filterContext.Result = new HttpUnauthorizedResult();//这一行保证不再执行Action的代码

                response.End();//必须加上这句，否则返回前台status始终是200

                return;

            }

            base.OnActionExecuting(filterContext);

        }

    }
前台：
error:function(a,b,c){

if(c.statusText=="Session Timeout"){
                location="/home/login";
            }

}