mvc ajax访问后台时session过期无法跳转到Login页面问题解决

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public class BaseController : Controller     {        protected User UserInfo         {             set             {                 Session["UserInfo"] = value;             }                get             {                 if (Session["UserInfo"] == null)                 {                     return null;                 }                 else                 {                     return (User)Session["UserInfo"];                 }             }         }            protected override void OnActionExecuting(ActionExecutingContext filterContext)         {             //验证码             if (filterContext.ActionDescriptor.ActionName.Equals("ValidateCode", StringComparison.CurrentCultureIgnoreCase))             {                 return;             }             #region Session判断             if (UserInfo==null && !filterContext.ActionDescriptor.ActionName.Contains("Login"))             {                 filterContext.Result = //new RedirectResult("/Home/Login");//这样也可以                 new RedirectToRouteResult(                         new System.Web.Routing.RouteValueDictionary { { "controller", "Home" }, { "action", "Login" } });                 //Response.Redirect("/Home/Login");//不建议这个，它会继续往下执行action                 return;             }             #endregion                base.OnActionExecuting(filterContext);         }  }

 

前台解决嵌套iframe问题（针对ActionResult返回页面有效，用ajax请求无效）

<script type="text/javascript">
        $(function () {
           //判断一下当前是不是做顶层，如果不是，则做一下顶层页面重定向
            if (window != top) {
                top.location.href = location.href;
            }
        });  
    </script>

针对ajax请求，使用以上方式，ajax请求是没有变化的，ajax返回的状态码302，而Login返回状态码200，理论是显示的，但是