Asp.net 中mvc 实现超时弹窗后跳转功能

为了实现保持登录状态,可以用cookie来解决这一问题
假设过期时间为30分钟,校验发生在服务器,借助过滤器,可以这样写

 public class PowerFilter : AuthorizeAttribute{public override void OnAuthorization（AuthorizationContext filterContext）{var cookie = HttpContext.Current.Request.Cookies["loginInfo"];if（null == cookie）{filterContext.Result = new RedirectResult（"/admin/login/index"）;}else{cookie.Expires = DateTime.Now.AddMinutes（30）;HttpContext.Current.Response.Cookies.Remove（"loginInfo"）;HttpContext.Current.Response.Cookies.Add（cookie）;}}}

但是页面直接跳转了,也没有一个提示,显得不是很友好,可以这样

public class PowerFilter : AuthorizeAttribute{public override void OnAuthorization（AuthorizationContext filterContext）{var cookie = HttpContext.Current.Request.Cookies["loginInfo"];if（null == cookie）{filterContext.Result = new ContentResult（）{Content = string.Format（"<script>alert（"登录超时,请重新登录"）;location.href="{0}"</script>","/admin/login/index"）};}else{cookie.Expires = DateTime.Now.AddMinutes（30）;HttpContext.Current.Response.Cookies.Remove（"loginInfo"）;HttpContext.Current.Response.Cookies.Add（cookie）;}}}}

但是,假如是ajax请求呢?

public class PowerFilter : AuthorizeAttribute{public override void OnAuthorization（AuthorizationContext filterContext）{var cookie = HttpContext.Current.Request.Cookies["loginInfo"];if（null == cookie）{if（！filterContext.HttpContext.Request.IsAjaxRequest（））{filterContext.Result = new ContentResult（）{Content = string .Format（"<script>alert（"登录超时,请重新登录"）;location.href="{0}"</script>","/admin/login/index"）};}else{filterContext.Result = new JsonResult（）{Data = new { logoff = true,logurl = "/admin/login/index" },ContentType = null,ContentEncoding = null,JsonRequestBehavior = JsonRequestBehavior.AllowGet};}}else{cookie.Expires = DateTime.Now.AddMinutes（30）;HttpContext.Current.Response.Cookies.Remove（"loginInfo"）;HttpContext.Current.Response.Cookies.Add（cookie）;}}}

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