继承自ActionFilterAttibute
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
//HttpContext.Current.Response.Write("OnActionExecuting:正要准备执行Action的时候但还未执行时执行<br />");
if (HttpContext.Current.Session["admin"] == null)
{
HttpContext.Current.Response.Write("<script>alert('请登录!');window.parent.location.href='/Admin/Login'</script>");
HttpContext.Current.Response.End();
return;
}
}