public class AuthorizeLogin : AuthorizeAttribute
    {
        protected override bool AuthorizeCore(HttpContextBase httpContext)
        {
            string url = httpContext.Request.RawUrl;
            if (url.Equals("/") || url.Contains("/Home/LoginOn/") || url.Contains("/Home/CheckCode"))
            {
                return true;
            }
            if (Admin.Commom.AdminInfo.Session == null)
            {
                httpContext.Response.StatusCode = 404;
                return false;
            }
            else
            {
                return true;
            }
        }

        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            base.OnAuthorization(filterContext);
            if (filterContext.HttpContext.Response.StatusCode == 404)
            {
                filterContext.Result = new RedirectResult("/");
            }
        }