MVC判断用户有没有登陆跳转登录页面AuthorizeAttribute

新建类MemberValidationAttribute.cs并集成此类AuthorizeAttribute

添加如下代码

  public class MemberValidationAttribute: AuthorizeAttribute
    {
        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            //获取Cookies中的user因为登陆时存的键值是user
            var memberValidation = System.Web.HttpContext.Current.Request.Cookies.Get("user");
            //如果memberValidation为null  或者 memberValidation不等于Success
            if (memberValidation == null || memberValidation.Value == "")
            {
                //页面跳转到 登录页面
                filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary(new { controller = "Sign", action = "Index" }));
                return;
            }
            //通过验证
            return;
        }
    }

　　如果判断是否登陆就在控制器的前面加 [MemberValidation]