asp.net mvc自定义特性之负责系统的统一登录验证

添加自定义的特性需要先继承ActionFilterAttribute

首先是实现源码：

C#

public class CheckLoginAttribute : ActionFilterAttribute
    {
        /// <summary>
        /// 负责系统的统一登录验证
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            //判断触发此方法的本身和控制器只要有一个贴了[SkipCheckLogin]标签，则跳过登录检查
            //判断action如果贴SkipCheckLoginAttribute标签，则阻断下面代码的运行
            if (filterContext.ActionDescriptor.IsDefined(typeof(SkipCheckLoginAttribute), false))
            {
                return;
            }
            //Session为空返回的登录
            if (filterContext.HttpContext.Session[Keys.Uinfo] == null)
            {
                ToLogin(filterContext, "您未登录");
                return;
            }
            //用户为空返回登录
            sys_user userInfo = filterContext.HttpContext.Session[Keys.Uinfo] as sys_user;
            if(userInfo == null || userInfo.bn_id <= 0)
            {
                ToLogin(filterContext, "您未登录");
                return;
            }
            //
            DBContext db = DapperDbContext.GetDbContext();
            var userinfo = db.Find<sys_user>(c => c.bn_id == userInfo.bn_id);
            if (userinfo != null)
            {
                filterContext.HttpContext.Session[Keys.Uinfo] = userinfo;
                filterContext.HttpContext.Session.Timeout = 1440;
            }
        }
        /// <summary>
        /// 没有登录就跳转到登录
        /// </summary>
        /// <param name="filterContext"></param>
        private static void ToLogin(ActionExecutingContext filterContext,string msg)
        {
            //获取当前action方法是否贴有AjaxRequest特性标签
            bool isajax = filterContext.ActionDescriptor.IsDefined(typeof(AjaxRequestAttribute), false);
            //表示截获的action方法是作为ajax来请求的
            if (isajax)
            {
                //如果ajax请求则应该返回json
                JsonResult json = new JsonResult();
                json.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
                json.Data = new { status = StateTypeEnum.nologin, msg = msg, loginurl = "/Login/Login" };
                filterContext.Result = json;
            }
            else
            {
                //如果是浏览器请求则直接将url跳转到登录页面即可
                ContentResult content = new ContentResult();
                content.Content = "<script>alert('"+ msg + "');top.location.href='/Login/Login'</script>";
                filterContext.Result = content;
            }
        }
    }

然后是它的使用方法：

C#

    [CheckLogin]
    public class WaterManagementController : Controller
    {
        ......    
    }