asp.net mvc自定义特性之进行统一的权限检查

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声明一个自定义特性，继承自ActionFilterAttribute：

    /// 
/// 负责进行统一的权限检查
    /// 
public class CheckPermissAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            //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();
            //获取控制器名称
            string controllName = filterContext.ActionDescriptor.ControllerDescriptor.ControllerName;
            //获取控制器方法名称
            string actionName = filterContext.ActionDescriptor.ActionName;

            string sql = "select DISTINCT m.mController,m.mAction,m.mName from sys_menus m INNER JOIN sys_permisslist p on m.mID=p.mID ";
            sql += " INNER JOIN sys_userroler ur on p.rID = ur.RoleID and ur.uid =@uid ";
            Dictionarystring, object> param = new Dictionarystring, object>();
            param.Add("@uid", userInfo.bn_id);
            var list = db.FindListBySql>(sql, param).ToList();

            bool isPermiss = false;
            //判断该用户是否包含该页面的访问权限
            foreach (var item in list)
            {
                if (item.mController.Contains(controllName) && item.mAction.Contains(actionName))
                {
                    isPermiss = true;
                    break;
                }
            }

            if (!isPermiss)
            {
                ToLogin(filterContext, "您没有权限访问该页面");
                return;
            }

        }

        /// 
/// 没有登录就跳转到登录
        /// 
/// 
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 = "