Attribute特性

Attribute是一个类，用来对程序中的元素进行标注，如类型、字段、方法和属性等。Attributes和Microsoft .NET Framework文件的元数据保存在一起，可以用来向运行时描述你的代码，或者在程序运行的时候影响应用程序的行为。根据不同的标签做出不同的处理。

 [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false)]
    public class UserAuthorizeAttribute : AuthorizeAttribute
    {
        #region 字段和属性
        /// <summary>
        /// 模块别名，可配置更改
        /// </summary>
        public string ModuleAlias { get; set; }
        /// <summary>
        /// 权限动作
        /// </summary>
        public string OperaAction { get; set; }
        /// <summary>
        /// 权限访问控制器参数
        /// </summary>
        private string Sign { get; set; }
        /// <summary>
        /// 基类实例化
        /// </summary>
        public BaseController baseController = new BaseController();

        #endregion

        #region 权限认证
        /// <summary>
        /// 权限认证
        /// </summary>
        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            try
            {
                HttpContext.Current.Request.UrlReferrer.ToString();
            }
            catch
            {
                filterContext.Result = new EmptyResult();
                return;
            }
            //1、判断模块是否对应
            if (string.IsNullOrEmpty(ModuleAlias))
            {
                filterContext.HttpContext.Response.Write(" <script type='text/javascript'> alert('^您没有访问该页面的权限！'); </script>");
                filterContext.RequestContext.HttpContext.Response.End();
                filterContext.Result = new EmptyResult();
                return;
            }
            //2、判断用户是否存在
            if (baseController.CurrentUser == null)
            {
                filterContext.HttpContext.Response.Write(" <script type='text/javascript'> alert('^登录已过期，请重新登录！');window.top.location='/'; </script>");
                filterContext.RequestContext.HttpContext.Response.End();
                filterContext.Result = new EmptyResult();
                return;
            }
            //对比变量，用于权限认证
            var alias = ModuleAlias;
            #region 配置Sign调取控制器标识
            Sign = filterContext.RequestContext.HttpContext.Request.QueryString["sign"];
            if (!string.IsNullOrEmpty(Sign))
            {
                if (("," + ModuleAlias.ToLower()).Contains("," + Sign.ToLower()))
                {
                    alias = Sign;
                    filterContext.Controller.ViewData["Sign"] = Sign;
                }
            }
            #endregion
            //3、调用下面的方法，验证是否有访问此页面的权限，查看加操作
            var moduleId = baseController.CurrentUser.Modules.Where(p => p.ALIAS.ToLower() == alias.ToLower()).Select(p => p.ID).FirstOrDefault();
            bool _blAllowed = this.IsAllowed(baseController.CurrentUser, moduleId, OperaAction);
            if (!_blAllowed)
            {
                filterContext.HttpContext.Response.Write(" <script type='text/javascript'> alert('您没有访问当前页面的权限！');</script>");
                filterContext.RequestContext.HttpContext.Response.End();
                filterContext.Result = new EmptyResult();
                return;
            }
            //4、有权限访问页面，将此页面的权限集合传给页面
            filterContext.Controller.ViewData["PermissionList"] = GetPermissByJson(baseController.CurrentUser, moduleId);
        }
        /// <summary>
        /// 获取操作权限Json字符串，供视图JS判断使用
        /// </summary>
        string GetPermissByJson(Account account, int moduleId)
        {
            //操作权限
            var _varPerListThisModule = account.Permissions.Where(p => p.MODULEID == moduleId).Select(R => new { R.PERVALUE }).ToList();
            return Common.JsonConverter.Serialize(_varPerListThisModule);
        }
        /// <summary>
        /// 功能描述：判断用户是否有此模块的操作权限
        /// </summary>
        bool IsAllowed(Account user, int moduleId, string action)
        {
            //判断入口
            if (user == null || user.Id <= 0 || moduleId == 0 || string.IsNullOrEmpty(action)) return false;
            //验证权限
            var permission = user.Permissions.Where(p => p.MODULEID == moduleId);
            action = action.Trim(',');
            if (action.IndexOf(',') > 0)
            {
                permission = permission.Where(p => action.ToLower().Contains(p.PERVALUE.ToLower()));
            }
            else
            {
                permission = permission.Where(p => p.PERVALUE.ToLower() == action.ToLower());
            }
            return permission.Any();
        }
        #endregion
    }

 /// <summary>
        /// 加载主页
        /// </summary>
        /// <returns></returns>
        [UserAuthorizeAttribute(ModuleAlias = "Role", OperaAction = "View")]
        public ActionResult Index()
        {}

 

来源：https://www.cnblogs.com/llsg/p/11365130.html