MVC切片编程

在商城网站中，用户中心的每个页面都要几乎都要涉及对用户是否登录的判断，为了减少代码重写，可采用切片编程

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcWeb.Public
{
    public class IsLoginCheckAttribute : ActionFilterAttribute  
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            string returnUrl = filterContext.RequestContext.HttpContext.Request.Path;
            HttpCookie cookie = filterContext.RequestContext.HttpContext.Request.Cookies[SystemConfig.UserId];
            int uid = cookie== null ? 0 : Convert.ToInt32(cookie.Value);
            if (uid == 0)
            {
                filterContext.Result = new RedirectToRouteResult("Default", new System.Web.Routing.RouteValueDictionary(
                    new { controller = "user", action = "login", returnurl = returnUrl })
                );
            }
            else
            {
                base.OnActionExecuting(filterContext);
            }
        }
    }

    public class IsShopLoginCheckAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            string returnUrl = filterContext.RequestContext.HttpContext.Request.Path;
            HttpCookie shopCookie = filterContext.RequestContext.HttpContext.Request.Cookies[SystemConfig.ShopID];
            int shopid = shopCookie == null ? 0 : Convert.ToInt32(shopCookie.Value);
            if (shopid == 0)
            {
                HttpCookie cookie = filterContext.RequestContext.HttpContext.Request.Cookies[SystemConfig.UserId];
                int uid = cookie == null ? 0 : Convert.ToInt32(cookie.Value);
                if (uid == 0)
                {
                    filterContext.Result = new RedirectToRouteResult("Default", new System.Web.Routing.RouteValueDictionary(
                        new { controller = "shop", action = "login", returnurl = returnUrl })
                    );
                }
                else
                {
                    #region 店铺信息
                    Dictionary<string, object> param = new Dictionary<string, object>();
                    param.Add("uid", uid);
                    string shopurl = RouteManager.GetApiRoute("Shop", "SingleShopByUID", param);
                    DDGW.VIEWMODEL.Shops shop = Newtonsoft.Json.JsonConvert.DeserializeObject<DDGW.VIEWMODEL.Shops>(Business.Basic.Shop.ShopList.PostShop(shopurl));
                    #endregion
                    if (shop.ShopsID > 0)
                    {
                        shopCookie = new HttpCookie(SystemConfig.ShopID, shop.ShopsID.ToString());
                        filterContext.RequestContext.HttpContext.Response.SetCookie(shopCookie);
                        base.OnActionExecuting(filterContext);
                    }
                    else
                    {
                        filterContext.Result = new RedirectToRouteResult("Default", new System.Web.Routing.RouteValueDictionary(
                            new { controller = "shop", action = "login", returnurl = returnUrl })
                        );
                    }
                }
            }
            else {
                base.OnActionExecuting(filterContext);
            }
        }
    }
}

使用时：

        [HttpGet]
        [IsLoginCheck]
        public ActionResult Comment(int uid)
        {
            IList<SubOrders> noComments = new List<SubOrders>();
            #region 用户未评价子订单
            noComments = UserList.Instance.NoCommentOrders(uid);
            #endregion
            this.ViewBag.no = noComments;
            this.ViewBag.uid = uid;
            return View();
        }