using System.Collections.Generic;
using System.Web.Mvc;
using System.Web.Routing;namespace MvcApplication1.Controllers
{public class BaseController<TModel> : Controller{private const string loginSession = "LoginSession";private const string shoppingCartSession = "ShoppingCartSession";private const string errorController = "Error";private const string LoginController = "Login";private const string LoginAction = "Login";//没有登录的跳转到登录页protected override void Initialize(RequestContext requestContext){base.Initialize(requestContext);//如果没有登录，且不是出错和登录控制器就跳转到登录页if (!NoNeedSessionController(requestContext) && !HasLoginSession()){GoToAction(requestContext, Url.Action(LoginAction, LoginController));}}//对哪些不需要依赖缓存的控制器 返回trueprivate bool NoNeedSessionController(RequestContext requestContext){//从路由数据中取到当前controller的名称var c = requestContext.RouteData.Values["controller"].ToString().ToLower();//把不需要依赖Session的控制器名称放到列表中var noNeedSessionList = new List<string>{errorController.ToLower(),LoginController.ToLower()};return noNeedSessionList.Contains(c);}//跳转到某个视图private void GoToAction(RequestContext requestContext, string action){requestContext.HttpContext.Response.Clear();requestContext.HttpContext.Response.Redirect(action);requestContext.HttpContext.Response.End();}//登录的时候判断是否有Sessionprotected bool HasLoginSession(){return Session[loginSession] != null;}//判断购物车是否有Sessionprotected bool HasShoppingCartSession(){return Session[shoppingCartSession] != null;}//从Session中获取登录模型的实例protected TModel GetLoginModelFromSession(){return (TModel)this.Session[loginSession];}//从Session中获取购物车模型的实例protected TModel GetShoppingCartModelFromSession(){return (TModel)this.Session[shoppingCartSession];}//设置登录Sessionprotected void SetLoginSession(TModel loginModel){Session[loginSession] = loginModel;}//设置购物车Sessionprotected void SetShoppingCartSession(TModel shoppingCartModel){Session[shoppingCartSession] = shoppingCartModel;}//让登录Session失效protected void AbandonLoginSession(){if (HasLoginSession()){Session.Abandon();}}//让购物车Session失效protected void AbandonShoppingCartSession(){if (HasShoppingCartSession()){Session.Abandon();}}}
}

using System.Web.Mvc;
using MvcApplication1.Models;namespace MvcApplication1.Controllers
{public class LoginController : BaseController<LoginModel>{public ActionResult Index(){//把登录模型实例保存到Session中LoginModel loginModel = new LoginModel();SetLoginSession(loginModel);//从Session中获取登录模型实例LoginModel sessioModel = GetLoginModelFromSession();//使登录Session失效
            AbandonLoginSession();return View();}}
}