缓存 Cache

Controllers层

  public class HomeController : Controller
    {
        //
        // GET: /Home/
       // [OutputCache(Duration = 10, Location = OutputCacheLocation.ServerAndClient)]
        public ActionResult Index()
        {
            // HttpRuntime.Cache.Remove("Ecache");//清空缓存
            if (HttpRuntime.Cache["Ecache"] == null)
            {
                ViewData.Model = DataClass.getDataList();
                ViewData["aa"] = "没有缓存从库写入!";
            }
            else
            {
                ViewData.Model = HttpRuntime.Cache["Ecache"];
                ViewData["aa"] = "读缓存数据!";
            }
            //NoSlidingExpiration可以设置相对的过期时间，如果缓存在NoSlidingExpiration设定的时间内没有被访问，
            //缓存过期一定时间内没有被访问，缓存过期，如果在一定时间内都有访问，缓存将不会过期。如在30分钟有访问Cache就不过期：
            HttpRuntime.Cache.Insert("Ecache", ViewData.Model, null, DateTime.Now.AddMinutes(30), Cache.NoSlidingExpiration);
            //absoluteExpiration所插入对象将过期并被从缓存中移除的时间。
            return View();
        }
        public ActionResult Default()
        {
            if (BLLClass.JudgeCache())
            {
                ViewData.Model = DataClass.getDataList();//从数据库读
                ViewData["aa"] = "AA没有缓存从库写入!";
            }
            else
            {
                ViewData.Model = BLLClass.ReadCache();//从缓存里读
                ViewData["aa"] = "AA读缓存数据!";
            }
            BLLClass.CacheInsert(ViewData.Model,30);
            return View();
        }
    }
}

数据层

public class DataClass
    {
        public static List<User_Info> getDataList()
        {
            List<User_Info> list = new List<User_Info>();
            User_Info user;
            for (int i = 1; i < 20; i++)
            {
                user = new User_Info();
                user.ID = i;
                user.Name = "User" + i.ToString();
                list.Add(user);
            }
                return list;
        }
    }

BLL层,把这个写到BLL层里了。就是作一个参考

 public class BLLClass
    {
        /// <summary>
        ///  Cache:创建缓存
        /// </summary>
        /// <param name="data"></param>
        /// <param name="time">过期时间</param>
        public static void CacheInsert(object data,int time)
        {
            HttpContext.Current.Cache.Insert("Acache", data, null, DateTime.Now.AddMinutes(time), Cache.NoSlidingExpiration);
        }
        /// <summary>
        /// 判断缓存
        /// </summary>
        /// <returns></returns>
        public static bool JudgeCache()
        {
            if (HttpRuntime.Cache["Acache"] == null)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        /// <summary>
        /// 读取缓存
        /// </summary>
        /// <returns></returns>
        public static object ReadCache()
        {
            return HttpRuntime.Cache["Acache"];
        }
    }