缓存处理

1。 Bll层；（MsgType为表名）

public class MsgType 
    {
         protected AggregateCacheDependency dependency = new AggregateCacheDependency();
        public MsgType() : base("MsgType")
        {
             dependency.Add(new SqlCacheDependency(ConfigurationManager.AppSettings   ["CacheDatabaseName"].ToString(), "MsgType"));
        }

         public AggregateCacheDependency GetDependency()
         {
             return dependency;
         }
  }

2。 调用Bll的页面层；

public IList<MsgTypeEntity> GetMsgType()
        {
                string key = "MsgType";
                IList<MsgTypeEntity> data = (IList<MsgTypeEntity>)HttpRuntime.Cache[key];

                if (data == null)
                {//缓存中不存在，则从数据库中取到缓存中。。。
                    MsgType bll = new MsgType();
                    data = bll.GetEntities<MsgTypeEntity>("");
                    AggregateCacheDependency cd = bll.GetDependency();
                    System.Web.HttpRuntime.Cache.Add(key, data, cd, DateTime.Now.AddHours(24),  Cache.NoSlidingExpiration, CacheItemPriority.High, null);
                }
                return data;

}