关于cache添加的一段代码~ 看不懂 求助
HttpContext.Current.Cache.Add(DummyCacheItemKey, String.Empty, null, DateTime.MaxValue, TimeSpan.FromMinutes(1), System.Web.Caching.CacheItemPriority.Normal, new System.Web.Caching.CacheItemRemovedCallback((x, y, z) => new System.Net.WebClient().DownloadData("HTTP://127.0.0.1/index.aspx" )));