解决ViewState过于庞大的问题

最新推荐文章于 2025-05-08 10:50:24 发布

原创最新推荐文章于 2025-05-08 10:50:24 发布 · 846 阅读

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#string #object #pair #cache #null

本文介绍了一种优化ViewState的方法，通过将ViewState存储在文件系统和缓存中来减轻ViewState过大导致的问题。该方法创建了一个名为App_Data/ViewState的目录用于存放ViewState数据。

#region 解决ViewState过于庞大的问题
        //由于这里添加了目录,所以要建立App_Data/ViewState目录.
        protected override object LoadPageStateFromPersistenceMedium()
        {
            string viewStateID = (string)((Pair)base.LoadPageStateFromPersistenceMedium()).Second;
            string stateStr = (string)Cache[viewStateID];
            if (stateStr == null)
            {
                string fn = Path.Combine(this.Request.PhysicalApplicationPath, @"App_Data/ViewState/" + viewStateID);
                stateStr = File.ReadAllText(fn);
            }
            return new ObjectStateFormatter().Deserialize(stateStr);
        }

        protected override void SavePageStateToPersistenceMedium(object state)
        {
            string value = new ObjectStateFormatter().Serialize(state);
            string viewStateID = (DateTime.Now.Ticks + (long)this.GetHashCode()).ToString(); //产生离散的id号码
            string fn = Path.Combine(this.Request.PhysicalApplicationPath, @"App_Data/ViewState/" + viewStateID);
            //ThreadPool.QueueUserWorkItem(File.WriteAllText(fn, value));
            File.WriteAllText(fn, value);
            Cache.Insert(viewStateID, value);
            base.SavePageStateToPersistenceMedium(viewStateID);
        }
        #endregion