/*
* //将视图状态保存到文件中
* //此方法应在Global.asax\Application_Start中调用
* private void CreateViewStateDirectory()
* {
#region 建立文件夹保存视图状态的文件 并删除过期文件
* System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(this.Server.MapPath("~/App_Data/ViewState/"));
* if (!dir.Exists) dir.Create();
* else
* {
* DateTime nt = DateTime.Now.AddHours(-1);
* foreach (System.IO.FileInfo f in dir.GetFiles())
* {
* if (f.CreationTime < nt) f.Delete();
* }
* }
#endregion
* }
* 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);
* }
*/
//压缩ViewState并保存到session中
protected override void SavePageStateToPersistenceMedium(object pageViewState)
{
MemoryStream ms = new MemoryStream();
System.Web.UI.LosFormatter m_formatter = new System.Web.UI.LosFormatter();
m_formatter.Serialize(ms, pageViewState);
ms.Position = 0;
StreamReader sr = new StreamReader(ms);
string viewStateString = sr.ReadToEnd();
byte[] ViewStateBytes = Convert.FromBase64String(viewStateString);
ViewStateBytes = ViewStateCompression.Compress(ViewStateBytes);
Session["__ViewState"] = Convert.ToBase64String(ViewStateBytes);
ms.Close();
return;
}
// 序列化ViewState
protected override object LoadPageStateFromPersistenceMedium()
{
object viewStateBag;
string m_viewState = (string)Session["__ViewState"];
byte[] ViewStateBytes = Convert.FromBase64String(m_viewState);
ViewStateBytes = ViewStateCompression.Decompress(ViewStateBytes);
System.Web.UI.LosFormatter m_formatter = new System.Web.UI.LosFormatter();
try
{
viewStateBag = m_formatter.Deserialize(Convert.ToBase64String(ViewStateBytes));
}
catch (Exception ex)
{
//Log.Insert( "页面Viewtate是空." );
viewStateBag = string.Empty;
}
return(viewStateBag);
}
