public class XVPage : Page { static private DirectoryInfo _Dir; private DirectoryInfo Dir { get { if (_Dir == null) { _Dir = new DirectoryInfo(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "App_Data")); if (!_Dir.Exists) _Dir.Create(); _Dir = new DirectoryInfo(Path.Combine(_Dir.FullName, "ViewState")); if (!_Dir.Exists) _Dir.Create(); } return _Dir; } } protected override object LoadPageStateFromPersistenceMedium() { PageStatePersister ps = this.PageStatePersister; ps.Load(); if (ps.ControlState != null) ps.ControlState = AntiSerialization((string)ps.ControlState); if (ps.ViewState != null) ps.ViewState = AntiSerialization((string)ps.ViewState); return new Pair(ps.ControlState, ps.ViewState); } protected override void SavePageStateToPersistenceMedium(object state) { PageStatePersister ps = this.PageStatePersister; if (state is Pair) { Pair pair = (Pair)state; ps.ControlState = pair.First; ps.ViewState = pair.Second; } else { ps.ViewState = state; } if (ps.ControlState != null) ps.ControlState = AntiSerialization(ps.ControlState); if (ps.ViewState != null) ps.ViewState = AntiSerialization(ps.ViewState); ps.Save(); } private object AntiSerialization(string stateID) { string stateStr = (string)Cache[stateID]; string file = Path.Combine(Dir.FullName, stateID); if (stateStr == null) stateStr = File.ReadAllText(file); else Cache.Remove(stateID); return new ObjectStateFormatter().Deserialize(stateStr); } private string AntiSerialization(object obj) { string value = new ObjectStateFormatter().Serialize(obj); string stateID = (DateTime.Now.Ticks + (long)value.GetHashCode()).ToString(); //产生离散的id号码 File.WriteAllText(Path.Combine(Dir.FullName, stateID), value); Cache.Insert(stateID, value); return stateID; } protected override void OnUnload(EventArgs e) { base.OnUnload(e); DateTime dt = DateTime.Now.AddMinutes(-20); foreach (FileInfo fl in Dir.GetFiles()) if (fl.LastAccessTime < dt) try { fl.Delete(); } catch { } } }