asp.Netは元のファイルの長すぎるviewstateコードを処理します

 
  
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(); //     id   
  
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 
  
{ 
  
} 
  
} 
  
}