VB.net:
Protected Overrides Function LoadPageStateFromPersistenceMedium() As Object
Dim key As String = Request.RawUrl + "__viewstate"
If Session(key) IsNot Nothing Then
Dim stream As MemoryStream = DirectCast(Session(key), MemoryStream)
stream.Seek(0, SeekOrigin.Begin)
Return losFormatter.Deserialize(stream)
End If
Return Nothing
End Function
Protected Overrides Sub SavePageStateToPersistenceMedium(ByVal state As Object)
Dim key As String = Request.RawUrl + "__viewstate"
Dim stream As New MemoryStream()
losFormatter.Serialize(stream, state)
stream.Flush()
Session(key) = stream
End Sub
C#:
protected override object LoadPageStateFromPersistenceMedium()
{
string key = Request.RawUrl + "__viewstate";
if (Session[key] != null)
{
MemoryStream stream = (MemoryStream)Session[key];
stream.Seek(0, SeekOrigin.Begin);
return losFormatter.Deserialize(stream);
}
return null;
}
protected override void SavePageStateToPersistenceMedium(object state)
{
string key = Request.RawUrl + "__viewstate";
MemoryStream stream = new MemoryStream();
losFormatter.Serialize(stream, state);
stream.Flush();
Session[key] = stream;
}
里面涉及到一个参数的定义：
protected LosFormatter losFormatter = new LosFormatter();
另外Cache方式：
protected override void SavePageStateToPersistenceMedium(object viewState)
{
string str = "VIEWSTATE_" + Request.UserHostAddress + "_" + DateTime.Now.Ticks.ToString();
Cache.Add(str, viewState, null, DateTime.Now.AddMinutes(Session.Timeout),TimeSpan.Zero, CacheItemPriority.Default, null);
RegisterHiddenField("__VIEWSTATE_KEY", str);
RegisterHiddenField("__VIEWSTATE", "");
}
protected override object LoadPageStateFromPersistenceMedium()
{
string str = Request.Form["__VIEWSTATE_KEY"];
if (!str.StartsWith("VIEWSTATE_")) {
throw new Exception("Invalid viewstate key:" + str);
}
return Cache[str];
}
参见：http://www.eggheadcafe.com/articles/20040613.asp
参考：
SessionPageStatePersister - http://msdn.microsoft.com/en-us/library/system.web.ui.sessionpagestatepersister.sessionpagestatepersister(v=VS.90).aspx
2003年发布的：http://aspalliance.com/72