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protected override object LoadPageStateFromPersistenceMedium()
{
var viewStateID = (string)((Pair)base.LoadPageStateFromPersistenceMedium()).Second;
var stateStr = (string)Cache[viewStateID];
if (stateStr == null)
{
var 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)
{
var value = new ObjectStateFormatter().Serialize(state);
var viewStateID = (DateTime.Now.Ticks + (long)this.GetHashCode()).ToString(); //产生离散的id号码
var fn = Path.Combine(this.Request.PhysicalApplicationPath, @"App_Data/ViewState/" + viewStateID);
ThreadPool.QueueUserWorkItem(obj => File.WriteAllText(fn, value));
Cache.Insert(viewStateID, value);
base.SavePageStateToPersistenceMedium(viewStateID);
}
protected void Application_Start(object sender, EventArgs e)
{
var dir = new DirectoryInfo(this.Server.MapPath("~/App_Data/ViewState/"));
if (!dir.Exists)
dir.Create();
else
{
var nt = DateTime.Now.AddHours(-1);
dir.GetFiles().ForEach(f =>
{
if (f.CreationTime < nt)
f.Delete();
});
}
}