原文摘自：去掉.net頁面中的input type=hidden name=__VIEWSTATE id=__VIEWSTATE
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
// 添加引用
using System.IO;
using System.Threading;
namespace CCL
{
/// <summary>
/// BasePage 的摘要說明
/// </summary>
public class BasePage : System.Web.UI.Page
{
#region 解決ViewState 過於龐大的問題
// 由於這裏添加了目錄, 所以要建立App_Data/ViewState 目錄.
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(); // 產生離散的id 號碼
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);
}
#endregion
}
}
不使用Session
，因爲它會“
丟失”
。ViewState
保存在磁盤上，即使服務器重新啓動，也不會丟失頁面狀態。
下面這段可以放在Global.asax
中，也可以根本不管：
C# code
protected void Application_Start(object sender, EventArgs e)
{
DirectoryInfo dir = new DirectoryInfo (this .Server.MapPath("~/App_Data/ViewState/" ));
if (!dir.Exists)
dir.Create();
else
{
DateTime nt = DateTime .Now.AddHours(-1);
foreach (FileInfo file in dir.GetFiles())
{
if (file.CreationTime < nt)
file.Delete();
}
}
}