ASP.NET 2.0的视图状态持久性机制

namespace StreamPageAdapter
{
　using System;
　using System.IO;
　using System.Security.Permissions;
　using System.Web;
　using System.Web.UI;

　//
　// The StreamPageStatePersister is an example view state
　// persistence mechanism that persists view and control
　// state on the Web server.
　//

　[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]

　public class StreamPageStatePersister : PageStatePersister
　{
　　public StreamPageStatePersister(Page page): base(page)
　　{}
　　//
　　// Load ViewState and ControlState.
　　//

　　public override void Load()
　　{
　　　Stream stateStream = GetSecureStream();
　　　// Read the state string, using the StateFormatter.
　　　StreamReader reader = new StreamReader(stateStream);
　　　IStateFormatter formatter = this.StateFormatter;
　　　string fileContents = reader.ReadToEnd();
　　　// Deserilize returns the Pair object that is serialized in
　　　// the Save method.
　　　Pair statePair = (Pair)formatter.Deserialize(fileContents);
　　　ViewState = statePair.First;
　　　ControlState = statePair.Second;
　　　reader.Close();
　　　stateStream.Close();
　　}
　　//
　　// Persist any ViewState and ControlState.
　　//

　　public override void Save()
　　{
　　　if (ViewState != null || ControlState != null)
　　　{
　　　　if (Page.Session != null)
　　　　{
　　　　　Stream stateStream = GetSecureStream();
　　　　　StreamWriter writer = new StreamWriter(stateStream);
　　　　　IStateFormatter formatter = this.StateFormatter;
　　　　　Pair statePair = new Pair(ViewState, ControlState);

　　　　　// Serialize the statePair object to a string.
　　　　　string serializedState = formatter.Serialize(statePair);
　　　　　writer.Write(serializedState);
　　　　　writer.Close();
　　　　　stateStream.Close();
　　　　}
　　　　else
　　　　　throw new InvalidOperationException("Session needed for StreamPageStatePersister.");
　　　}
　　}

　　// Return a secure Stream for your environment.

　　private Stream GetSecureStream()
　　{
　　　string path = @"d:\a.txt";
　　　FileStream fs = new FileStream(path, FileMode.Open, FileAccess.ReadWrite);
　　　return fs;
　　}
　}
}

　　再重写PageStatePersister属性就可以了：

protected override PageStatePersister PageStatePersister
{
　get
　{
　　return new StreamPageStatePersister (Page);

　}

using System.Security.Permissions;
using System.Web;
using System.Web.UI;

namespace PageAdapter
{
　[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
　public class MyPageAdapter : System.Web.UI.Adapters.PageAdapter
　{
　　public override PageStatePersister GetStatePersister()
　　{
　　　return new PageAdapter.DatabasePageStatePersister(Page);
　　}
　}
}

＜browsers＞
＜browser refID="Default" ＞
＜controlAdapters＞
＜adapter
　controlType="System.Web.UI.Page"
　adapterType="PageAdapter.MyPageAdapter" /＞
　＜/controlAdapters＞
＜/browser＞
＜/browsers＞