DNN Remove ViewState

最新推荐文章于 2025-09-11 21:09:27 发布

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最新推荐文章于 2025-09-11 21:09:27 发布

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文章标签： ui c#

原文链接：http://www.cnblogs.com/nevernet/archive/2011/07/04/2097262.html

本文详细介绍了 ASP.NET 中 ViewState 的存储与加载机制，包括如何使用 Session 对象和 Cache 来保存和恢复页面状态，以及使用自定义序列化器进行数据持久化。

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：

http://blogs.msdn.com/b/alikl/archive/2008/01/08/how-to-keep-asp-net-viewstate-on-the-server-revised.aspx

http://blogs.msdn.com/b/alikl/archive/2008/01/02/basic-sample-how-to-keep-asp-net-viewstate-on-the-server.aspx

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

国内的： http://www.cnblogs.com/xuhengzhang/archive/2004/12/30/84159.html

http://www.cnblogs.com/xiaozhang/archive/2007/11/19/964291.html

转载于:https://www.cnblogs.com/nevernet/archive/2011/07/04/2097262.html