ASP.NET(6):Session的值丢了，Session没丢，因为SessionID是一致的，好像找到原因了。

开发环境:XP sp2 VS2008 IE 6.0

问题:开发过程中发现Session的值丢了，Session没丢，因为SessionID是一致的,很是郁闷，

知道对Bin或web.config文件进行修改会重新编译网站，就是没发现对其它目录操作会引发如此怪异的问题。记录一下

最后发现对WEB站点的目录(包括子目录)进行目录操作（重命名、删除）的时候会引发Session的值丢失,直接创建文件夹或操作文件则不会。

简单测试代码:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SessionTEST.aspx.cs" Inherits="SessionTEST" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <p>
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="刷新" /></p>
        <p>
            <asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="站点下创建一个文件夹" /></p>
        <p>
            <asp:Button ID="Button3" runat="server" OnClick="Button3_Click" Text="站点下删除一个文件夹" /></p>
        <p>
            <asp:Button ID="Button4" runat="server" Text="重新加载" onclick="Button4_Click" />

        </p>
    </div>
    </form>
</body>
</html>

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;

public partial class SessionTEST : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            SetSessionInfo();
        }
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        WriteSessionInfo();
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        string newDir = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, DateTime.Now.ToFileTimeUtc().ToString());
        Directory.CreateDirectory(newDir);
        WriteSessionInfo();
    }
    protected void Button3_Click(object sender, EventArgs e)
    {

        foreach (var v in Directory.GetDirectories(AppDomain.CurrentDomain.BaseDirectory))
        {
            DirectoryInfo dirInfo = new DirectoryInfo(v);
            var delDirName = dirInfo.Name;
            long vv;
            if (delDirName.Length == 18 && long.TryParse(delDirName, out vv))
            {
                dirInfo.Delete();
                break;
            }
        }
        WriteSessionInfo();
    }

    void WriteSessionInfo()
    {
        if (Session["TEST"] != null)
            Response.Write(String.Format("【SessionID;{0}】Session[\"TEST\"]={1}", Session.SessionID, Session["TEST"].ToString()));
        else
            Response.Write(String.Format("【SessionID;{0}】Session[\"TEST\"]={1}", Session.SessionID, "null"));
    }

    void SetSessionInfo()
    {
        if (Session["TEST"] == null)
        {
            Session["TEST"] = "TEST";
        }
        WriteSessionInfo();
    }

    protected void Button4_Click(object sender, EventArgs e)
    {
        SetSessionInfo();
    }
}

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