ASP.NET(6):Session的值丟了，Session沒丟，因為SessionID是一致的，好像找到原因了。

最後更新：2018-12-07 來源：互聯網

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開發環境:XP sp2 VS2008 IE 6.0

問題:開發過程中發現Session的值丟了，Session沒丟，因為SessionID是一致的,很是鬱悶，

知道對Bin或web.config檔案進行修改會重新編譯網站，就是沒發現對其它目錄操作會引發如此怪異的問題。記錄一下

最後發現對WEB網站的目錄(包括子目錄)進行目錄操作（重新命名、刪除）的時候會引發Session的值丟失,直接建立檔案夾或操作檔案則不會。

簡單測試代碼:

<%@ 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>無標題頁</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <p>
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="重新整理" /></p>
        <p>
            <asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="網站下建立一個檔案夾" /></p>
        <p>
            <asp:Button ID="Button3" runat="server" OnClick="Button3_Click" Text="網站下刪除一個檔案夾" /></p>
        <p>
            <asp:Button ID="Button4" runat="server" Text="重新載入" 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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