文件下载后会话过期

当用户从我的ASP.NET应用程序下载文件时,会话将在下载文件几秒钟后过期。在可以执行任何任务的会话到期之前,但在大约5-10秒后,会话将重新启动并注销。

我创建了一个简单的页面来演示这一点。要运行此简单页,请创建一个新的ASP.NET C项目,然后将代码插入新页。

编辑: 这似乎是一个IE7问题。火狐和Chrome不受影响。

我认为负责会话重新启动的代码是:

HttpContext.Current.Response.ContentType = "text/xml";
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=test.xml");
HttpContext.Current.Response.Write("<test>this is a test.</test>");
HttpContext.Current.Response.End();

要重新创建此问题:

1. 将下面的代码复制到ASP.NET页中。
2. 使用IE(我使用了IE7,火狐和Chrome似乎没有这个问题)
3. 请注意,会话是新的。
4. 刷新页面;注意会话不是新的。
5. 下载并保存文件。
6. 点击“刷新页面”按钮几次,直到“会话是新的”文本重新显示(大约10秒)。

以下是简单娱乐活动的代码:

<%@ Page Language="C#" AutoEventWireup="true" %>
<!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>Untitled Page</title>
</head>
<body>
    <script runat="server">
        private string sessionString {
            get {
                return HttpContext.Current.Session["sessionString"] == null ? null : HttpContext.Current.Session["sessionString"].ToString();
            }
            set {
                HttpContext.Current.Session["sessionString"] = value;
            }
        }
        protected void Page_Load(object sender, EventArgs e) {
            Label1.Text = sessionString ?? "Session is null";
            if(sessionString == null) {
                Label1.Text = "Session is new";
                Label1.BackColor = System.Drawing.Color.Red;
                sessionString = "Session is now not null";
            }
            else {
                Label1.Text = sessionString;
                Label1.BackColor = System.Drawing.Color.White;
            }
        }
        protected void LinkButton1_Click(object sender, EventArgs e) { }
        protected void LinkButton2_Click(object sender, EventArgs e) {
            HttpContext.Current.Response.ContentType = "text/xml";
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=test.xml");
            HttpContext.Current.Response.Write("<test>this is a test.</test>");
            HttpContext.Current.Response.End();
        } 
    </script>
    <form id="form1" runat="server">
    <div>
        <asp:Label id="Label1" runat="server" text="Label"></asp:Label> <br />
        <asp:LinkButton id="LinkButton1" runat="server" onclick="LinkButton1_Click">Refresh Page</asp:LinkButton> <br />
        <asp:LinkButton id="LinkButton2" runat="server" onclick="LinkButton2_Click">Download File</asp:LinkButton> <br /><br />
        <b>Steps to recreate:</b>
        <ol>
            <li>Download the file and save it.</li>
            <li>Hit the "Refresh Page" button a couple of times until the "Session is new" text is redisplayed.</li>
            <li>Answer my question explaining what the heck is going on!</li>
        </ol>
    </div>
    </form>
</body>
</html>