ASP.NET 使用浏览器下载文件并同时重定向到另一个页面 [英] ASP.NET download file using browser and redirect to another page at the same time

问题描述

前段时间我在授权例程中有以下代码:

 protected void Login1_LoggedIn(object sender, EventArgs e){string returnUrl = Request.QueryString["ReturnUrl"];if (!string.IsNullOrEmpty(returnUrl)){//从服务器下载文件Response.Redirect(returnUrl);}}

returnUrl 是服务器上文件的完整路径，所以我以前通过浏览器下载标准对话框下载文件.但是现在我需要在授权后立即将用户重定向到另一个页面，同时下载文件.所以现在我需要类似的东西

<代码>{//从服务器下载文件Response.Redirect(returnUrl);Response.Redirect("/");}

我找不到正确的方法.我尝试了很多方法，但没有任何帮助.重要的一点是我不能使用像 download.aspx 这样的中间页面，它只用于下载然后重定向到必要的页面.所以，我使用的方法:

1.

Response.Redirect(returnUrl, false);Response.Redirect("/");

结果:文件没有下载，立即重定向发生.

2.

Response.Redirect(returnUrl, false);Response.Redirect("/", false);

结果:什么都没有发生.

3.

Response.Clear();Response.ClearHeaders();Response.ClearContent();Response.ContentType = "应用程序/八位字节流";Response.AddHeader("Content-Disposition", "attachment; filename=" + returnUrl);Response.TransmitFile(Server.MapPath("~" + returnUrl));Response.End();Response.Redirect("/");

结果:文件已下载，但没有重定向.当 remove Response.End(); 重定向发生，但文件未加载.

1. 具有以下更改的先前变体:添加:Response.AddHeader("Refresh", "3; URL=/home.aspx");

已删除:Response.Redirect("/");

结果:文件正在下载，但没有发生刷新/重定向.

1. 使用 javascript 下载文件:

Response.Write("language='javascript'>window.location.assign('returnUrl','download','');");Response.Redirect("/");

结果:文件未加载，发生重定向.用 "<script>alert('test');</script>" 替换了 Response.Write 参数.没有警报出现，重定向发生.

你知道有什么问题吗?

解决方案

我在 asp.net 论坛上得到了帮助，对 这里.我已将以下代码放置在必须重定向授权用户的页面上:

<%--我们使用 iframe 和下面的脚本供非授权用户通过直接链接下载文件--%><script runat="服务器">protected void Page_Load(object sender, EventArgs e){iframeFile.Attributes["src"] = Request.QueryString["file"];}<asp:Content ContentPlaceHolderID="masterContent" runat="server"><div><iframe id="iframeFile" runat="server" style="display: none;"></iframe>

在登录页面的代码隐藏中，我编写了以下用于下载文件的片段:

string returnUrl = Request.QueryString["ReturnUrl"];if (!string.IsNullOrEmpty(returnUrl)){Response.Redirect("/?file=" + Server.UrlEncode(returnUrl));}

现在问题解决了.

Some time ago I had the following code in authorization routine:

 protected void Login1_LoggedIn(object sender, EventArgs e)
        {
            string returnUrl = Request.QueryString["ReturnUrl"];   
            if (!string.IsNullOrEmpty(returnUrl))
            {
                // download file from server

                Response.Redirect(returnUrl);
            }
        }

returnUrl is a full path to the file on the server, so I used to download the file via browser download standard dialog this way. But now I need to redirect user to another page right after authorization, at the same time when downloading file. So now I need something like

{
    // download file from server
    Response.Redirect(returnUrl);
    Response.Redirect("/");
}

I cannot find the way I can do that correctly. I tried a lot of approaches, but nothing helped. The important note is I cannot use the intermediate page like download.aspx that is used only for downloading and then redirects to the necessary page. So, the approaches I used:

1.

Response.Redirect(returnUrl, false);
Response.Redirect("/");

Result: the file does not downloading, immediate redirect happens.

2.

Response.Redirect(returnUrl, false);
Response.Redirect("/", false);

Result: nothing happens.

3.

Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=" + returnUrl);
Response.TransmitFile(Server.MapPath("~" + returnUrl));
Response.End();
Response.Redirect("/");

Result: File is downloaded, but no redirect. When remove Response.End(); redirect happens, but file is not loading.

1. The previous variant with following changes: Added: Response.AddHeader("Refresh", "3; URL=/home.aspx");

Removed: Response.Redirect("/");

Result: File is downloading, but no refresh/redirect happens.

1. Used javascript for downloading file:

Response.Write("language='javascript'>window.location.assign('returnUrl','download', '');"); Response.Redirect("/");

Result: File is not loading, redirect happens. Replaced Response.Write parameters with "<script>alert('test');</script>". No alert appears, redirect happens.

Do you know, what's the problem?

解决方案

I've got help on asp.net forum, right here. I have placed the following code on the page the authorized user must be redirected:

<%--We use iframe and script below for downloading files by not authorized users via direct links--%>
<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        iframeFile.Attributes["src"] = Request.QueryString["file"];
    }
</script>

 <asp:Content ContentPlaceHolderID="masterContent" runat="server">

    <div>
        <iframe id="iframeFile" runat="server" style="display: none;"></iframe>
    </div>

In code-behind of sign in page I've written the following fragment for downloading files:

string returnUrl = Request.QueryString["ReturnUrl"];
if (!string.IsNullOrEmpty(returnUrl))
{
    Response.Redirect("/?file=" + Server.UrlEncode(returnUrl));
}

Now the problem is solved.

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