替代Response.TransmitFile通过HTTP传送文件 [英] Alternative to Response.TransmitFile for transfering files via HTTP

问题描述

我工作的一个ASP.NET网站，允许用户下载文件。

I'm working on a ASP.NET website that allows users to download files.

以前的文件被存储在同一服务器的网站，所以我们可以在这样做：

Previously the files were stored on the same server as the website so we could do:

Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
Response.AddHeader("Content-Length", response.ContentLength.ToString());
Response.ContentType = "application/octet-stream";
Response.TransmitFile(path);
Response.End();

不过，现在的一些文件存储一个单独的服务器上。我可以验证文件是否存在使用

However, now some of the files are stored on a seperate server. I can verify that the files exist using

WebRequest request = WebRequest.Create(absolute-url);
WebResponse response = request.GetResponse();

但我怎么可以方便的传送作为的TransmitFile需要一个虚拟路径而不是URL？

But how can I facilitate the transfer as TransmitFile requires a virtual path not a url?

我需要的用户能够选择在哪里将文件保存为一个正常的Web下载

I need the users to be able to choose where to Save the file as with a normal web download

什么是最好的方法要做到这一点？

What's the best way to do this?

推荐答案

如果你可以通过Web请求的响应流中，你应该能够流复制到您的输出流按这个片段：

If you can get the response stream via a web request you should be able to copy the stream to your output stream as per this snippet:

while ((read = stream.Read(buffer, offset, chunkSize)) > 0)    
{

    Response.OutputStream.Write(buffer, 0, read);
    Response.Flush();
}

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