下载时获取文件名 [英] Get filename while downloading it

问题描述

我们提供保存在我们的数据库中的文件，唯一的方法是通过他们的 id ，如下所示：

We are providing files that are saved in our database and the only way to retrieve them is by going by their id as in:

www.AwesomeURL.com/AwesomeSite.aspx?requestedFileId=23

一切都是正在使用 WebClient Class 的工作文件。

Everything is working file as I am using the WebClient Class.

我只面对一个问题：

如何获得真实 filename？

How can I get the real filename?

我的代码看起来像这个atm：

My code looks like this atm:

WebClient client = new WebClient ();

string url = "www.AwesomeURL.com/AwesomeSite.aspx?requestedFileId=23";

client.DownloadFile(url, "IDontKnowHowToGetTheRealFileNameHere.txt");

我知道的只是 id 。

当我尝试从浏览器访问 url 时，不会发生这种情况，它的正确名称=> DownloadedFile.xls

This does not happen when I try accessing url from the browser where it get's the proper name => DownloadedFile.xls.

获得正确答案的正确方式是什么？

What's the proper way to get the correct response?

推荐答案

我有同样的问题，我发现这个类： System.Net.Mime.ContentDisposition 。

I had the same problem, and I found this class: System.Net.Mime.ContentDisposition.

using (WebClient client = new WebClient()){
    client.OpenRead(url);

    string header_contentDisposition = client.ResponseHeaders["content-disposition"];
    string filename = new ContentDisposition(header_contentDisposition).FileName;

    ...do stuff...
}

类文档表明它适用于电子邮件附件，但在我以前测试的服务器上工作正常，避免解析非常好。

The class documentation suggests it's intended for email attachments, but it works fine on the server I used to test, and it's really nice to avoid the parsing.

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