c# - Get filename while downloading it

Question

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

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

There's only one issue that I am facing:

How can I get the real filename?

My code looks like this atm:

WebClient client = new WebClient ();

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

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

All I know is the id.

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

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

Answer 1

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...
}

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.