从重定向页面下载文件

Question

How would I go about downloading a file from a redirection page (which itself does some calculations based on the user).

For example, if I wanted the user to download a game, I would use WebClient and do something like:

client.DownloadFile("http://game-side.com/downloadfetch/");

It's not as simple as doing

client.DownloadFile("http://game-side.com/download.exe");

But if the user were to click on the first one, it would redirect and download it.

Answer 1

I think, you should go with slightly customized WebClient class like that. It will follow code 300 redirects:

public class MyWebClient : WebClient
{
    protected override WebResponse GetWebResponse(WebRequest request)
    {
        (request as HttpWebRequest).AllowAutoRedirect = true;
        WebResponse response = base.GetWebResponse(request);
        return response;
    }
}
...
WebClient client=new MyWebClient();
client.DownloadFile("http://game-side.com/downloadfetch/", "download.zip");

Answer 2

As far as I know this isn't possible with DownloadFile();

You could use this

HttpWebRequest myHttpWebRequest=(HttpWebRequest)WebRequest.Create("http://game-side.com/downloadfetch/");    
myHttpWebRequest.MaximumAutomaticRedirections=1;
myHttpWebRequest.AllowAutoRedirect=true;
HttpWebResponse myHttpWebResponse=(HttpWebResponse)myHttpWebRequest.GetResponse();

See also

Download file through code that has a redirect?