How to handle paths to files with extra parameters in C#?

Question

I'm downloading files from the Internet inside of my application. Now I'm dealing with multiple file types so I need to able to detect what file type the file is before my application can continue. The problem that I ran into is that some of the URLs where the files are getting downloaded from contain extra parameters.

For example:

http://www.myfaketestsite.com/myaudio.mp3?id=20

Originally I was using String.EndsWith(). Obviously this doesn't work anymore. Any idea on how to detect the file type?

An alternative to parsing might be Response.ContentType

Brandon Copeland
– Brandon Copeland

2011-10-12 21:38:47 +00:00
Commented Oct 12, 2011 at 21:38 — Brandon Copeland
– Brandon Copeland, Commented Oct 12, 2011 at 21:38

Community · Accepted Answer · 2017-05-23 12:27:33Z

Wrap the URL in a Uri class. It will split it up into different segments that you can use, or you can use the helper methods on the Uri class itself:

var uri = new Uri("http://www.myfaketestsite.com/myaudio.mp3?id=20"); string path = uri.GetLeftPart(UriPartial.Path); // path = "http://www.myfaketestsite.com/myaudio.mp3"

Your question is a duplicate of:

What method should I use to accomplish this. Do I get the Query property and remove it from the original path?
@loyalpenguin: If you use the code above, the path variable will contain http://www.myfaketestsite.com/myaudio.mp3.

George Johnston · Accepted Answer · 2011-10-12 19:55:36Z

You could always split on the question mark to eliminate the parameters. e.g.

string s = "http://www.myfaketestsite.com/myaudio.mp3?id=20"; string withoutQueryString = s.Split('?')[0];

If no question mark exists, it won't matter, as you'll still be grabbing the value from the zero index. You can then do your logic on the withoutQueryString string.

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