detecting if a file is an archive using 7zip

Question

I would like to use SevenZipSharp in order to determine if a file is an archive. I know that it's possible because in explorer if I rename a .zip to .bmp, 7zip still recognises it as an archive.

--edit: In other words, I want 7zip to tell me if a file (no matter the extension) contains some kind of supported archive (zip, tar, rar, iso etc.)

Thanks, Fidel

Answer 1

static bool IsArchive(string filename)
{
    bool result = false;
    try
    {
        new ArchiveFile(File.OpenRead(filename));
        result = true;
    }
    catch
    {
        //log if you're going to do something about it
    }
    return result;
}