How to get relative path from absolute path

Question

There\'s a part in my apps that displays the file path loaded by the user through OpenFileDialog. It\'s taking up too much space to display the whole path, but I don\'t want

Answer 1

This should work:

private string rel(string path) {
  string[] cwd  = new Regex(@"[\\]").Split(Directory.GetCurrentDirectory());
  string[] fp   = new Regex(@"[\\]").Split(path);

  int common = 0;

  for (int n = 0; n < fp.Length; n++) {
    if (n < cwd.Length && n < fp.Length && cwd[n] == fp[n]) {
      common++;
    }
  }

  if (common > 0) {
    List rp = new List();

    for (int n = 0; n < (cwd.Length - common); n++) {
      rp.Add("..");
    }

    for (int n = common; n < fp.Length; n++) {
      rp.Add(fp[n]);
    }

    return String.Join("/", rp.ToArray());
  } else {
    return String.Join("/", fp);
  }
}