System.Configuration.UrlPath.IsEqualOrSubdirectory C# (CSharp) Метод

        internal static bool IsEqualOrSubdirectory(string dir, string subdir) {
            if (String.IsNullOrEmpty(dir))
                return true;

            if (String.IsNullOrEmpty(subdir))
                return false;

            //
            // Compare up to but not including trailing backslash
            //
            int lDir = dir.Length;
            if (dir[lDir - 1] == '\\') {
                lDir -= 1;
            }

            int lSubdir = subdir.Length;
            if (subdir[lSubdir - 1] == '\\') {
                lSubdir -= 1;
            }

            if (lSubdir < lDir)
                return false;

            if (String.Compare(dir, 0, subdir, 0, lDir, StringComparison.OrdinalIgnoreCase) != 0)
                return false;

            // Check subdir that character following length of dir is a backslash
            if (lSubdir > lDir && subdir[lDir] != '\\')
                return false;

            return true;
        }