C# - C# Ordner auslesen und in Liste speichern "rekursiv"

        public delegate void DirectoryHandler(DirectoryInfo info);

        public void GetFolders(DirectoryInfo root, ref IList<DirectoryInfo> folders, DirectoryHandler currentDirectory)
        {
            foreach(DirectoryInfo dir in root.GetDirectories())
            {
                try
                {
                    folders.Add(dir);

                    if(currentDirectory != null)
                        currentDirectory(dir);

                    this.GetFolders(dir, ref folders, currentDirectory);                    
                }
                catch(UnauthorizedAccessException)
                {
                    Debug.WriteLine("No Access! ->{0}", dir.FullName);
                }
            }
        }