C# - Automatisches Umbenennen eines Pfades

using System;
using System.IO;

namespace ViperBytes.IO
{
    public class AutoRenamer
    {
        /// <summary>
        /// Returns a new, not existing path.
        /// On the end of the file / directory name will be attached a number
        /// </summary>
        /// <param name="path">The existing path</param>
        /// <returns>An alternative path wich not exists</returns>
        public static string AutoRename(string path)
        {
            if ((!File.Exists(path)) && (!Directory.Exists(path)))
                // the path doesn't exist, so return without attached counter
                return path;
            else if (path == Path.GetPathRoot(path))
                // the path is only a drive letter, so we can't attach something
                return path;

            // the returned alternative path
            string alternative = path;

            // the attach counter
            int count = 0;

            // specifyes, wheather an ending slash of directory was cutten
            bool cutSlash = false;

            // cut ending slash
            if (alternative[alternative.Length - 1] == Path.DirectorySeparatorChar)
            {
                alternative = alternative.Substring(0, alternative.Length - 1);

                // remember, because we have to replace it later
                cutSlash = true;
            }

            while ((File.Exists(alternative)) || (Directory.Exists(alternative)))
            {
                count++;

                // the attachment from count
                string attach = " (" + count.ToString() + ")";

                // cut extension if file exists
                if (File.Exists(alternative))
                    alternative = path.Substring(0, path.Length - Path.GetExtension(path).Length) + attach + Path.GetExtension(path);
                else
                    alternative = path + attach;
            }

            // if a slash was cutten, add it at the end
            if (cutSlash)
                alternative += Path.DirectorySeparatorChar;

            return alternative;
        }
    }
}