C# 保存文件如有重名在原名后加（*）

      private string GetNewPathForDupes(string path)
        {
            string directory = Path.GetDirectoryName(path);
            string filename = Path.GetFileNameWithoutExtension(path);
            string extension = Path.GetExtension(path);
            int counter = 1;
            string newFullPath;
            do
            {
                //string newFilename = "{0}({1}).{2}".FormatWith(filename, counter, extension);
                string newFilename = string.Format("{0}({1}).{2}", filename, counter, extension);
                newFullPath = Path.Combine(directory, newFilename);
                counter++;
            } while (System.IO.File.Exists(newFullPath));
            return newFullPath;
        }