/// <summary>

        /// 文件名唯一（A.txt => An.txt）

        /// </summary>

        /// <param name="fullName">文件名</param>

        /// <returns></returns>

        private string SingleFullName(string fullName)

        {

            string newfullName = fullName;

            FileInfo fileInfo = new FileInfo(newfullName);

            if (fileInfo.Exists)

            {

                int i = 1;

                string fileName = fileInfo.Name;

                string fileExt = fileInfo.Extension;

                int extIndex = fileName.LastIndexOf(fileExt);

                string name = fileName.Substring(0,extIndex);

                newfullName = name + i + fileExt;

                while (true)

                {

                    fileInfo = new FileInfo(newfullName);

                    if (fileInfo.Exists)

                    {

                        i++;

                        newfullName = name + i + fileExt;

                    }

                    else

                    {

                        break;

                    }

                }

            }

            return newfullName;

        }