将字符串"123456"转换成"1,2,3,4,5,6"

        /// <summary>
        /// 将字符串"123456"转换成"1,2,3,4,5,6"
        /// </summary>
        /// <param name="code">要转换的字符串</param>
        /// <returns>转换结果</returns>
        protected string ConvertString(string code)
        {
            string result = string.Empty;
            for (int i = 0; i < code.Length; i++)
            {
                result += string.Format("{0},", code.Substring(i, 1));
            }
            return result.Remove(result.Length - 1);
        }