解析Asp.net,C# 纯数字加密解密字符串的应用

/// <summary>
        /// 将字符串转换成数字字符串
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        private static string ConvertStringToNumbers(string value)
        {
            StringBuilder sb = new StringBuilder();

            foreach (char c in value)
            {
                int cAscil = (int)c;
                sb.Append(Convert.ToString(c, 8) + "9");
            }

            return sb.ToString();
        }

string encryptedNumberString = ConvertStringToNumbers(encryptedString);

encryptedNumberString =11697091549101914191109115910691649123

91019121914791419146963953912291259106915691479759759

/// <summary>
        /// 将数字字符串转换成普通字符字符串
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        private static string ConvertNumbersToString(string value)
        {
            string[] splitInt = value.Split(new char[] { '9' }, StringSplitOptions.RemoveEmptyEntries);

            var splitChars = splitInt.Select(s => Convert.ToChar(
                                              Convert.ToInt32(s, 8)
                                            ).ToString());

            return string.Join("", splitChars);
        }