C# 简单字符串加密与解密

 public static  string encode(string str)
        {
            string htext = "";
 
            for (int i = 0; i < str.Length; i++)
            {
                htext = htext + (char)(str[i] + 10 - 1 * 2);
            }
            return htext;
        }
 
        public static string decode(string str)
        {
            string dtext = "";
 
            for (int i = 0; i < str.Length; i++)
            {
                dtext = dtext + (char)(str[i] - 10 + 1 * 2);
            }
            return dtext;
        }

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