/// 
    /// 从汉字转换到16进制    /// 
    ///     /// 
         public static string GetHexFromChs(string s)    {        if ((s.Length % 2) != 0)        {            s += " ";//空格            //throw new ArgumentException("s is not valid chinese string!");        }        System.Text.Encoding chs = System.Text.Encoding.GetEncoding("gb2312");        byte[] bytes = chs.GetBytes(s);        string str = "";        for (int i = 0; i < bytes.Length; i++)        {            str += string.Format("{0:X}", bytes[i]);        }        return str;    }    /// 
    /// 从16进制转换成汉字    /// 
    ///     /// 
         public static string GetChsFromHex(string hex)    {        if (hex == null)            throw new ArgumentNullException("hex");        if (hex.Length % 2 != 0)        {            hex += "20";//空格            //throw new ArgumentException("hex is not a valid number!", "hex");        }        // 需要将 hex 转换成 byte 数组。        byte[] bytes = new byte[hex.Length / 2];        for (int i = 0; i < bytes.Length; i++)        {            try            {                // 每两个字符是一个 byte。                bytes[i] = byte.Parse(hex.Substring(i * 2, 2),                    System.Globalization.NumberStyles.HexNumber);            }            catch            {                // Rethrow an exception with custom message.                throw new ArgumentException("hex is not a valid hex number!", "hex");            }        }        // 获得 GB2312，Chinese Simplified。        System.Text.Encoding chs = System.Text.Encoding.GetEncoding("gb2312");        return chs.GetString(bytes);    }