字符串/16进制/ASCII码的转换

        /// <字符串转16进制格式,不够自动前面补零>
        /// 假设文本框里面填写的是：01 02 03 04 05 06
        /// Str获取的是01 02 03 04 05 06 是字符串
        /// 需要将01转为0x01，02转为0x02
        /// 首先默认把文本框每隔两个字符作为一个16进制数
        /// 假设文本框中是010203040506(偶数个数据)，则01,02,03,04,05,06分别作为16进制
        /// 如果文本框中的字符个数是奇数个1115268，则默认先把前面每隔两个作为一个16进制数，最后一个数前面补零0x11,0x15,0x26,0x08
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns>返回字符数组</returns>
        public static byte[] strToToHexByte(String hexString) {
            int i;
            hexString = hexString.Replace(" ", "");//清除空格
            if ((hexString.Length % 2) != 0)//奇数个
            {
                byte[] returnBytes = new byte[(hexString.Length + 1) / 2];
                try {
                    for (i = 0; i < (hexString.Length - 1) / 2; i++) {
                        returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
                    }
                    returnBytes[returnBytes.Length - 1] = Convert.ToByte(hexString.Substring(hexString.Length - 1, 1).PadLeft(2, '0'), 16);
                } catch {
                    MessageBox.Show("含有非16进制字符", "提示");
                    return null;
                }
                return returnBytes;
            } else {
                byte[] returnBytes = new byte[(hexString.Length) / 2];
                try {
                    for (i = 0; i < returnBytes.Length; i++) {
                        returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
                    }
                } catch {
                    MessageBox.Show("含有非16进制字符", "提示");
                    return null;
                }
                return returnBytes;
            }
        }
        /// <summary>
        /// 将字符串s通过ASCII码转换为16进制字符串
        /// </summary>
        /// <param name="s"></param>
        /// <param name="encode"></param>
        /// <returns>十六进制字符串</returns>
        private static string result;//string转16进制的结果
        public static string stringToHexString(string s, Encoding encode) {
            byte[] b = encode.GetBytes(s);//按照指定编码将string编程字节数组
            result = string.Empty;
            for (int i = 0; i < b.Length; i++)//逐字节变为16进制字符
            {
                result += Convert.ToString(b[i], 16);
            }
            return result;
        }

        /// <summary>
        /// 将一条十六进制字符串转换为ASCII
        /// </summary>
        /// <param name="hexstring">一条十六进制字符串</param>
        /// <returns>返回一条ASCII码</returns>
        public static string hexStringToASCII(string hexstring) {
            byte[] bt = hexStringToBinary(hexstring);
            string lin = "";
            for (int i = 0; i < bt.Length; i++) {
                lin = lin + bt[i] + " ";
            }
            string[] ss = lin.Trim().Split(new char[] { ' ' });
            char[] c = new char[ss.Length];
            int a;
            for (int i = 0; i < c.Length; i++) {
                a = Convert.ToInt32(ss[i]);
                c[i] = Convert.ToChar(a);
            }
            string b = new string(c);
            return b;
        }
        /// <summary>
        /// 16进制字符串转换为二进制数组
        /// </summary>
        /// <param name="hexstring">用空格切割字符串</param>
        /// <returns>返回一个二进制字符串</returns>
        public static byte[] hexStringToBinary(string hexstring) { 
            string[] tmpary = hexstring.Trim().Split(' ');
            byte[] buff = new byte[tmpary.Length];
            for (int i = 0; i < buff.Length; i++) {
                buff[i] = Convert.ToByte(tmpary[i], 16);
            }
            return buff;
        }