字符串/16進制/ASCII碼的轉換

        /// <字符串轉16進制格式,不夠自動前面補零>
        /// 假設文本框里面填寫的是：01 02 03 04 05 06
        /// Str獲取的是01 02 03 04 05 06 是字符串
        /// 需要將01轉為0x01，02轉為0x02
        /// 首先默認把文本框每隔兩個字符作為一個16進制數
        /// 假設文本框中是010203040506(偶數個數據)，則01,02,03,04,05,06分別作為16進制
        /// 如果文本框中的字符個數是奇數個1115268，則默認先把前面每隔兩個作為一個16進制數，最后一個數前面補零0x11,0x15,0x26,0x08
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns>返回字符數組</returns>
        public static byte[] strToToHexByte(String hexString) {
            int i;
            hexString = hexString.Replace(" ", "");//清除空格
            if ((hexString.Length % 2) != 0)//奇數個
            {
                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進制字符", "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進制字符", "提示");
                    return null;
                }
                return returnBytes;
            }
        }
        /// <summary>
        /// 將字符串s通過ASCII碼轉換為16進制字符串
        /// </summary>
        /// <param name="s"></param>
        /// <param name="encode"></param>
        /// <returns>十六進制字符串</returns>
        private static string result;//string轉16進制的結果
        public static string stringToHexString(string s, Encoding encode) {
            byte[] b = encode.GetBytes(s);//按照指定編碼將string編程字節數組
            result = string.Empty;
            for (int i = 0; i < b.Length; i++)//逐字節變為16進制字符
            {
                result += Convert.ToString(b[i], 16);
            }
            return result;
        }

        /// <summary>
        /// 將一條十六進制字符串轉換為ASCII
        /// </summary>
        /// <param name="hexstring">一條十六進制字符串</param>
        /// <returns>返回一條ASCII碼</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進制字符串轉換為二進制數組
        /// </summary>
        /// <param name="hexstring">用空格切割字符串</param>
        /// <returns>返回一個二進制字符串</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;
        }