将字符串转换成十六进制

 private byte[] GetValidByte()//获取发送的字节流
        {
            string[] strHEX = richTextBox_Send_1.Text.Split(" ".ToCharArray());
            byte[] byteData = new byte[strHEX.Length];
            try
            {
                for (int i = 0; i < strHEX.Length; i++)
                {
                    byteData[i] = byte.Parse(strHEX[i], System.Globalization.NumberStyles.HexNumber);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            return byteData;

        }