C#使用正则表达式来验证是否是16进制字符串

        /// <summary>
        /// 判断是否为16进制字符串
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        public static bool IsHexString(string hexString)
        {
            //十六进制发送时，发送框数据进行十六进制数据正则校验
            if (Regex.IsMatch(hexString, "^[0-9A-Fa-f]+$"))
            {
                //校验成功
                return true;
            }
            //校验失败
            return false;
        }

发送数据

 /// <summary>
        /// 发送数据
        /// </summary>
        private void SendData()
        {
            if (this.chk_HexSend.Checked)
            {
                //去掉空格  01 04   50
                string temp = this.rtb_Send.Text.Replace(" ", "");

                try
                {
                    byte[] b = HexHelper.HexStringToBytes(temp);

                    serialPort.Write(b, 0, b.Length);

                    TotalSendNum += b.Length;
                }
                catch (Exception ex)
                {
                    this.tssl_Status.Text = "发送失败：" + ex.Message;
                    IsOpen = false;
                }
            }

            else
            {
                try
                {
                    byte[] b = encoding.GetBytes(this.rtb_Send.Text);

                    serialPort.Write(b, 0, b.Length);

                    TotalSendNum += b.Length;
                }
                catch (Exception ex)
                {
                    this.tssl_Status.Text = "发送失败：" + ex.Message;
                    IsOpen = false;
                }
            }
        }