C# 串口扫描枪读取数据的实现

/// <summary>
    /// 扫描枪（串口 ）工作类
    /// </summary>
    public class CommBar : IDisposable
    {
        /// <summary>
        /// 串口引用
        /// </summary>
        public SerialPort serialPort;

        /// <summary>
        /// 存储转换的数据值
        /// </summary>
        public string Code { get; set; }

        /// <summary>
        /// 扫描枪（串口 ）工作类
        /// </summary>
        public CommBar()
        {
            serialPort = new SerialPort();
        }

        /// <summary>
        /// 串口状态
        /// </summary>
        public bool IsOpen
        {
            get
            {
                return serialPort.IsOpen;
            }
        }

        /// <summary>
        /// 打开串口
        /// </summary>
        /// <returns></returns>
        public bool Open()
        {
            if (serialPort.IsOpen)
            {
                Close();
            }
            serialPort.Open();
            if (serialPort.IsOpen)
            {
                return true;
            }
            else
            {
                MessageBox.Show("串口打开失败！");
                return false;
            }
        }

        /// <summary>
        /// 关闭串口
        /// </summary>
        public void Close()
        {
            serialPort.Close();
        }

        /// <summary>
        /// 写入数据
        /// </summary>
        /// <param name="send">数据</param>
        /// <param name="offSet">偏移量</param>
        /// <param name="count">字节数</param>
        public void WritePort(byte[] send, int offSet, int count)
        {
            if (IsOpen)
            {
                serialPort.Write(send, offSet, count);
            }
        }

        /// <summary>
        /// 获取可用串口
        /// </summary>
        /// <returns>串口名称列表</returns>
        public string[] GetComName()
        {
            string[] names = null;
            try
            {
                names = SerialPort.GetPortNames(); // 获取所有可用串口的名字
            }
            catch (Exception)
            {
                System.Windows.Forms.MessageBox.Show("找不到串口");
            }
            return names;
        }

        /// <summary>
        /// 注册一个串口
        /// </summary>
        /// <param name="portName">端口号</param>
        /// <param name="baudRate">波特率</param>
        public void SerialPortValue(string portName, int baudRate)
        {
            //串口名
            serialPort.PortName = portName;
            //波特率
            serialPort.BaudRate = baudRate;
            //数据位
            serialPort.DataBits = 8;
            //两个停止位
            serialPort.StopBits = System.IO.Ports.StopBits.One;
            //无奇偶校验位
            serialPort.Parity = System.IO.Ports.Parity.None;
            serialPort.ReadTimeout = 100;
            //commBar.serialPort.WriteTimeout = -1;
        }

        #region 实现IDisposable

        private bool m_disposed = false;//标识资源是否被释放过

        /// <summary>
        /// 释放
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);//防止Finalize调用
        }

        /// <summary>
        /// 释放
        /// </summary>
        /// <param name="disposing"></param>
        protected virtual void Dispose(bool disposing)
        {
            if (!m_disposed)
            {
                if (disposing)
                {
                    //释放托管资源
                    serialPort.Close();
                }
                //释放非托管资源
                m_disposed = true;
            }
        }

        /// <summary>
        /// 析构函数
        /// </summary>
        ~CommBar()
        {
            Dispose(false);
        }

        #endregion
    }

CommBar commBar;
        public Form2()
        {
          InitializeComponent();
            commBar = new CommBar();
            //注册一该串口
            commBar.SerialPortValue("COM1", 9600);
            //打开串口
            if (commBar.Open())
                //关联事件处理程序
                commBar.serialPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(serialPort_DataReceived);
        }

//委托，指向CodeText方法
        private delegate void ModifyButton_dg(CommBar commBar);

        //串口接收接收事件处理程序
        //每当串口讲到数据后激发
        void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            System.Threading.Thread.Sleep(100);
            byte[] m_recvBytes = new byte[commBar.serialPort.BytesToRead];//定义缓冲区大小
            int result = commBar.serialPort.Read(m_recvBytes, 0, m_recvBytes.Length);//从串口读取数据
            if (result <= 0)
                return;
            commBar.Code = Encoding.ASCII.GetString(m_recvBytes, 0, m_recvBytes.Length);//对数据进行转换
            this.Invoke(new ModifyButton_dg(CodeText), commBar);//调用委托，将值传给文本框
            commBar.serialPort.DiscardInBuffer();
        }

//用来为文本框赋值
        private void CodeText(CommBar commBar)
        {
          //加逻辑判断等
            this.txt_ASN.Text = commBar.Code;
               
        }

this.lbl_error.Text = "ASN码已存在！";
  this.lbl_error.Visible = true;
  System.Threading.Tasks.Task.Delay(3000).ContinueWith(_ =>
   {
      Invoke(new MethodInvoker(() => {
      lbl_error.Visible = false;

       }));
   });