串口通信DataReceived的值怎么传出

Question

请教下各位大佬，在方法A中，我绑定了port.DataReceived事件，触发事件后我获取到了串口通信的值并转化为 string a，我想在方法A中将a的值当作返回值return要怎么写?大概过程如下，新人对事件委托这些有点搞不清楚，麻烦大佬指点指点public static stringA()
{
            ...........
            port.Open();
            port.DataReceived += Port_DataReceived;
            return a; //此处希望能将a的值传出
}
private static void Port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
            byte[] portdata = new byte[10];
            port.Read(portdata, 0, 10);
            a = Encoding.UTF8.GetString(portdata);
 }

Answer 1

        private SerialPort serialport = new SerialPort();
        private StringBuilder builder = new StringBuilder();
       // private StringBuilder bs = new StringBuilder();//用于存储一条完整信息;
        Boolean ope = false;
 
        public Form1()
        {
            InitializeComponent();
            Control.CheckForIllegalCrossThreadCalls = false;
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            string[] names = SerialPort.GetPortNames();
            if (names == null)
            {
                MessageBox.Show("没有可用的串口", "提示");
            }
            else
            {
                foreach (string str in names)
                {
                    toolStripComboBox2_Potrs.Items.Add(str);
                }
            }
            toolStripComboBox1_Rate.Text = "9600";
            toolStripComboBox1_Rate.Items.Add("4800");
            toolStripComboBox1_Rate.Items.Add("9600");
            //添加事件注册
            serialport.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataRecived);
 
 
 
        }
 
        void serialPort_DataRecived(object sender, SerialDataReceivedEventArgs e)
        {
            Thread.Sleep(500);
            builder.Clear();//清除字符串构造器的内容
            string str = "";
            int n = serialport.BytesToRead;//先记录下来，避免丢失
            label3.Text = n.ToString();
            
            byte[] buf = new byte[n];
            serialport.Read(buf, 0, n);//读取缓冲区数据
            
            this.Invoke((EventHandler)(delegate
            {
                if (checkBox1_Hex.Checked)
                {
                    foreach (byte b in buf)
                    {
                        builder.Append(b.ToString("X2") + " ");
                        
                    }
                }
                else
                {
                    //直接以ASCII规则输出
                    builder.Append(Encoding.ASCII.GetString(buf));
                  //  bs.Append(Encoding.ASCII.GetString(buf));
 
                }
                //追加文本
                this.textBox1_ReciMes.AppendText(builder.ToString());
                //create a new thread
                //;
                Thread t = new Thread(new ParameterizedThreadStart(Options));
                Console.WriteLine(builder.ToString());
                t.Start(builder.ToString());
            }));
            
        }