c# 实现简单的串口通讯

private void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
  {
   this.Invoke(new EventHandler(UpdateUIText));
  }

private void UpdateUIText(object s, EventArgs e)
  {
   try
   {
    //必须要阻塞线程一段时间，以免在交易超时的情况下，由于read太快导致读取不完整
    System.Threading.Thread.Sleep(500);
    string txt = serialPort.ReadExisting();
    txt_Received.Text = txt;
   }
   catch (Exception ex)
   {
    MessageBox.Show(ex.Message.ToString());
   }   
  }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace WinForm串口通讯
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
             
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            string[] ports = System.IO.Ports.SerialPort.GetPortNames();
            if (ports.Length == 0)
            {
                MessageBox.Show("本机没有串口！");
            }
            Array.Sort(ports);
            serialPort.PortName = ports[0];//串口号COM3
            serialPort.BaudRate = 115200;//波特率
            serialPort.DataBits = 8;//数据位
            serialPort.StopBits = System.IO.Ports.StopBits.One;//停止位
            serialPort.Encoding = System.Text.Encoding.GetEncoding("GB2312");//此行非常重要，解决接收中文乱码的问题
 
            // 打开串口
            try
            {
                serialPort.Open();
            }
            catch (Exception ex)
            {
                //捕获到异常信息，创建一个新的comm对象，之前的不能用了。  
                serialPort = new System.IO.Ports.SerialPort();
                //将异常信息传递给用户。  
                MessageBox.Show(ex.Message);
                return;
            }
        }
 
        private void button1_Click(object sender, EventArgs e)
        {          
            string msgOrder = txt_Msg.Text;
            //MessageBox.Show(msgOrder);
            serialPort.Write(msgOrder);           
        }
 
 
        private void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            this.Invoke(new EventHandler(UpdateUIText));
        }
 
        private void UpdateUIText(object s, EventArgs e)
        {
            try
            {
                //必须要阻塞线程一段时间，以免在交易超时的情况下，由于read太快导致读取不完整
                System.Threading.Thread.Sleep(500);
                string txt = serialPort.ReadExisting();
                txt_Received.Text = txt;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
             
        }
 
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            try
            {
                if (serialPort != null && serialPort.IsOpen)
                {
                    serialPort.Close();
                    serialPort.Dispose();
                }
            }
            catch (Exception ex)
            {
                //将异常信息传递给用户。  
                MessageBox.Show(ex.Message);
                return;
            }
        }
 
         
    }
}