基本通信可以啦，嘿嘿

参考了各位大侠的帖子，参考了一堆资料，也算手把手得教会了一点点。也明白了大概的思路。

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication6
{
    public partial class Form1 : Form
    {
      
        public Form1()
        {
            InitializeComponent();
        }
      
        private void Form1_Load(object sender, EventArgs e)
        {
            serialPort.BaudRate = 9600;
            serialPort.PortName = "COM1";
            if (!serialPort.IsOpen)
            {
                serialPort.Close();
                serialPort.Open();
            }
        }

        private void SenBut_Click(object sender, EventArgs e)
        {
            serialPort.Write(this.SenBox.Text);
            MessageBox.Show("数据发送成功", "系统提示");
        }

        private void RevBut_Click(object sender, EventArgs e)
        {
            int nByteNum = serialPort.BytesToRead;
            byte[] arraybyte = new byte[nByteNum];
            serialPort.Read(arraybyte, 0, nByteNum);
            RevBox.Text = Encoding.UTF8.GetString(arraybyte);
            MessageBox.Show("数据接收完毕", "系统提示");
        }
    }
}