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   源码介绍

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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;
using System.IO.Ports;
using System.IO;

namespace SerialPortCommunication
{
    public partial class Form1 : Form
    {
        private SerialPort sp = new SerialPort();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string[] PortName = SerialPort.GetPortNames();
            cbPortName.Items.Clear();
            foreach (string str in PortName)
            {
                cbPortName.Items.Add(str);

            }
            cbPortName.SelectedIndex = 0;
            cbBaudRate.SelectedIndex = 1;
            cbDataBit.SelectedIndex = 3;
            cbParityBit.SelectedIndex = 0;
            cbStopBit.SelectedIndex = 1;
            sp.Close();
            updateText = new UpdateTextEventHandler(UpdateTextBox);  //实例化委托对象

            sp.DataReceived  = new System.IO.Ports.SerialDataReceivedEventHandler(sp_DataReceived);
        }

        private void cbPortName_SelectedIndexChanged(object sender, EventArgs e)
        {

            sp.PortName = cbPortName.Items[cbPortName.SelectedIndex].ToString();

        }

        private void cbBaudRate_SelectedIndexChanged(object sender, EventArgs e)
        {

            sp.BaudRate = int.Parse(cbBaudRate.Items[cbBaudRate.SelectedIndex].ToString());

        }

        private void cbDataBit_SelectedIndexChanged(object sender, EventArgs e)
        {

            sp.DataBits = int.Parse(cbDataBit.Items[cbDataBit.SelectedIndex].ToString());
        }

        private void cbStopBit_SelectedIndexChanged(object sender, EventArgs e)
        {
            sp.StopBits = (StopBits)(cbStopBit.SelectedIndex);
        }

        private void cbParityBit_SelectedIndexChanged(object sender, EventArgs e)
        {
            sp.Parity = (Parity)System.Enum.Parse(typeof(Parity), (cbParityBit.SelectedIndex).ToString());
        }



        delegate void UpdateTextEventHandler(string text);  //委托，此为重点
        UpdateTextEventHandler updateText;
   
        private void button1_Click(object sender, EventArgs e)
        {  if(!sp.IsOpen)
            sp.Open(); 
        }

        private void button2_Click(object sender, EventArgs e)
        {
            sp.Close();
        }
        public void sp_DataReceived(object sender,System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            System.Threading.Thread.Sleep(100); 
            string readString = sp.ReadExisting();
            this.Invoke(updateText, new string[] { readString });
        }

        private void UpdateTextBox(string text)
        {
            textBox1.Text = text;
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            sp.Close();
        }

        
    }
}