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   源码介绍

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using System;
using System.IO.Ports;
using System.Linq;
using System.Windows.Forms;

//使用C#自带serialPort控件进行串口编程94011.com.cn
namespace serialport
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            //使用委托进行跨线程读取数据
          Invoke
           (new EventHandler
             (delegate 
              {
                txtreceived.Text  = comport .ReadExisting ();
              } 
             )
            );
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           foreach (string com in System .IO .Ports .SerialPort.GetPortNames ()) //自动获取串行口名称

                cmbPortName.Items.Add(com);
            cmbPortName.SelectedIndex = 0;
        }

        private void btnopen_Click(object sender, EventArgs e)
        {
            try
            {
                if (comport.IsOpen) comport.Close();
                else
                {
                    // Set the port's settings
                    comport.BaudRate = int.Parse(cmbBaudRate.Text);
                    comport.DataBits = int.Parse(cmbDataBits.Text);
                    comport.StopBits = (StopBits)Enum.Parse(typeof(StopBits), cmbStopBits.Text);
                    comport.Parity = (Parity)Enum.Parse(typeof(Parity), cmbParity.Text);
                    comport.PortName = cmbPortName.Text;

                    // Open the port
                    comport.Open();
                }
                gbPortSettings.Enabled = !comport.IsOpen;
                txtsend.Enabled = btnsend.Enabled = comport.IsOpen;

                if (comport.IsOpen) btnopen.Text = "&C关闭端口";
                else btnopen.Text = "&O打开端口";
                if (comport.IsOpen) txtsend.Focus();
            }
            catch (Exception er)
            {  MessageBox .Show ("端口打开失败！" er.Message ,"提示");}


        }

        private void btnsend_Click(object sender, EventArgs e)
        {
           for (int i=0;i< txtsend .Lines .Count() ;i  )
            comport.WriteLine(txtsend.Lines [i]);
        }
       
        private void btnexit_Click(object sender, EventArgs e)
        {
           Close();
        }

        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            System.Diagnostics.Process.Start("http://94011.info");
        }
    }
}