C#串口通讯

【实例截图】

【核心代码】

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;
using System.IO.Ports;
using System.Text.RegularExpressions;


namespace 串口2
{
    public partial class Form1 : Form
    {
        SerialPort sp=new SerialPort();
        private bool Listening = false;
        private bool Closing1 = true;
        private StringBuilder builder =new StringBuilder();
        private long received_count = 0;//接收计数；

       

        public Form1()
        {
          InitializeComponent();
        }

        private void Form1_Load()
        {
           string[] ports = SerialPort.GetPortNames();
           Array.Sort(ports);
           cmbPortName.Items.AddRange(ports);
           cmbPortName.SelectedIndex=cmbPortName.Items.Count>0?0:-1;
           sp.BaudRate = 9600;
          sp.StopBits = StopBits.One;
         sp.DataBits = 8;
           sp.Parity = Parity.None;//设置串口属性
           sp.ReceivedBytesThreshold =1;//设置 DataReceived 事件发生前内部输入缓冲区中的字节数
         
           this.sp.DataReceived  = new SerialDataReceivedEventHandler(this.sp_DataReceived);//注册事件
        }

        void sp_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            if (Closing1) return;
            try
            {
              Listening = true;
              int n = sp.BytesToRead;
              byte[] buf = new byte[n];
              received_count  = n;
              sp.Read(buf, 0, n);
              builder.Clear();
              this.Invoke((EventHandler)(delegate
               {
                     builder.Append(Encoding.ASCII.GetString(buf)); 
                     this.txtReceive.AppendText(builder.ToString());
                 
                }));
              
            }
            finally
            {
                Listening = false;
            }
        }

        
        private void btnOpen_Click_1(object sender, EventArgs e)
        {
           if (Closing1)
            {
                Closing1 = false;
                Form1_Load();
                try
                {
                    sp.Open();
                }
                catch (Exception ex)
                {
                    sp = new SerialPort();
                    MessageBox.Show(ex.Message);
                }
            }
        }

        private void btnSend_Click_1(object sender, EventArgs e)
        {
            if (!Closing1)
            {
                sp.Write(txtSend.Text);
            }
        }
        private void btnClose_Click_1(object sender, EventArgs e)
        {
            Closing1 = true;
            while (Listening) Application.DoEvents();
            received_count=0;
            sp.Close();
        }

        private void btnExit_Click_1(object sender, EventArgs e)
        {
            sp.Close();
            this.Close();
        }

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

    }
}