C# 串口接收数据

using System;
using System.IO.Ports;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace Serial
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //初始化串口信息
        SerialPort sp =new SerialPort("COM3", 9600, Parity.None, 8, StopBits.One);
        private void Form1_Load(object sender, EventArgs e)
        {
            sp.DataReceived += Sp_DataReceived;  //注册接收事件
            sp.ReceivedBytesThreshold = 1;  //接收到一个字节就触发事件
            sp.Encoding = Encoding.Default;  //设置编码，避免中文乱码
            sp.Open();  //打开串口
        }

        //接收方法
        private void Sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //数据接收完整性
            //这里不知道是用延时好，还是循环读取缓冲区好，待验证……
            //Thread.Sleep(50);
            string data = string.Empty;
            while (sp.BytesToRead > 0)
            {
                data += sp.ReadExisting();  //数据读取,直到读完缓冲区数据
            }

            //更新界面内容时UI不会卡
            this.Invoke((EventHandler) delegate
            {
                //定义一个textBox控件用于接收消息并显示
                textBox1.AppendText(data + Environment.NewLine);
            });
        }
    }
}