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;

namespace _2
{
    public partial class Form1 : Form
    {
      
        SerialPort spReceive = new SerialPort ();
        delegate void UpdateTextEventHandler(string text);//声明一个委托
        UpdateTextEventHandler updateText;//创建一个委托实例
        string str;
        public Form1()
        {
            InitializeComponent();
            updateText = new UpdateTextEventHandler(UpdateTextBox);
           
           
            spReceive.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(spReceive_DataReceived );  
           
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            spReceive.PortName = "COM5";
            spReceive.BaudRate = 2400;
            spReceive.DataBits = 8;
            spReceive.StopBits = StopBits.One;
            spReceive.Parity = Parity.Even;
            string str = "FEFEFE68AAAAAAAAAAAA681300DF16";
            spReceive.Open();
            spReceive.Write(HexToByte (str ),0,HexToByte (str).Length );

 public void  spReceive_DataReceived(object sender,System .IO .Ports .SerialDataReceivedEventArgs e)
       {
                   
          string readString = spReceive.ReadExisting();
          this.Invoke(updateText ,new string []{readString });
          
       }
 private void  UpdateTextBox(string text)
        {
          textBox1.Text =str ; 
            
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            spReceive.Close();
        }

        private static byte[] HexToByte(string hexString)//字串符转换成16进制byte[]
        {
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            return returnBytes;
        }

上面代码已经实现向串口发送数据,串口也正确的返回数据了(用串口监控软件已经监控到数据的正常发送和返回)怎么把串口返回的数据显示在textBox1上?返回数据是一组16进制的byte[]例:返回的是68 11 11 11 11 11 11 68 00 在 textBox1上也显示68 11 11 11 11 11 11 68 00