线程间操作无效: 从不是创建控件“listBox1”的线程访问它

Question

我用VS2005做个网络聊天程序，使用了多线程技术，但会出现这个异常，求高手们如何解决这个异常...原代码如下！
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace ChatServer
{
    public partial class Form1 : Form
    {
        private IPAddress myIP = IPAddress.Parse("127.0.0.1");
        private IPEndPoint myserver;
        private Socket sockets;
        private Socket acsocket;
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                myIP = IPAddress.Parse(textBox1.Text);
            }
            catch
            {
                MessageBox.Show("你输入的IP地址格式不正确！");
            }
            try
            {
                Thread thread = new Thread(new ThreadStart(accp));
                thread.Start();            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }        
        private void accp()
        {
            myserver = new IPEndPoint(myIP,Int32.Parse(textBox2.Text));
            sockets = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            sockets.Bind(myserver);
            sockets.Listen(50);
            listBox1.Items.Add("主机" + textBox1.Text + "端口" + textBox2.Text + "开始监听....\r\n");//为什么运行到这一部时会出现以上标题的这个异常呢？
            while (true)
            { 
                acsocket = sockets.Accept();
                if (acsocket.Connected)
                {
                    listBox1.Items.Add("与客户建立连接...");
                    Thread thread = new Thread(new ThreadStart(round));
                    thread.Start();
                }
            }
        }
        private void round()
        {
            while (true)
            {
                byte[] buffer=new byte[64];
                NetworkStream netstream = new NetworkStream(acsocket);
                netstream.Read(buffer,0,buffer.Length);
                string rec = Encoding.BigEndianUnicode.GetString(buffer);
                richTextBox1.AppendText(rec+"\r\n");
            }
        }        private void button2_Click(object sender, EventArgs e)
        {
            if (richTextBox2.Text == null)
            {
                MessageBox.Show("不能发送空消息！");
            }
            try
            {
                byte[] sendbyte = new byte[64];
                string send = richTextBox2.Text + "\r\n";
                NetworkStream netstream = new NetworkStream(acsocket);
                sendbyte = Encoding.BigEndianUnicode.GetBytes(send);
                netstream.Write(sendbyte, 0, sendbyte.Length);
            }
            catch
            {
                MessageBox.Show("连接没有建立！无法发送..");
            }
        }        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                sockets.Close();
                listBox1.Items.Add("主机" + textBox1.Text + "端口" + textBox2.Text + "停止监听...\r\n");
            }
            catch
            {
                MessageBox.Show("监听没有建立，无法关闭！");
            }
        }    }
}
同样客户端的程序也会出现此类问题，要如何解决？

Answer 1

使用委托吧
关键字 Delegate

Answer 2

在Form Load事件中加入
System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
是最简单的方式

Answer 3

UI上的控件不是线程安全的,所以跨线程的操作UI控件需要通过Invoke的方式:private object m_SyncObjectForListBox = new object();        private void UpdateListBox(ListBox control, string text)
        {
            if (control.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(UpdateListBox);
                this.Invoke(d, new object[] { control, text });
            }
            else
            {
                lock (m_SyncObjectForListBox)  
                {
                    control.Items.Add(text);
                }
            }
        }

Answer 4

楼主把你的代码: 
listBox1.Items.Add("主机" + textBox1.Text + "端口" + textBox2.Text + "开始监听....\r\n");改为调用上面的方法:
UpdateListBox(listBox1, "主机" + textBox1.Text + "端口" + textBox2.Text + "开始监听....\r\n");

Answer 5

把整个Form类的CheckForIllegalCrossThreadCalls 属性设为False

Answer 6

listener.Server.Close();
关闭端口，可以在下次打开该端口