c# 监控5900 port哪个IP访问了这个IP就显示在Form里面如果断开了5900连接也显示在Form里面

下面是一个简单的示例代码，用于在C#中监控5900端口，显示访问和断开连接的IP地址在一个窗体（Form）中：

using System;
using System.Net;
using System.Net.Sockets;
using System.Windows.Forms;

namespace PortMonitor
{
    public partial class MainForm : Form
    {
        private TcpListener tcpListener;

        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            try
            {
                // 监听5900端口
                tcpListener = new TcpListener(IPAddress.Any, 5900);
                tcpListener.Start();

                // 异步接受客户端连接
                tcpListener.BeginAcceptTcpClient(AcceptCallback, null);

                // 显示监听信息
                LogMessage("Started listening on port 5900...");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: " + ex.Message);
            }
        }

        private void AcceptCallback(IAsyncResult ar)
        {
            try
            {
                // 接受客户端连接
                TcpClient client = tcpListener.EndAcceptTcpClient(ar);
                IPAddress clientIP = ((IPEndPoint)client.Client.RemoteEndPoint).Address;

                // 显示连接信息
                LogMessage("Connected client IP: " + clientIP);

                // 继续异步接受下一个客户端连接
                tcpListener.BeginAcceptTcpClient(AcceptCallback, null);

                // 异步接收客户端数据
                byte[] buffer = new byte[1024];
                client.GetStream().BeginRead(buffer, 0, buffer.Length, ReadCallback, new Tuple<TcpClient, byte[]>(client, buffer));
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: " + ex.Message);
            }
        }

        private void ReadCallback(IAsyncResult ar)
        {
            try
            {
                // 获取客户端和接收缓冲区
                Tuple<TcpClient, byte[]> state = (Tuple<TcpClient, byte[]>)ar.AsyncState;
                TcpClient client = state.Item1;
                byte[] buffer = state.Item2;

                // 读取客户端数据
                int bytesRead = client.GetStream().EndRead(ar);
                if (bytesRead > 0)
                {
                    // 处理客户端数据

                    // 继续异步接收客户端数据
                    client.GetStream().BeginRead(buffer, 0, buffer.Length, ReadCallback, state);
                }
                else
                {
                    // 客户端断开连接
                    IPAddress clientIP = ((IPEndPoint)client.Client.RemoteEndPoint).Address;

                    // 显示断开连接信息
                    LogMessage("Disconnected client IP: " + clientIP);

                    // 关闭客户端连接
                    client.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: " + ex.Message);
            }
        }

        private void LogMessage(string message)
        {
            if (InvokeRequired)
            {
                Invoke(new Action<string>(LogMessage), message);
            }
            else
            {
                listBoxLog.Items.Add(message);
            }
        }
    }
}

此代码创建一个简单的Windows窗体应用程序，使用TcpListener监听5900端口，并在连接和断开连接时显示IP地址。连接和断开连接的信息将显示在listBoxLog控件中。

请确保在窗体中正确设置了MainForm_Load事件处理程序和listBoxLog控件