Winform modbustcp 服务端编写

以下是一个简单的Winform Modbus TCP服务端的代码示例：

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

namespace ModbusTcpServer
{
    public partial class MainForm : Form
    {
        private TcpListener listener;
        private ModbusTcpServer modbusServer;

        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            listener = new TcpListener(IPAddress.Any, 502);
            modbusServer = new ModbusTcpServer();

            listener.Start();
            Task.Run(() => ListenForClients());
        }

        private async Task ListenForClients()
        {
            while (true)
            {
                var client = await listener.AcceptTcpClientAsync();
                Task.Run(() => HandleClient(client));
            }
        }

        private async Task HandleClient(TcpClient client)
        {
            try
            {
                var stream = client.GetStream();
                while (client.Connected)
                {
                    var request = await modbusServer.ReadRequest(stream);
                    var response = modbusServer.HandleRequest(request);
                    await modbusServer.WriteResponse(stream, response);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error handling client: " + ex.Message);
            }
            finally
            {
                client.Close();
            }
        }

        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            listener.Stop();
        }
    }
}

这个示例使用了`ModbusTcpServer`类来处理Modbus TCP请求和响应。`ListenForClients`方法负责接受客户端连接，并使用`HandleClient`方法来处理每个连接。在`HandleClient`方法中，我们读取请求、处理请求并写入响应。注意在`MainForm_FormClosing`事件中停止监听器。