用 C# 程序包 NModbus 写一个 modbus tcp server的例子并给地址1赋值

以下是使用C#程序包NModbus编写Modbus TCP Server的示例代码，并在地址1处赋值：

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using NModbus;

class Program
{
    static void Main(string[] args)
    {
        // 创建Modbus TCP Server
        TcpListener listener = new TcpListener(IPAddress.Any, 502);
        listener.Start();

        Console.WriteLine("Modbus TCP Server started...");

        try
        {
            using (IModbusDataStore dataStore = DataStoreFactory.CreateDefaultDataStore())
            using (ModbusTcpSlave slave = new ModbusTcpSlave(dataStore))
            {
                slave.ListenBacklog = 10;
                slave.Start();

                Console.WriteLine("Modbus TCP Slave started...");

                // 设置地址1的值为100
                dataStore.HoldingRegisters[0] = 100;

                Console.WriteLine("Address 1 value set to 100");

                while (true)
                {
                    TcpClient client = listener.AcceptTcpClient();
                    Thread thread = new Thread(HandleClient);
                    thread.Start(client);
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception: " + ex.Message);
        }
        finally
        {
            listener.Stop();
        }
    }

    static void HandleClient(object obj)
    {
        TcpClient client = (TcpClient)obj;
        ModbusTcpSlave slave = null;

        try
        {
            slave = new ModbusTcpSlave(new EmptyDataStore());
            slave.ListenBacklog = 1;
            slave.ModbusSlaveRequestReceived += Slave_ModbusSlaveRequestReceived;
            slave.DataStore = DataStoreFactory.CreateDefaultDataStore();
            slave.ModbusSlaveRequestReceived += Slave_ModbusSlaveRequestReceived;
            slave.Listen(client.GetStream());
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception: " + ex.Message);
        }
        finally
        {
            if (slave != null)
            {
                slave.ModbusSlaveRequestReceived -= Slave_ModbusSlaveRequestReceived;
                slave.Dispose();
            }
            client.Close();
        }
    }

    static void Slave_ModbusSlaveRequestReceived(object sender, ModbusSlaveRequestEventArgs e)
    {
        Console.WriteLine("Modbus request received: " + e.Message.FunctionCode);
    }
}

上述代码创建了一个Modbus TCP Server，监听端口502，并设置地址1的值为100。在HandleClient方法中，可以处理来自客户端的Modbus请求。在Slave_ModbusSlaveRequestReceived事件处理程序中，可以处理不同的Modbus功能码。

请注意，上述示例代码仅用于演示目的，并需要根据实际需求进行修改和完善