UdpClient在同一端口上异步发送和接收

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        UdpClient udpClient = new UdpClient(5000);

        // 异步接收数据
        udpClient.BeginReceive(async (result) =>
        {
            IPEndPoint remoteEndPoint = (IPEndPoint)result.RemoteEndPoint;
            byte[] receivedData = udpClient.EndReceive(result, ref remoteEndPoint);
            string receivedMessage = Encoding.ASCII.GetString(receivedData);
            Console.WriteLine($"Received: {receivedMessage} from {remoteEndPoint}");

            // 异步发送响应
            string responseMessage = "Hello from server!";
            byte[] responseData = Encoding.ASCII.GetBytes(responseMessage);
            await udpClient.SendAsync(responseData, responseData.Length, remoteEndPoint);
        }, null);

        // 异步发送数据
        IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 5000);
        string message = "Hello from client!";
        byte[] data = Encoding.ASCII.GetBytes(message);
        await udpClient.SendAsync(data, data.Length, endPoint);

        Console.WriteLine("Press any key to exit...");
        Console.ReadKey();
        udpClient.Close();
    }
}