关于组播地址

Question

在同一子网内，我在用组播，其他程序也在用组播，我怎么查询一个未用的组播地址呢？
比如：如果别人已经用224.224.224.224这个地址了，如果我也用的话，别人往这发数据不是也同时发给我的吗？
谢谢！

Answer 1

没做过 学习哦
简单组播实例：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Net.Sockets;
using System.Threading;namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            MultiCastServer server = new MultiCastServer();
            MultiCastClient client = new MultiCastClient();            Thread ClientThread = new Thread(new ThreadStart(client.ReceiveData));
            ClientThread.Start();            Thread ServerThread = new Thread(new ThreadStart(server.SendData));
            ServerThread.Start();        }
    }
    class MultiCastServer {
        private IPAddress multicastIP = IPAddress.Parse("224.110.10.1");
        private int port = 5001;
        public void SendData()
        {
            Console.WriteLine("Sender Start");
            IPEndPoint multicastIep = new IPEndPoint(multicastIP, port);
            UdpClient sendUdpClient = new UdpClient();            sendUdpClient.EnableBroadcast = true;            string sendString = "How   are   you";
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(sendString);            try
            {
                sendUdpClient.Send(bytes, bytes.Length, multicastIep);
            }
            catch
            {
                Console.WriteLine("send error");
            }
            finally
            {
                sendUdpClient.Close();
                Console.WriteLine("Sender Close");
            }
        }
    }    class MultiCastClient {        private IPAddress multicastIP = IPAddress.Parse("224.110.10.1");
        private int port = 5001;
        
        public void ReceiveData()
        {
            Console.WriteLine("Reciever Start");
            UdpClient receiveUdp = new UdpClient(this.port);
            try
            {
                receiveUdp.JoinMulticastGroup(this.multicastIP,10);
            }
            catch (SocketException e)
            {
                Console.WriteLine(e.Message.ToString());
            }            IPEndPoint remoteHost = null;            while (true)
            {
                try
                {
                    byte[] bytes = receiveUdp.Receive(ref remoteHost);
                    string str = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
                    Console.WriteLine(str);
                }
                catch
                {
                    Console.WriteLine("Reciever Close");
                    break;
                }
            }
        }
    
    }
}