c# - C#udp广播包未收到

Question

我进入UDP并决定进行一次小型聊天，仅供练习。
我遇到了一个问题，我自己也无法解决。

我创建了两个完全相同的C#控制台程序(只是端口不同)

我发送了UDP广播程序包，然后希望在第二个控制台程序上接收它。发生的情况是，我发送广播的程序接收了该广播，而其他程序没有。反之亦然。

我已经关闭了防火墙->不会进行任何更改。

我将整个代码发布给您，希望你们能为我提供帮助，我真的很乐意继续前进!太感谢了!

class Program
{
    const int PORT = 10101;
    private static readonly UdpClient udpclient = new UdpClient(PORT);
    static void Main(string[] args)
    {
        Console.ForegroundColor = ConsoleColor.Red;
        udpclient.EnableBroadcast = true;
        //bool for calling async receiver just once
        bool receiving = false;
        Console.WriteLine("Chat 2");
        //to keep while loop running --> change later
        bool keepchatting = true;
        #region keepchating loop
        while (keepchatting)
        {
            if (!receiving)
            {
                startlistening();
            }
            receiving = true;
            newmessage();
        }
    }
    #endregion

    //new message --> call sendmessage to broadcast text via UDP
    public static void newmessage()
    {
        string msg;
        msg = Console.ReadLine();
        byte[] message = Encoding.ASCII.GetBytes(msg);
        sendmessage(message);
    }

    //Broadcast text via UDP
    public static void sendmessage(byte[] tosend)
    {
        UdpClient client = new UdpClient();
        client.EnableBroadcast = true;
        IPEndPoint ip = new IPEndPoint(IPAddress.Parse("255.255.255.255"), PORT);
        client.Send(tosend, tosend.Length, ip);
        client.Close();
        Console.WriteLine("Sent!");
    }

    static IAsyncResult ar = null;
    //Setup Async Receive Method 
    public static void startlistening()
    {
        ar = udpclient.BeginReceive(RecievedMessage, new object());
    }

    //Message
    public static void RecievedMessage(IAsyncResult ar)
    {
        IPEndPoint ip = new IPEndPoint(IPAddress.Any, PORT);
        byte[] bytes = udpclient.EndReceive(ar, ref ip);
        string msg = Encoding.ASCII.GetString(bytes);
        Console.WriteLine("Received: " + msg);
        startlistening();
    }

}

Answer 1

我只更改了您的代码的两部分，在每个客户端上设置另一个客户端的远程端口号，请尝试以下操作:

在一个客户端上:

const int PORT = 10101;
const int PORT_Remote = 10102;

IPEndPoint ip = new IPEndPoint(IPAddress.Parse("255.255.255.255"), PORT_Remote);

在另一个客户端上:

const int PORT = 10102;
const int PORT_Remote = 10101;

IPEndPoint ip = new IPEndPoint(IPAddress.Parse("255.255.255.255"), PORT_Remote);