C＃UdpClient.Receive（）不能與多播一起使用，無論我做什么

Question

試圖過去解決這個問題，我什至不知道，但是沒有谷歌搜索可以幫到我，我對此需要一些建議。 我每10秒從本地網絡上的另一台PC接收UDP數據包，可以在Wireshark中看到它們，但是應用程序卡在udpClient.Receive（）行上。 多播組和端口是正確的值，在main（）中檢入n + 1次。 如果您有任何幫助的想法，請提出解決方案。 謝謝。

（我正在嘗試接收服務器的信息，以便應用程序可以自動開始通過TCP與之進行通信）

class MulticastListener {

    private UdpClient udpClient;
    private IPEndPoint remoteEndPoint;
    IPAddress multicastIP;
    private int port;

    public MulticastListener(ref IPAddress multicastIP, int port) {
        remoteEndPoint = new IPEndPoint(IPAddress.Any, port);

        this.multicastIP = multicastIP;
        this.port = port;
        udpClient = new UdpClient();
        udpClient.Client.Bind(remoteEndPoint);

    }

    public IPEndPoint GetServer() {

        try {
            udpClient.JoinMulticastGroup(multicastIP);
        } catch (ObjectDisposedException e) {
            Console.WriteLine("ERROR: The underlying socket has been closed!");
        } catch (SocketException e) {
            Console.WriteLine("ERROR: An error occurred when accessing the socket!");
        } catch (ArgumentException e) {
            Console.WriteLine("ERROR: The IP address is not compatible with the AddressFamily value that defines the addressing scheme of the socket!");
        }

        Byte[] serverInfoBytes = udpClient.Receive(ref remoteEndPoint);

        Stream stream = new MemoryStream(serverInfoBytes); //receives a serialised IPEndpoint object
        BinaryFormatter formatter = new BinaryFormatter();
        udpClient.Close();
        return (IPEndPoint)formatter.Deserialize(stream);
    }
}

Answer 1

正如我評論的那樣，您的代碼對我來說100％正常。 我會檢查您是否在接收的同一子網中進行發送。 也許您的發件人未配置正確的界面？

嘗試使用其他發件人可能會有所幫助，這是我以前測試的內容：

    static void Main(string[] args)
    {
        //Configuration
        var interfaceIp = IPAddress.Parse("192.168.9.121");
        var interfaceEndPoint = new IPEndPoint(interfaceIp, 60001);
        var multicastIp = IPAddress.Parse("230.230.230.230");
        var multicastEndPoint = new IPEndPoint(multicastIp, 60001);

        //initialize the socket
        var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        socket.ExclusiveAddressUse = false;
        socket.MulticastLoopback = false;
        socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
        MulticastOption option = new MulticastOption(multicastEndPoint.Address, interfaceIp);
        socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, option);

        //bind on a network interface
        socket.Bind(interfaceEndPoint);

        //initialize args for sending packet on the multicast channel
        var sockArgs = new SocketAsyncEventArgs();
        sockArgs.RemoteEndPoint = multicastEndPoint;
        sockArgs.SetBuffer(new byte[1234], 0, 1234);

        //send an empty packet of size 1234 every 3 seconds
        while (true)
        {
            socket.SendToAsync(sockArgs);
            Thread.Sleep(3000);
        }
    }