（Socket.SendTo）如何响应/将数据发送回服务器开始接收的客户端？ C＃

Question

我正在使用UDP服务器，可以很好地接收数据，但是我不知道如何存储端点以将数据发送回去。

在SetupServer()的最后一行中的SetupServer()中，我不知道如何获取EndPoint 。

这是我的服务器代码：

static private byte[] buffer = new byte[1024];
    static private Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
    private const int port = 904;

    static void Main(string[] args) {
        SetupServer();
        Console.ReadLine();
    }
    static private void SetupServer() {
        Console.WriteLine($"{DateTime.Now}: Setting up server on {port}...");
        EndPoint remoteEP = new IPEndPoint(IPAddress.Any, port);
        serverSocket.Bind(remoteEP);
        Console.WriteLine($"{DateTime.Now}: Server created successfully");
        serverSocket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref remoteEP,BeginReceive, null);
        //serverSocket.SendTo(buffer, 0, buffer.Length, SocketFlags.None, remoteEP);
    }
    static private void BeginReceive(IAsyncResult ar) {
        int recv = serverSocket.EndReceive(ar);
        byte[] dataBuf = new byte[recv];
        Array.Copy(buffer, dataBuf, recv);
        Console.WriteLine($"{DateTime.Now}: {Encoding.ASCII.GetString(dataBuf)}");

        EndPoint remoteEP = new IPEndPoint(IPAddress.Any, port);
        serverSocket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref remoteEP, BeginReceive, null);
    }

Answer 1

我知道该怎么做。 我将BeginReceive方法中的serverSocket.EndReceive(ar)替换为EndReceiveFrom(ar,ref epSender)并使用该端点（epSender）可以调用BeginReceiveFrom方法。

    static private void SetupServer() {
    Console.WriteLine($"{DateTime.Now}: Setting up server on {port}...");
    EndPoint remoteEP = new IPEndPoint(IPAddress.Any, port);
    serverSocket.Bind(remoteEP);
    Console.WriteLine($"{DateTime.Now}: Server created successfully");
    serverSocket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref remoteEP,BeginReceive, serverSocket);
}
static private void BeginReceive(IAsyncResult ar) {
    EndPoint epSender = new IPEndPoint(IPAddress.Any, port);
    int recv = serverSocket.EndReceiveFrom(ar,epSender);
    byte[] dataBuf = new byte[recv];
    Array.Copy(buffer, dataBuf, recv);
    Console.WriteLine($"{DateTime.Now}: {Encoding.ASCII.GetString(dataBuf)}");

    serverSocket.SendTo(dataBuf,epSender)

    serverSocket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref remoteEP, BeginReceive, serverSocket);
}