从UDP连接获取客户端IP C＃

我目前有一个服务器应用程序正在侦听UDP数据包的端口。 当一个发送到服务器时，它会正确接收并处理它。 有什么方法可以获取数据包来自哪里的IP地址？

这是我创建套接字的方法

this.UDPListener = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, Port); this.UDPListener.Bind(endPoint); SocketAsyncEventArgs socketEventArgs = new SocketAsyncEventArgs(); socketEventArgs.SetBuffer(this.ReceiveBuffer, 0, this.ReceiveBuffer.Length); socketEventArgs.Completed += new EventHandler(OnReceive); if (!this.UDPListener.ReceiveAsync(socketEventArgs)) ThreadPool.QueueUserWorkItem(new WaitCallback((Object o) => this.OnReceive(this, socketEventArgs))); 

当调用OnReceive时，没有任何内容包含消息来自的ip。 我已经查看了SocketAsyncEventArgs，我看到的只是监听ip。

编辑：

这就是我最终做的事情。

 this.UDPListener = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); this.UDPListener.Bind(new IPEndPoint(IPAddress.Any, Port)); EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 0); this.UDPListener.BeginReceiveFrom(ReceiveBuffer, 0, ReceiveBuffer.Length, SocketFlags.None, ref remoteEndPoint, OnReceive, this.UDPListener); 

然后在OnReceiveinheritance人如何获取数据和信息

 //Get the received message. Socket receiveSocket = (Socket)AsyncResult.AsyncState; EndPoint clientEndPoint = new IPEndPoint(IPAddress.Any, 0); int udpMessageLength = receiveSocket.EndReceiveFrom(AsyncResult, ref clientEndPoint); byte[] udpMessage = new byte[udpMessageLength]; Array.Copy(ReceiveBuffer, udpMessage, udpMessageLength); //Start listening for a new message. EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, Int32.Parse(((IPEndPoint)receiveSocket.LocalEndPoint).Port.ToString())); this.UDPListener.BeginReceiveFrom(ReceiveBuffer, 0, ReceiveBuffer.Length, SocketFlags.None, ref remoteEndPoint, OnReceive, this.UDPListener); //Handle the received message Debug.WriteLine("Recieved {0} bytes from {1}:{2} to {3}:{4}", udpMessageLength, ((IPEndPoint)clientEndPoint).Address, ((IPEndPoint)clientEndPoint).Port, ((IPEndPoint)receiveSocket.LocalEndPoint).Address, ((IPEndPoint)receiveSocket.LocalEndPoint).Port); 

Answer 1

我不知道UdpClient ，但如果你直接使用Socket类，你可以调用.ReceiveFrom(byte[], ref EndPoint)方法，并通过第二个参数接收远程地址。

Answer 2

您需要检查参数中的ReceiveMessageFromPacketInfo字段。

  void OnReceive(object sender, SocketAsyncEventArgs e) { var info = e.ReceiveMessageFromPacketInfo; byte[] address = info.Address.GetAddressBytes(); } 

Answer 3

根据http://msdn.microsoft.com/en-us/library/system.net.sockets.socketasynceventargs.remoteendpoint.aspx，SocketAsyncEventArgs包含一个包含另一端的RemoteEndPoint属性。 那里有什么吗？