System.Net.Sockets.Tests.DualModeConnectionlessReceiveMessageFrom.ReceiveMessageFrom_Helper C# (CSharp) Метод

        private void ReceiveMessageFrom_Helper(IPAddress listenOn, IPAddress connectTo, bool expectedToTimeout = false)
        {
            using (Socket serverSocket = new Socket(SocketType.Dgram, ProtocolType.Udp))
            {
                int port = serverSocket.BindToAnonymousPort(listenOn);

                EndPoint receivedFrom = new IPEndPoint(connectTo, port);
                SocketFlags socketFlags = SocketFlags.None;
                IPPacketInformation ipPacketInformation;
                int received = 0;

                serverSocket.ReceiveTimeout = TestSettings.FailingTestTimeout;

                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    Assert.Throws<SocketException>(() =>
                    {
                        // This is a false start.
                        // http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.receivemessagefrom.aspx
                        // "...the returned IPPacketInformation object will only be valid for packets which arrive at the
                        // local computer after the socket option has been set. If a socket is sent packets between when
                        // it is bound to a local endpoint (explicitly by the Bind method or implicitly by one of the Connect,
                        // ConnectAsync, SendTo, or SendToAsync methods) and its first call to the ReceiveMessageFrom method,
                        // calls to ReceiveMessageFrom method will return invalid IPPacketInformation objects for these packets."
                        received = serverSocket.ReceiveMessageFrom(new byte[1], 0, 1, ref socketFlags, ref receivedFrom, out ipPacketInformation);
                    });
                }
                else
                {
                    // *nix may throw either a SocketException or ArgumentException in this case, depending on how the IP stack
                    // behaves w.r.t. dual-mode sockets bound to IPv6-specific addresses.
                    Assert.ThrowsAny<Exception>(() =>
                    {
                        received = serverSocket.ReceiveMessageFrom(new byte[1], 0, 1, ref socketFlags, ref receivedFrom, out ipPacketInformation);
                    });
                }

                serverSocket.ReceiveTimeout = expectedToTimeout ? TestSettings.FailingTestTimeout : TestSettings.PassingTestTimeout;

                SocketUdpClient client = new SocketUdpClient(_log, serverSocket, connectTo, port);

                receivedFrom = new IPEndPoint(connectTo, port);
                socketFlags = SocketFlags.None;
                received = serverSocket.ReceiveMessageFrom(new byte[1], 0, 1, ref socketFlags, ref receivedFrom, out ipPacketInformation);

                Assert.Equal(1, received);
                Assert.Equal<Type>(receivedFrom.GetType(), typeof(IPEndPoint));

                IPEndPoint remoteEndPoint = receivedFrom as IPEndPoint;
                Assert.Equal(AddressFamily.InterNetworkV6, remoteEndPoint.AddressFamily);
                Assert.Equal(connectTo.MapToIPv6(), remoteEndPoint.Address);

                Assert.Equal(SocketFlags.None, socketFlags);
                Assert.NotNull(ipPacketInformation);

                Assert.Equal(connectTo, ipPacketInformation.Address);
            }
        }