System.Net.Sockets.Tests.SocketOptionNameTest.MulticastInterface_Set_Helper C# (CSharp) Метод

        private async Task MulticastInterface_Set_Helper(int interfaceIndex)
        {
            IPAddress multicastAddress = IPAddress.Parse("239.1.2.3");
            string message = "hello";
            int port;

            using (Socket receiveSocket = CreateBoundUdpSocket(out port),
                          sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
            {
                receiveSocket.ReceiveTimeout = 1000;
                receiveSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(multicastAddress, interfaceIndex));

                // https://github.com/Microsoft/BashOnWindows/issues/990
                if (!PlatformDetection.IsWindowsSubsystemForLinux)
                {
                    sendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, IPAddress.HostToNetworkOrder(interfaceIndex));
                }

                var receiveBuffer = new byte[1024];
                var receiveTask = receiveSocket.ReceiveAsync(new ArraySegment<byte>(receiveBuffer), SocketFlags.None);

                for (int i = 0; i < TestSettings.UDPRedundancy; i++)
                {
                    sendSocket.SendTo(Encoding.UTF8.GetBytes(message), new IPEndPoint(multicastAddress, port));
                }

                int bytesReceived = await receiveTask;
                string receivedMessage = Encoding.UTF8.GetString(receiveBuffer, 0, bytesReceived);

                Assert.Equal(receivedMessage, message);
            }
        }