System.Net.Sockets.Tests.NetworkStreamTest.RunWithConnectedNetworkStreamsAsync C# (CSharp) Method

        private static async Task RunWithConnectedNetworkStreamsAsync(Func<NetworkStream, NetworkStream, Task> func)
        {
            var listener = new TcpListener(IPAddress.Loopback, 0);
            try
            {
                listener.Start(1);
                var clientEndpoint = (IPEndPoint)listener.LocalEndpoint;

                using (var client = new TcpClient(clientEndpoint.AddressFamily))
                {
                    Task<TcpClient> remoteTask = listener.AcceptTcpClientAsync();
                    Task clientConnectTask = client.ConnectAsync(clientEndpoint.Address, clientEndpoint.Port);

                    await Task.WhenAll(remoteTask, clientConnectTask);

                    using (TcpClient remote = remoteTask.Result)
                    using (NetworkStream serverStream = remote.GetStream())
                    using (NetworkStream clientStream = client.GetStream())
                    {
                        await func(serverStream, clientStream);
                    }
                }
            }
            finally
            {
                listener.Stop();
            }
        }