System.Net.Sockets.Tests.TcpClientTest.ConnectAsync_DnsEndPoint_Success C# (CSharp) Метод

        public async Task ConnectAsync_DnsEndPoint_Success(int mode)
        {
            using (TcpClient client = new TcpClient())
            {
                Assert.False(client.Connected);

                string host = System.Net.Test.Common.Configuration.Sockets.SocketServer.IdnHost;
                int port = System.Net.Test.Common.Configuration.Sockets.SocketServer.Port;

                IPAddress[] addresses;
                switch (mode)
                {
                    case 0:
                        await client.ConnectAsync(host, port);
                        break;
                    case 1:
                        addresses = await Dns.GetHostAddressesAsync(host);
                        await client.ConnectAsync(addresses[0], port);
                        break;
                    case 2:
                        addresses = await Dns.GetHostAddressesAsync(host);
                        await client.ConnectAsync(addresses, port);
                        break;

                    case 3:
                        await Task.Factory.FromAsync(client.BeginConnect, client.EndConnect, host, port, null);
                        break;
                    case 4:
                        addresses = await Dns.GetHostAddressesAsync(host);
                        await Task.Factory.FromAsync(client.BeginConnect, client.EndConnect, addresses[0], port, null);
                        break;
                    case 5:
                        addresses = await Dns.GetHostAddressesAsync(host);
                        await Task.Factory.FromAsync(client.BeginConnect, client.EndConnect, addresses, port, null);
                        break;
                }

                Assert.True(client.Connected);
                Assert.NotNull(client.Client);
                Assert.Same(client.Client, client.Client);

                using (NetworkStream s = client.GetStream())
                {
                    byte[] getRequest = Encoding.ASCII.GetBytes("GET / HTTP/1.1\r\n\r\n");
                    await s.WriteAsync(getRequest, 0, getRequest.Length);
                    Assert.NotEqual(-1, s.ReadByte()); // just verify we successfully get any data back
                }
            }
        }