static void TcpListenerTest()
    {
        Console.WriteLine("TcpListener Server");
        var tcpListener = new TcpListener(IPAddress.Parse("127.0.0.1"), 9090);
        tcpListener.Start();
        Console.WriteLine("TcpListener Start");
        var task = Task.Run(() =>
        {
            while (true)
            {
                var tcpClient = tcpListener.AcceptTcpClient();
                var buffer = new byte[tcpClient.ReceiveBufferSize];
                var stream = tcpClient.GetStream();
                stream.Read(buffer, 0, buffer.Length);
                stream.Close();
                tcpClient.Close();
                var receivedMsg = string.Empty;
                receivedMsg += Encoding.UTF8.GetString(buffer).Trim('\0');
                Console.WriteLine("收到消息:" + receivedMsg);
 
                // 服務端心跳間隔
                Thread.Sleep(1000);
            }
        });
 
        Console.ReadLine();
    }

    static void TcpClientTest()
    {
        Console.WriteLine("TcpClient");
 
        var msg = "這是來自客戶端的消息111";
        var client = new TcpClient("127.0.0.1", 9090);
        var sendStream = client.GetStream();
        var sendBytes = Encoding.Default.GetBytes(msg);
        sendStream.Write(sendBytes, 0, sendBytes.Length);
        sendStream.Flush();
        sendStream.Close();//關閉網(wǎng)絡流  
        client.Close();//關閉客戶端  
 
        Console.WriteLine(msg);
 
        Console.ReadLine();
    }