TcpListener接收和发送消息的问题

Question

class Program
    {
        static void Main(string[] args)
        {            try
            {//创建服务端
                TcpListener tcpListener = new TcpListener(System.Net.IPAddress.Parse("127.0.0.1"), 8686);
                tcpListener.Start();
                while (true)
                {
                    TcpClient client = tcpListener.AcceptTcpClient();
                    StreamReader sr = new StreamReader(client.GetStream());
                    NetworkStream ns = client.GetStream();
                    StreamWriter sw = new StreamWriter(ns);
                    sw.Write("I hava receive");          
                    Console.WriteLine(sr.ReadLine());   
                    sw.Flush();
                }
            }
            catch (Exception e){
                //创建客户端
                TcpClient tcpClinet = new TcpClient(); 
               while (true)
                {
                    tcpClinet.Connect("127.0.0.1", 8686);
                    StreamReader sr = new StreamReader(tcpClinet.GetStream());
                    NetworkStream ns = tcpClinet.GetStream();
                    StreamWriter sw = new StreamWriter(ns);         
                        sw.Write(Console.ReadLine());
                        sw.Flush();
                        if (sr.ReadLine().Length != 0)
                        {
                            Console.WriteLine(sr.ReadLine());
                        }                    ns.Close();
                }
            }
        }
    }
大神们帮我看一下这个程序为什么服务端只能接收客户消息,却不能发送消息

Answer 1

 tcpClinet.Connect("127.0.0.1", 8686);
这句不能写在循环里，客户端每次循环都去创建一个新连接当然就收不到服务端返回的消息了

Answer 2

但是写到外面 NetworkStream ns = tcpClinet.GetStream();会报不允许对非连接的套接字执行此操作。

Answer 3

NetworkStream ns = tcpClinet.GetStream();也写外边