UdpClient 作为客户端连接服务器

Question

UdpClient 作为客户端连接服务器时，我是用connect连接到指定的ip、port的时候，如果不向服务器发送数据，服务器下发数据的时候我收不到，为什么？
下面是代码，我是反复进行read的，不向服务器发数据，就收不到，请大虾们指点了。
  public bool read()
        {
            RecBuf = new byte[1024];
            UdpState udpState = new UdpState();
            udpState.MyudpClient = udpClient;
            IAsyncResult ar = udpClient.BeginReceive(UdpReceiveCallback, udpState);
            while (!ar.IsCompleted)
            {
                Thread.Sleep(100);
            }
            return true;
        }        private void UdpReceiveCallback(IAsyncResult ar)
        {
            UdpClient d = (UdpClient)((UdpState)(ar.AsyncState)).MyudpClient;
            IPEndPoint remote = (IPEndPoint)((UdpState)(ar.AsyncState)).IpEndPoint;
            RecBuf = d.EndReceive(ar, ref remote);
            RecBufNum = RecBuf.Length;
        }  

Answer 1

你把代码贴全，是不是udpClient的初始化那部分的问题，或者循环Read 部分也贴出来看看

Answer 2

        UdpClient udpClient;
        public UClient()
        {
            udpClient = new UdpClient();
        }        public bool Open()
        {
            try
            {
                udpClient.Connect(this.Ip, this.Port);
            }
            catch (Exception)
            {
                return false;
            }
            IsOnline = true;
            return true;
        }这是初始化部分，他们写在一个类里面，链接的地址使用的是TCP UDP Socke调试工具，在本机端口调试的

Answer 3

while (true)
            {
                try
                {
                    if (Tcli.IsOnline)
                    {
                        if (Tcli.read())
                        {
                            ProcRead = Tcli.RecBuf;
                            ProcReadNum = Tcli.RecBufNum;
                            thisEventSocketLog(ProcReadNum.ToString());
                        }
                    }
                    else if (Ucli.IsOnline)
                    {
                        if (Ucli.read())
                        {
                            ProcRead = Ucli.RecBuf;
                            ProcReadNum = Ucli.RecBufNum;
                            thisEventSocketLog(ProcReadNum.ToString());
                        }
                    }
                }
我这是一个线程，线程是个read的死循环，怎么会就一次呢。而且我断点看了，他就是没收到。