[ServiceContract(Namespace = "http://xx.com", CallbackContract = typeof(Ipub_c))]    public interface Ipub_s    {        [OperationContract(IsOneWay = true)]        void toserver(string cs);    }    public interface Ipub_c    {        [OperationContract(IsOneWay = true)]        void toclient(string cs);    } [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Reentrant)]    public class Bpub : Ipub_s    {        public void toserver(string cs)        {            Ipub_c callback = OperationContext.Current.GetCallbackChannel
     
      ();            for (int i = 0; i < 1000; i++)            {                System.Threading.Thread.Sleep(1000);                callback.toclient(cs + " | " + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss fff") + " | " + cs);            }        }    } ServiceHost host = new ServiceHost(typeof(Bpub));                host.AddServiceEndpoint(typeof(Ipub_s), new NetTcpBinding(), "net.tcp://localhost/dd");                host.Opened += (s, ek) =>                {                    this.Invoke((Action)delegate                    {                        button1.Enabled = false;                        button1.Text = "已启动";                        Console.WriteLine("HelloService已经启动，按按回车键终止服务！");                    });                };                host.Open();     InstanceContext instanceContext = new InstanceContext(new Bcpub());            DuplexChannelFactory
      
        channel = new DuplexChannelFactory
       
        (instanceContext, new NetTcpBinding(), "net.tcp://localhost/dd");            Ipub_s proxy = channel.CreateChannel();            proxy.toserver("dddds");