using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.Serialization;

using System.ServiceModel;

using System.Text;



namespace CoreDll

{

    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.

    [ServiceContract(SessionMode = SessionMode.Required, CallbackContract = typeof(IQQSback))]

    public interface IQQS

    {

        [OperationContract(IsOneWay = true, IsInitiating = true, IsTerminating = false)]

        void Speak(string value);



        [OperationContract(IsOneWay = true, IsInitiating = true, IsTerminating = false)]

        void Whisper(string name, string value);



        [OperationContract(IsOneWay = true, IsInitiating = true, IsTerminating = false)]

        void Leave();



        [OperationContract(IsOneWay = false, IsInitiating = true, IsTerminating = false)]

        List<string> join(string value);



    }



    interface IQQSback

    {

        [OperationContract(IsOneWay = true)]

        void Receive(string senderName, string message);



        [OperationContract(IsOneWay = true)]

        void ReceiveWhisper(string senderName, string message);



        [OperationContract(IsOneWay = true)]

        void UserEnter(List<string> name);



        [OperationContract(IsOneWay = true)]

        void UserLeave(string name);

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.Serialization;

using System.ServiceModel;

using System.Text;



namespace CoreDll

{

    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Multiple)]

    public class Service1 : IQQS

    {

        IQQSback QQback = OperationContext.Current.GetCallbackChannel<IQQSback>();

        delegate void userenter(List<string> username);

        static event userenter&n