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ممنون میشم سریع تر جواب بدین

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public class Client
{
    public static void Main()
    {
        ApplicationMediator mediator = new ApplicationMediator();
        ConcreteColleague desktop = new ConcreteColleague(mediator);
        MobileColleague mobile = new MobileColleague(mediator);
        mediator.addColleague(desktop,"groupA");
        mediator.addColleague(mobile, "groupB");
        desktop.send("Hello World", "groupA");
        mobile.send("Hello", "groupB");

        Console.ReadKey();
    }
}


public interface Mediator
{
    void send(String message, Colleague colleague,String groupName);

}

public abstract class Colleague
{
    private Mediator mediator;
    public Colleague(Mediator m)
    {
        mediator = m;
    }
    //send a message via the mediator
    public void send(String message,string groupName)
    {
        mediator.send(message, this, groupName);
    }
    //get access to the mediator
    public Mediator getMediator()
    {
        return mediator;
    }
    public abstract void receive(String message);
}



public class ApplicationMediator : Mediator
{
    private List<Colleague> colleagues;
    private Dictionary<string, List<Colleague>> dictionary;
    public ApplicationMediator()
    {
        // colleagues = new List<Colleague>();
        dictionary = new Dictionary<string, List<Colleague>>();
    }
    public void addColleague(Colleague colleague,string groupName)
    {

        //colleagues.Add(colleague);
        if (!dictionary.ContainsKey(groupName))
        {
            dictionary.Add(groupName, new List<Colleague>());
        }
        dictionary[groupName].Add(colleague);

    }
    public void send(String message, Colleague originator,String groupName)
    {
        
        //let all other screens know that this screen has changed
        foreach (var colleague in dictionary[groupName])
        {
            //don't tell ourselves
            if (colleague != originator)
                colleague.receive(message);
        }
    }
}

public class ConcreteColleague : Colleague
{
    public ConcreteColleague(Mediator m) : base(m) { }
    public override void receive(String message)
    {
        Console.WriteLine("Colleague Received: " + message);
    }
}
public class MobileColleague : Colleague
{

    public MobileColleague(Mediator m) : base(m) { }
    public override void receive(String message)
    {
        Console.WriteLine("Mobile Received: " + message);
    }
}

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