מריה בוטוסוב

יש לממש observable design pattern

public interface IObserver {
    void Update(ISubject subject);
}
 
public interface ISubject {
    void Attach(IObserver observer);
    void Detach(IObserver observer);
    void Notify();
}
 
public class Subject:Isubject {
    public int State {get;set;}
    private List<IObserver> _observers = new List<IObserver>();
    
    public void Attach(IObserver observer) {
        this._observers.Add(observer);
    }
    
    public void Detach(IObserver observer) {
        this._observers.Remove(observer);
    }
    
    public void Notify() {
        foreach(var observer in _observers) {
            observer.Update(this);
        }
    }
    
    public void SomeBusinessLogic() {
        this.State = new Random().Next(0,10);
        Thread.Sleep(15);
        this.Notify();
    }
}