Observable.cs

using System;
using System.Collections.Generic;
 
namespace be.gaudry.observer
{
    /// <summary>
    /// Provides methods to add or remove observers and notify them
    /// </summary>
    [Serializable]
    public class Observable : IObservable
    {
        private List<IObserver> observers = new List<IObserver>();
 
        #region IObservable Members
 
        /// <summary>
        /// Send a notification to all registerd obervers
        /// </summary>
        /// <param name="notification">notification to send</param>
        public void notify(Notification notification)
        {
            try
            {
                foreach (IObserver observer in observers)
                {
                    try
                    {
                        observer.update(notification);
                    }
                    catch (Exception) { }
                }
            }
            catch (InvalidOperationException) { }
        }
 
        /// <summary>
        /// Add (register) an observer
        /// </summary>
        /// <param name="o">observer to add</param>
        public void addObserver(IObserver o)
        {
            if(!observers.Contains(o)) observers.Add(o);
        }
 
        /// <summary>
        /// Remove an observer
        /// </summary>
        /// <param name="o">observer to remove</param>
        public void removeObserver(IObserver o)
        {
            observers.Remove(o);
        }
 
        #endregion
    }
}