Solution to reto 2 MSDN http://blogs.msdn.com/b/esmsdn/archive/2014/09/19/retosmsdn-reto-2-161-esos-eventos.aspx

Reto.cs

// Leo Antoli solution to reto 2 MSDN: http://blogs.msdn.com/b/esmsdn/archive/2014/09/19/retosmsdn-reto-2-161-esos-eventos.aspx

using System;
using System.Linq;

namespace Reto2ClassLibrary
{
    public class Reto2 : IReto2
    {
        public event EventHandler EventFired;
        
        public void FireEvent() { 
            if (EventFired != null) {
                foreach (var evt in EventFired.GetInvocationList().
                        Where(x => x.Target is Item).
                        OrderBy(x => (x.Target as Item).Index)) {
                    evt.DynamicInvoke(this, null);
                }
            }
        }
    }
}