gistfile1.txt

void Main()
{
	var testApplication = new TestApplication();
	
	var eventInfo = testApplication.GetType().GetEvents().First();
	
	EventHandlerPusher.AddEventHandler(testApplication, eventInfo, MyEventHandler);
	EventHandlerPusher.AddEventHandler(testApplication, eventInfo, MyEventHandler);
	
	testApplication.FireEvent();
}

class EventHandlerPusher
{
	private static readonly IDictionary<Type, MethodInfo> _cachedWrappers = new Dictionary<Type, MethodInfo>();
	
	public static void AddEventHandler(object instance, EventInfo eventInfo, EventHandler<EventArgs> eventHandler)
	{
		MethodInfo wrap;
		var eventType = eventInfo.EventHandlerType.GenericTypeArguments.First();
		
		if (!_cachedWrappers.TryGetValue(eventType, out wrap))
		{
			wrap = typeof(EventHandlerPusher).GetMethod("Wrap", BindingFlags.Static | BindingFlags.NonPublic)
				.MakeGenericMethod(eventType);
				
			_cachedWrappers.Add(eventType, wrap);
		}
		
		wrap.Invoke(null, new object[] { instance, eventInfo, eventHandler });
	}
	
	private static void Wrap<T>(object instance, EventInfo eventInfo, EventHandler<EventArgs> eventHandler)
		where T : EventArgs
	{
		var wrapper = new EventHandler<T>((sender, e) => { eventHandler(sender, e); });
		
		eventInfo.AddEventHandler(instance, wrapper);
	}
}

void MyEventHandler(object sender, EventArgs e)
{
	Console.WriteLine("Event fired!");
}

class TestApplication
{
	public event EventHandler<MyEventArgs> SomeEvent;
	
	public void FireEvent()
	{
		if (SomeEvent != null)
		{
			SomeEvent(this, new MyEventArgs());
		}
	}
}

class MyEventArgs : EventArgs
{
}