Using Reflection to Manage Event Handlers

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace TestEvent
{
	class Program
	{
		static void Main( string[] args )
		{
			MyClass c = new MyClass();

			EventInfo eInfo = null;
			foreach( EventInfo e in c.GetType().GetEvents() )
			{
				foreach( object o in e.GetCustomAttributes( true ) )
				{
					if( o is PubEventAttribute )
					{
						eInfo = e;
						ParameterInfo[] actionArgs = eInfo.EventHandlerType.GetMethod( "Invoke" ).GetParameters();
						if( actionArgs.Length == 1 )
						{
							// create the ActionPublisher instance that matches our event
							Type publisherType = typeof( ActionPublisher<> ).MakeGenericType( new Type[] { actionArgs[ 0 ].ParameterType } );
							object publisher = Activator.CreateInstance( publisherType, c, "/Topic" );

							// create a delegate to the PublishAction method of the publisher
							MethodInfo publisherInvoke = publisherType.GetMethod( "PublishAction" );
							Delegate d = Delegate.CreateDelegate( eInfo.EventHandlerType, publisher, publisherInvoke );

							// wire up the delegate to the event
							eInfo.AddEventHandler( c, d );
							break;
						}
					}
				}
			}

			c.DoIt();
			Console.ReadLine();
		}

		public static void HandleEvent( params object[] args )
		{
			Console.Write( "Publish: ( " );

			bool first = true;
			foreach( object o in args )
			{
				Console.Write( (first ? "" : ", ") + o.ToString() );
				first = false;
			}
			Console.WriteLine( " )" );
		}

	}

	public class ActionPublisher<T>
	{
		public ActionPublisher( object sender, string topic )
		{
			_sender = sender;
			_topic = topic;
		}
		private object _sender;
		private string _topic;

		public void PublishAction( T t )
		{
			Program.HandleEvent( new object[] { t } );
		}
	}

	public class PubEventAttribute : Attribute
	{
	}

	public class MyClass
	{
		private Random _random = new Random();

		// DoIt fires our event
		public void DoIt()
		{
			if( Event1 != null )
				Event1( _random.Next() );
		}

		[PubEvent]
		public event Action<int> Event1;

	}
}