Get Delegate from Event's Subscription

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Windows.Forms;

namespace DelegateFromSubscription
{
    public class Program
    {
        public static void Main( string[] args )
        {
            // Event publisher
            var toolStripButton = new ToolStripButton( );

            // We want to unsubsribe from this delegate
            toolStripButton.Click += delegate { MessageBox.Show( "I was found!" ); };

            // Search for the delegate and make sure that it's it
            var handler = (EventHandler) GetDelegate( toolStripButton, "EventClick" );
            handler.Invoke( null, null );

            // Unsubscribe from the delegate
            toolStripButton.Click -= handler;

            // What other event keys can we use
            PrintEventKeys( toolStripButton );
            Console.ReadLine( );
        }

        /// <summary>
        /// Prints all event keys of a control
        /// </summary>
        private static void PrintEventKeys( Component issuer )
        {
            Console.WriteLine( "Allowed event keys:" );
            foreach( var key in GetEventKeysList( issuer ) )
            {
                Console.WriteLine( "- " + key );
            }
        }

        /// <summary>
        /// Gets list of all event keys for a control
        /// </summary>
        private static IEnumerable<string> GetEventKeysList( Component issuer )
        {
            return
                from key in issuer.GetType( ).GetFields( BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy )
                where key.Name.StartsWith( "Event" )
                select key.Name;
        }

        /// <summary>
        /// Get delegate that listens an event of a component
        /// </summary>
        /// <param name="issuer">Component with an event</param>
        /// <param name="keyName">Key of event(<seealso cref="GetEventKeysList"/>)</param>
        /// <example>
        /// toolStripButton.Click += delegate { MessageBox.Show( "I was found!" ); };
        /// toolStripButton.Click -= (EventHandler) GetDelegate( toolStripButton, "EventClick" );
        /// </example>
        private static object GetDelegate( Component issuer, string keyName )
        {
            // Get key value for a Click Event
            // (key = internal static readonly object ToolStripItem.EventClick)
            var key = issuer
                .GetType( )
                .GetField( keyName, BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy )
                .GetValue( null );

            // Get events value to get access to subscribed delegates list
            // (events = protected EventHandlerList Component.events)
            var events = typeof( Component )
                .GetField( "events", BindingFlags.Instance | BindingFlags.NonPublic )
                .GetValue( issuer );

            // Find the Find method and use it to search up listEntry for corresponding key
            // (listEntry = Events.Find( key ))
            var listEntry = typeof( EventHandlerList )
                .GetMethod( "Find", BindingFlags.NonPublic | BindingFlags.Instance )
                .Invoke( events, new object[] { key } );

            // Get handler value from listEntry 
            // (handler = listEntry.handler )
            var handler = listEntry
                .GetType( )
                .GetField( "handler", BindingFlags.Instance | BindingFlags.NonPublic )
                .GetValue( listEntry );

            return handler;
        }
    }
}