Как получить все обработчики события из EventInfo?

Класс для получения списка делегатов для обычных классов (не наследников от класса Component

using System;
using System.Linq;
using System.Reflection;
namespace WindowsFormsApp1
{
    public static class ReflectionHelper
    {
        public static Delegate[] GetSubscribedMethods(object instance, string eventName)
        {
            var type = instance.GetType();
            var currentEvent = type.GetEvents().FirstOrDefault(ev => ev.Name == eventName);
            if (currentEvent != null)
            {
                var eventFieldInfo = type.GetField(eventName,
                    BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.GetField);
                if (eventFieldInfo != null)
                {
                    var eventFieldValue = (Delegate)eventFieldInfo.GetValue(instance);
                    return eventFieldValue.GetInvocationList();
                }
            }
            return new Delegate[0];
        }
    }
}

И код с демонстрацией работы

using System;
using System.Windows.Forms;
namespace WindowsFormsApp1
{
    public partial class MainForm : Form
    {
        private readonly Worker _worker;
        public MainForm()
        {
            InitializeComponent();
            Load += OnMainFormLoad;
            _worker = new Worker();
            _worker.SomeEvent1 += OnWorkerSomeEvent11;
            _worker.SomeEvent1 += OnWorkerSomeEvent12;
            _worker.SomeEvent2 += OnWorkerSomeEvent22;
        }
        private void OnWorkerSomeEvent11(object sender, EventArgs e)
        {
        }
        private void OnWorkerSomeEvent12(object sender, EventArgs e)
        {
        }
        private void OnWorkerSomeEvent22(object sender, EventArgs e)
        {
        }
        private void OnMainFormLoad(object sender, EventArgs e)
        {
            var clickEventHandlers = ReflectionHelper.GetSubscribedMethods(
                _worker, nameof(Worker.SomeEvent1));
            var lostFocusEventHandlers = ReflectionHelper.GetSubscribedMethods(
                _worker, nameof(Worker.SomeEvent2));
        }
    }
    public class Worker
    {
        public event EventHandler SomeEvent1;
        public event EventHandler SomeEvent2;
        public void DoWork()
        {
            SomeEvent1?.Invoke(this, EventArgs.Empty);
            SomeEvent2?.Invoke(this, EventArgs.Empty);
        }
    }
}

На примере Windows Forms приложения и кнопки

using System;
using System.ComponentModel;
using System.Reflection;
using System.Windows.Forms;
namespace WindowsFormsApp1
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
            Load += OnMainFormLoad;
            execButton.Click += OnButtonClick1;
            execButton.Click += OnButtonClick2;
            execButton.LostFocus += OButtonLostFocus;
        }
        private static Delegate[] GetInvocationListOfEvent(Control control, string eventName)
        {
            FieldInfo fieldInfo = typeof(Control).GetField(
                "Event" + eventName, BindingFlags.Static | BindingFlags.NonPublic);
            if (fieldInfo != null)
            {
                PropertyInfo pi = control.GetType().GetProperty("Events",
                    BindingFlags.NonPublic | BindingFlags.Instance);
                if (pi != null)
                {
                    var list = (EventHandlerList)pi.GetValue(control, null);
                    object obj = fieldInfo.GetValue(control);
                    return list[obj].GetInvocationList();
                }
            }
            return new Delegate[0];
        }
        private void OnMainFormLoad(object sender, EventArgs e)
        {
            var clickEventHandlers = GetInvocationListOfEvent(
                execButton, nameof(Control.Click));
            var lostFocusEventHandlers = GetInvocationListOfEvent(
                execButton, nameof(Control.LostFocus));
        }
        private void OButtonLostFocus(object sender, EventArgs e)
        {
        }
        private void OnButtonClick1(object sender, EventArgs e)
        {
        }
        private void OnButtonClick2(object sender, EventArgs e)
        {
        }
    }
}