using System;

using System.Reflection;

using System.Threading.Tasks;

​

namespace Sample

{

​

    class Sample

    {

        public static void AddNonPublicEventHandler(object eventObject, string eventName, Delegate handler)

        {

            var eventInfo = eventObject.GetType().GetEvent(eventName, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);

            //var addMethod = eventInfo?.GetAddMethod(true);

            //addMethod?.Invoke(eventObject, new object[] { handler });

            eventInfo.AddEventHandler(eventObject, handler);

        }

​

        public class EventClass

        {

            private event EventHandler MyPrivateEvent;

​

            public void TriggerEvent()

            {

                MyPrivateEvent?.Invoke(this, EventArgs.Empty);

            }

        }

​

​

        private static void MyEventHandler(object sender, EventArgs e)

        {

            Console.WriteLine("Event triggered");

        }

​

        public static void ExampleUsage()

        {

            var eventClassInstance = new EventClass();

​

            EventHandler handler = MyEventHandler;

​

            AddNonPublicEventHandler(eventClassInstance, "MyPrivateEvent", handler);

​

            eventClassInstance.TriggerEvent();

        }

​

        public static async Task Main()

        {

            ExampleUsage();

​

            Console.ReadKey();

        }

​

    }

}

​