using System;

namespace InvokeApp

{

    class Item

    {

        public int stockInhand=5;

        class HasEvent

        {

            public event EventHandler OnEnvent;

            EventInvoker Order;

​

            public HasEvent()

            {

                Order = new EventInvoker(this, () => OnEnvent);

            }

​

            public void MyInvokerRaising() {

                Order.Raise();

            }

​

        }

​

        class EventInvoker

        {

            private Func<EventHandler> GetEventHandler;

            private object sender;

​

            public EventInvoker(object sender, Func<EventHandler> GetEventHandler)

            {

                this.sender = sender;

                this.GetEventHandler = GetEventHandler;

            }

​

            public void Raise()

            {

                if(null != GetEventHandler())

                {

                    GetEventHandler()(sender, new EventArgs());

                }

            }

        }

​

        static void Main(string[] args)

        {

            HasEvent h = new HasEvent();

            h.OnEnvent += Refill_OnEnvent;

            h.MyInvokerRaising();

        }

​

        private static void Refill_OnEnvent(object sender, EventArgs e)

        {

            Console.WriteLine("FIRED");

        }

    }

}