Worker

using System;
using System.Collections.Generic;
using System.Text;

namespace DelegatesAndEvents
{
    //public delegate void WorkPerformedHandler(object sender, WorkPerformedEventArgs e);

    public class Worker
    {
        public event EventHandler<WorkPerformedEventArgs> WorkPerformed;

        public event EventHandler WorkCompleted;
        public virtual void DoWork(int hours, WorkType workType)
        {
            for (int i = 0; i < hours; i++)
            {
                OnWorkPerformed(i + 1, workType);
            }
            OnWorkCompleted();
        }

        protected virtual void OnWorkPerformed(int hours, WorkType workType)
        {
            var del = WorkPerformed as EventHandler<WorkPerformedEventArgs>;
            del?.Invoke(this, new WorkPerformedEventArgs(hours, workType));
        }

        protected virtual void OnWorkCompleted()
        {
            var del = WorkCompleted as EventHandler;
            del?.Invoke(this, EventArgs.Empty);
        }
    }
}