C# 事件 通过扩展EventArgs 传递数据

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp5
{
    public class IncrementEventArgs : EventArgs
    { 
        public int IncrementCount { get; set; }
    }


    class Incrementer
    {

        public event EventHandler<IncrementEventArgs> CountedDozen;

        public void DoCount()
        {
            IncrementEventArgs args = new IncrementEventArgs();
            for (int i = 1; i < 100; i++)
            {
                if (i % 12 == 0 && CountedDozen != null)
                {
                    args.IncrementCount = i;

                    CountedDozen(this, args);
                }
            }
        
        }

    }

    class Dozens
    {
        public int DozensCount { get; private set; }

        public Dozens(Incrementer incrementer)
        {
            DozensCount = 0;
            incrementer.CountedDozen += IncrementDozensCount;
        }

        private void IncrementDozensCount(object sender, IncrementEventArgs e)
        {
            Console.WriteLine($"Incremented at iteration:{e.IncrementCount}  {sender.ToString()}");


            Console.WriteLine($" DoCount   ---    {DozensCount}");

            DozensCount++;
        }
    }


    class Program
    {


        static void Main(string[] args)
        {
            Incrementer incrementer = new Incrementer();

            Dozens dozens = new Dozens(incrementer);

            incrementer.DoCount();

            Console.Read();


        }
    }
}