delegate void del();

    class MyClass1
    {
        public event del eventcount;//创建事件并发布

        public void Count()
        {
            for (int i = 0; i < 100; i++)
            {
                if (i % 12 == 0 && eventcount != null)
                {
                    eventcount();
                }
            }
        }
    }
    class MyClass2
    {
        public int sum { get; set; }
        public  MyClass2(MyClass1 myClass1)
        {
            sum = 0;
            myClass1.eventcount += sumj;//订阅事件
        }
        void sumj()
        {
            sum++;
        }
    }

    class Program
    {

        static void Main(string[] args)
        {
            MyClass1 myClass1 = new MyClass1();
            MyClass2 myClass2 = new MyClass2(myClass1);

            myClass1.Count();
            Console.WriteLine(myClass2.sum);
        }
    }

 

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