监听

 public partial class form1 : form
    {
        public form1()
        {
            initializecomponent();
            dog dog = new dog();
            insertdog(dog);
            dog.onalert();
            //console.writeline();
        }
        public void insertdog(dog dog)
        {
            dog.alerthandler += new dog.aleventhandler(hosteventhandler);
        }
        public void hosteventhandler(object sender, eventargs e)
        {
            console.writeline("{0}\n",sender.tostring());
        }
    }
    public class dog
    {
        public delegate void aleventhandler(object sender, eventargs e);
        public event aleventhandler alerthandler;
        protected  int tm = 0;
        public void onalert()
        {
            if(this.alerthandler!=null)
            {
                while (true)
                {
                    if (tm == 100)
                    {
                        this.alerthandler(this.tm, new eventargs());
                        console.writeline("2\n");
                        tm = 0;
                    }
                    tm++;
                    thread.sleep(10);
                }
            }
        }

    }