为什么要使用事件而不是委托变量？

用委托变量会让客户端Main方法里可以直接调用 用事件则提高了封装性

  class Program
    {
        static void Main(string[] args)
        {
            Pub p = new Pub();
            Sub s = new Sub();
            p.NumberChange += new NuberChangeEventHand(s.OnNumberChanged);
            p.DoSomeThing();
            p.NumberChange(100);
            Console.ReadKey();

        }
    }
    public delegate void NuberChangeEventHand(int count);
    public class Pub {
        private int count;
        public NuberChangeEventHand NumberChange;
        //public event NuberChangeEventHand NumberChange; 
        public void DoSomeThing()
        {
            if (NumberChange != null)
            {
                count++;
                NumberChange(count);
            }
        }

    }
    public class Sub {
        public void OnNumberChanged(int count)
        {
            Console.WriteLine("显示：{0}",count);

        }
    }