C#高级------委托

namespace out_ref
{
    //声明一个委托
    public delegate void MyDelegate();
    class Program
    {
        static void Main(string[] args)
        {
            MyDelegate mdl = Say;
            Do(mdl);
            Console.ReadKey();
        }

        static void Do(MyDelegate mdl)
        {
            mdl();
        }

        static void Say()
        {
            Console.WriteLine("哈哈");
        }

    }
}

namespace out_ref
{
    //声明一个委托
    public delegate int MyAdd(int n1,int n2);
    class Program
    {
        static void Main(string[] args)
        {
            Do(Sum);
            Console.ReadKey();
        }

        static void Do(MyAdd myadd)
        {
            int sum = myadd(1,3);
            Console.WriteLine(sum);
        }

        static int Sum(int n1,int n2)
        {
            return n1 + n2;
        }

    }
}

namespace out_ref
{
   //委托占位案例
    public delegate void Myadd();
    class Program
    {
        static void Main(string[] args)
        {
            Do(Dafeiji);
            Console.ReadKey();
        }

        static void Do(Myadd myadd)
        {
            Console.WriteLine("我正在吃饭....");
            myadd();
            Console.WriteLine("我正在睡觉....");
        }

        static void Play()
        {
            Console.WriteLine("我在玩游戏....");
        }

        static void Dafeiji()
        {
            Console.WriteLine("我正在打飞机....");
        }

    }
}