class Program
  {
    static void Main(string[] args)
    {
      //委托就是個(gè)“類(lèi)”，也需要“實(shí)例化”，讓“ass1”通知“Waiteress”。
      Convey_Dele ass1 = new Convey_Dele(Waiteress);

      //讓“ass2”通知“Cooker”
      Convey_Dele ass2 = new Convey_Dele(Cooker);

      //“boss”通知兩個(gè)助理“ass1和ass2”，術(shù)語(yǔ)為“合并委托（或“多路廣播委托”）”
      Convey_Dele boss = new Convey_Dele(ass1 + ass2);

      //“boss”發(fā)話
      boss("一位貴賓要來(lái)了！");

      Console.ReadKey();
    }

    //聲明一個(gè)叫做“Convey_Dele”的委托，形參為“string command”
    public delegate void Convey_Dele(string command);

    //構(gòu)造一個(gè)名為“Waiteress”的函數(shù)，構(gòu)造函數(shù)的形參必須與委托形參一致！
    public static void Waiteress(string command)
    {
      //“Waiteress”要去干的事兒
      Console.WriteLine("女服務(wù)員接到通知：" + command + "所以她要去迎接客人");
    }

    public static void Cooker(string command)
    {
      Console.WriteLine("廚師也接到了通知：" + command + "所以他去準(zhǔn)備飯菜");
    }
  }

class Program
  {
    static void Main(string[] args)
    {
      Convey_Dele ass1, ass2;

      //另寫(xiě)函數(shù)再實(shí)例化太麻煩了，直接在這里把函數(shù)一起寫(xiě)了。術(shù)語(yǔ)“匿名函數(shù)”，“delegate”是關(guān)鍵字
      ass1 = delegate (string command) { Console.WriteLine("女服務(wù)員接到通知：" + command + "所以她要去迎接客人"); };

      //匿名函數(shù)也太麻煩了，還得寫(xiě)“delegate”，改用一個(gè)符號(hào)來(lái)表示，術(shù)語(yǔ)“蘭姆達(dá)表達(dá)式”
      ass2 = (string command) => { Console.WriteLine("廚師也接到了通知：" + command + "所以他去準(zhǔn)備飯菜"); };

      //等同于 ass1 = ass1 + ass2，基本的“加等”運(yùn)算符，“減等”也是可以使用的~ 比如：若ass1 = ass1 + ass2，那ass1 -= ass1等同于ass1=ass2
      ass1 += ass2;

      ass1("一位貴賓要來(lái)了！");

      Console.ReadKey();
    }

    public delegate void Convey_Dele(string command);
  }