委托和匿名委托

      
        public
      
      
        delegate
      
      
        void
      
      
         del();

            del d 
      
      =
      
         Func;

            d.Invoke();

 
      
      
        public
      
      
        static
      
      
        void
      
      
         Func()

        {

            Console.WriteLine(
      
      
        "
      
      
        i am delegate
      
      
        "
      
      
        );

        }





 
      
      
        //
      
      
        无返回值
      
      

            Action<
      
        string
      
      > a1 = 
      
        delegate
      
      (
      
        string
      
       a) { Console.WriteLine(
      
        "
      
      
        I am action :{0}
      
      
        "
      
      
        , a); };

            Action
      
      <
      
        string
      
      > a2 = (a => { Console.WriteLine(
      
        "
      
      
        I am action :{0}
      
      
        "
      
      
        ,a); });

            a1.Invoke(
      
      
        ""
      
      
        );

            

           

            
      
      
        //
      
      
        有返回值
      
      

            Func<
      
        string
      
      > f = () => { 
      
        return
      
      
        ""
      
      
        ; };

            Func
      
      <
      
        string
      
      , 
      
        string
      
      > f1 = a => { 
      
        return
      
      
         a; };



            
      
      
        string
      
       re =
      
         f.Invoke();

            
      
      
        string
      
       re1 = f1.Invoke(
      
        ""
      
      
        );



            
      
      
        //
      
      
        返回bool
      
      

            Predicate<
      
        int
      
      > pr = a =>
      
        

            {

                
      
      
        if
      
       (a % 
      
        2
      
       == 
      
        0
      
      
        )

                { 
      
      
        return
      
      
        true
      
      
        ; }

                
      
      
        else
      
      
        

                { 
      
      
        return
      
      
        false
      
      
        ; }

            };