Headfirst design Pattern---Policy Mode C # implementation

Duck base class to encapsulate behavior.

class Duck    {        protected  iflybehavior flybehavior;         protected iquackbehavior quackbehavior;          Public void Performquack ()        {            quackbehavior.quack ();        }          Public void performfly ()        {            flybehavior.fly ();        }    }

Flight behavior base class

Interface Iflybehavior    {        void  Fly ();    }

Duck-ringing behavior base class

Interface Iquackbehavior    {        void  quack ();    }

Different behavior of the flight

class Flynoway:iflybehavior    {        publicvoid  Fly ()        {            Console.WriteLine ("  Not fly ");        }    }

 Public class Flywithwings:iflybehavior    {        publicvoid  Fly ()        {            Console.WriteLine (" fly " );        }    }

Ducks are the same way.

Sub-class Duck

class Mallardduck:duck    {        public  Mallardduck ()        {            new  mutequack ();             New flywithwings ();        }    }

How the main function is called

class program    {        staticvoid Main (string[] args)        {            new  Mallardduck ();            Mallardduck.performfly ();            Mallardduck.performquack ();            Console.readkey ();        }    }

Headfirst design Pattern---Policy Mode C # implementation