Ｃ＃as关键字

    interface IFood    {        void Food();    }    interface IVoice    {        void Voice();    }    class Cat : IFood, IVoice    {        public void Food()        {            Console.WriteLine("吃老鼠");        }        public void Voice()        {            Console.WriteLine("喵喵喵");        }    }    class Test    {        static void Main(string[] args)        {            IVoice pVocie = new Cat();//pVoice只能调用属于IVoice中的方法            pVocie.Voice();            IFood pFood = pVocie as IFood;            pFood.Food();            System.Console.ReadLine();        }    }