示例#1
0
        private void BeHappy(object item)
        {
            IEmotional emotional = item as IEmotional; // conditional down casting

            if (emotional != null)
            {
                Console.Write($"{item.GetType().Name}: ");
                emotional.BeHappy();
            }
        }
        private void BeHappy(object obj)
        {
            IEmotional emotional = obj as IEmotional;

            if (emotional != null)
            {
                Console.WriteLine("{0}", obj.GetType().Name);
                emotional.BeHappy();
            }
        }