.Net学习笔记----2015-07-21(C#基础复习05，里氏转换)

    class Program
    {
        static void Main(string[] args)
        {
            Person person = new Student();
            Teacher t = person as Teacher; //as转换成功转成对应的对象，转换失败返回null
            //Student s = (Student)person;//转换成功，因为person里装着Student的对象
            //Teacher s = (Teacher)person;//转换失败，因为person里装着Student的对象
            if(person is Student)
            {
                Console.WriteLine("OK，可以转换");
            }
            else
            {
                Console.WriteLine("NO，不可以转换");
            }
            //Console.WriteLine(s.ID);
            Console.ReadKey();
            //Student student = new Student();
            //Teacher teacher = new Teacher();
            
        }
    }

    public class Person
    {
        public string Name
        { get; set; }
    }
    public class Student : Person
    {
        public int ID
        { get; set; }

    }
    public class Teacher : Person
    {
        public double Salary { get; set; }
    }