.Net学习笔记----2015-06-23(继承(里氏转换))

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

/*里氏转换
 * 1，子类可以赋值给父类：如果一个地方需要一个父类作为参数，可以给一个子类代替
 * 2，如果父类中装的是子类对象，那么可以将这个父类对象强制转换成子类对象
 * 
 * 子类对象可以调用父类中的成员，但是父类对象只能调用自己的成员
 * **/

namespace _01里氏转换
{
    class Program
    {
        static void Main(string[] args)
        {
            //子类可以赋值给父类
            //Student s = new Student();
            Person p = new Student();//s

            //string str = string.Join("|", new string[] { "1", "2", "3", "4" });
            //Console.WriteLine(str);
            //Console.ReadKey();

            //如果父类中装的是子类对象，那么可以将这个父类对象强制转换成子类对象
            Student ss = (Student)p;
            ss.SayHello();
            Console.ReadKey();

            
        }
    }
}　　

if(p is Teacher)
            {
                Teacher ss = (Teacher)p;
                ss.TeacherSayHello();
            }
            else
            {
                Console.WriteLine("转换失败");
            }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 里氏转换练习
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建10个对象，通过循环，调用他们各自打招呼的方法
            //Student s = new Student();
            //Person p = new Person();
            //ShuaiGuo sg = new ShuaiGuo();

            Person[] pers = new Person[10];
            Random r = new Random();
            for (int i = 0; i < pers.Length; i++)
            {
                int rNumber = r.Next(1, 7);//此范围表示1-6
                switch (rNumber)
                {
                    case 1: pers[i] =new Student();
                        break;
                    case 2: pers[i] = new Teacher();
                        break;
                    case 3: pers[i] = new ShuaiGuo();
                        break;
                    case 4: pers[i] = new MeiNv();
                        break;
                    case 5: pers[i] = new YeShou();
                        break;
                    case 6: pers[i] = new Person();
                        break;
                }//switch
            }//for

            for (int i = 0; i < pers.Length; i++)
            {
                if(pers[i] is Student)
                {
                    ((Student)pers[i]).StudentSayHi();
                }
                else if(pers[i] is Teacher)
                {
                    ((Teacher)pers[i]).TeacherSayHi();
                }
                else if(pers[i] is ShuaiGuo)
                {
                    ((ShuaiGuo)pers[i]).ShuaiGuoSayHi();
                }
                else if(pers[i] is MeiNv)
                {
                    ((MeiNv)pers[i]).MeiNvSayHi();
                }
                else if (pers[i] is YeShou)
                {
                    ((YeShou)pers[i]).YeShouSayHi();
                }
                else
                {
                    pers[i].PersonSayHi();
                }
            }

            Console.ReadKey();

        }
    }
}