41.C#--里氏转换法--创建10个对象 通过一个循环 去调用他们各自打招呼的方法

namespace _41.里氏转换法
{
class Program
{
//创建10个对象 通过一个循环 去调用他们各自打招呼的方法
//1、里氏转换
//1)、子类可以赋值给父类
//2)、如果父类中装的是子类对象，那么可以将这个父类强转为子类对象。
static void Main(string[] args)
{
Person[] pers = new Person[10]; //新建10个对象
Random r = new Random(); //声明一个随机数
for (int i = 0; i <pers.Length; i++)//通过循环给Person赋值
{
int rNmuber = r.Next(1, 8);
switch (rNmuber)
{
case 1:pers[i] = new Student(); //当1-7时，子类赋值给父类
break;
case 2:pers[i] = new Teacher();
break;
case 3:pers[i] = new Doctor();
break;
case 4:pers[i] = new Police();
break;
case 5:pers[i] = new Nurse();
break;
case 6:pers[i] = new Driver();
break;
default:pers[i] = new Person();
break;

            }
        }
        for (int i = 0; i < pers.Length; i++)  // 通过一个for循环进行取值
        {
            if(pers[i] is Student)  //如果可以转成student
            {
                ((Student)pers[i]).StudentSayHello(); //父类强转成子类，然后调用打招呼方法
            }
            else if(pers[i] is Teacher)   //如果可以转成Teacher
            {
                ((Teacher)pers[i]).TeacherSayhello();//父类强转成子类，然后调用打招呼方法
            }

            else if(pers[i] is Doctor)
            {
                ((Doctor)pers[i]).DoctorSayHello(); //父类强转成子类，然后调用打招呼方法
            }

            else if(pers[i] is Police)
            {
                ((Police)pers[i]).PoliceSayHello(); //父类强转成子类，然后调用打招呼方法
            }

            else if(pers[i] is Nurse)
            {
                ((Nurse)pers[i]).NurseSayHello(); //父类强转成子类，然后调用打招呼方法
            }
            else if(pers[i] is Driver)
            {
                ((Driver)pers[i]).DriverSayHello(); //父类强转成子类，然后调用打招呼方法
            }
            else
            { 
                pers[i].PersonSayHello(); 
            }

        }
        Console.ReadKey();

    }

//新建类
public class Person //父类
{
public void PersonSayHello()
{
Console.WriteLine("我是父类");
}
}
public class Student:Person
{
public void StudentSayHello()
{
Console.WriteLine("我是学生");
}
}
public class Teacher : Person
{
public void TeacherSayhello()
{
Console.WriteLine("我是老师");
}
}
public class Doctor:Person
{
public void DoctorSayHello()
{
Console.WriteLine("我是医生");
}
}
public class Police : Person
{
public void PoliceSayHello()
{
Console.WriteLine("我是警察");
}
}
public class Nurse : Person
{
public void NurseSayHello()
{
Console.WriteLine("我是护士");
}
}
public class Driver:Person
{
public void DriverSayHello()
{
Console.WriteLine("我是司机");
}
}
}
}