c#在控制台实现继承的练习

Question

编写一个控制台程序，在该程序中构造一个Person基类（至少有姓名），再分别构造Student和Teacher派生类，要求具有不同的特征（分别扩展学号、工号），能通过静态成员（static）自动记录由不同派生类创建的对象的人数（可以在构造方法中实现）

Answer 1

using System;
namespace HelloWorldApplication
{
    class Person
    {
        public string Name { get; set; }
        public static int count = 0;
        public Person() { count++; }
        ~Person() { count--; }
    }
    class Student : Person
    {
        public string StuID { get; set; }
        public new static int count = 0;
        public Student() { count++; }
        ~Student() { count--; }
    }
    class Teacher : Person
    {
        public string WorkID { get; set; }
        public new static int count = 0;
        public Teacher() { count++; }
        ~Teacher() { count--; }
    }
   class HelloWorld
   {
       static void Main(string[] args)
       {
           Person p1 = new Person();
           Person p2 = new Person();
           Person p3 = new Person();
           Student s1 = new Student();
           Student s2 = new Student();
           Teacher t = new Teacher();
           Console.WriteLine($"person {Person.count}");
           Console.WriteLine($"student {Student.count}");
           Console.WriteLine($"teacher {Teacher.count}");
       }
   }
}