求大佬解决一下这个问题

Question

编写3个类：Secretary、Director和Programmer。每个类都包含CalculateSalary方法。为简单起见，只让每个方法显示信息“Nowcalculatingthesalaryfor”，再加上方法所在的类名。假设程序中这些类有许多对象，它们需要保存为一个集合，如保存为一个数组。如何才能将它们保存在一个数组中并通过循环遍历数组也能调用每个对象的CalculateSalary方法，而且对所有对象均调用同一个方法，编写实现以上描述过程的代码。

Answer 1

就是考继承

using System;
using System.Collections.Generic;

namespace ConsoleApp1
{
    class Employee
    {
        public string Message => "Nowcalculatingthesalaryfor";
        public virtual string ClassName { get; }
        public virtual void CalculateSalary()
        {
            Console.WriteLine($"{Message}: {ClassName}.");
        }
    }

    class Secretary : Employee
    {
        public override string ClassName => nameof(Secretary);
    }

    class Director : Employee
    {
        public override string ClassName => nameof(Director);
    }

    class Programmer : Employee
    {
        public override string ClassName => nameof(Programmer);
    }

    class Program
    {
        static void Main(string[] args)
        {
            List<Employee> employees = new List<Employee>
            {
                new Secretary(),
                new Director(),
                new Programmer()
            };

            foreach (var employee in employees)
            {
                employee.CalculateSalary();
            }
        }
    }
}