ダミーオブジェクトとオブジェクトのマルチステート

Virtual memebers:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace ConsoleApplication2

{

    class Person

    {

        public string Firstname { get; set; }

        public string SecondName { get; set; }

        public virtual void Display()

        {

            Console.WriteLine("Person - {0}, {1}", Firstname, SecondName);

        }

        public virtual int CalculateYearIncome(int year)

        {

            if (year < 2000)

            {

                return 50000;

            }

            return 10000;

        }

    }

    class Employee : Person

    {

        public int YearIncome { get; set; }

        public override void Display()

        {

            Console.WriteLine("Employee - {0}, {1}, {2}", Firstname, SecondName, YearIncome);

        }

        public override int CalculateYearIncome(int year)

        {

            return 1000;

        }

    }



    class Program

    {

        static void Main(string[] args)

        {

            List<Person> myList = new List<Person>();

            Person p1 = new Person();

            p1.Firstname = "Nelson";

            p1.SecondName = "LaQuest";

            Employee e1 = new Employee();

            e1.Firstname = "whoa";

            e1.SecondName = "hey";

            e1.YearIncome = 23;

            myList.Add(p1);

            myList.Add(e1);



            foreach (var item in myList)

            {

                item.Display();

                Console.WriteLine("Year income of 2004 -> {0}", item.CalculateYearIncome(2004));

            }

            Console.ReadKey();



        }

        



        static string GetString(string prompt)

        {

            Console.Write("{0}>", prompt);

            return Console.ReadLine();

        }

    }

}

 
 
Polymorphism:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace ConsoleApplication2

{

    class Person

    {

        public string Firstname { get; set; }

        public string SecondName { get; set; }

        public virtual void Display()

        {

            Console.WriteLine("Person - {0}, {1}", Firstname, SecondName);

        }

    }

    class Employee : Person

    {

        public int YearIncome { get; set; }

        public override void Display()

        {

            Console.WriteLine("Employee - {0}, {1}, {2}", Firstname, SecondName, YearIncome);

        }

    }



    class Program

    {

        static void Main(string[] args)

        {

            List<Person> myList = new List<Person>();



            for (int i = 0; i < 3; i++)

            {

                myList.Add(GetPersonInput());

            }

            foreach (var item in myList)

            {

                item.Display();

            }



            Console.ReadKey();



        }

        static Person GetPersonInput()

        {

            while (true)

            {

                Console.WriteLine("[1] - Person
[2] - Employee");

                int choice = int.Parse(Console.ReadLine());



                if (choice == 1)

                {

                    Person person = new Person();

                    person.Firstname = GetString("First Name");

                    person.SecondName = GetString("Second Name");

                    return person;

                }

                else if (choice == 2)

                {

                    Employee employee = new Employee();

                    employee.Firstname = GetString("First Name");

                    employee.SecondName = GetString("Second name");

                    Console.WriteLine("Year of Income> ");

                    employee.YearIncome = int.Parse(Console.ReadLine());

                    return employee;

                }

            }

            

        }



        static string GetString(string prompt)

        {

            Console.Write("{0}>", prompt);

            return Console.ReadLine();

        }

    }

}