Bài tập ôn luyện OOP + Interface trong C# - Lập Trình C# - Lập Trình C Sharp

#Program.cs

using System;
using System.Collections.Generic;

namespace BT1506
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Nhap id: ");
            int id = int.Parse(Console.ReadLine());

            Console.WriteLine("Nhap ten: ");
            string name = Console.ReadLine();

            Console.WriteLine("Nhap ky nang: ");
            string skills = Console.ReadLine();

            Console.WriteLine("Nhap DOB (yyyy-MM-dd): ");
            string dobStr = Console.ReadLine();
            DateTime dob = ConvertStringToDateTime(dobStr);

            Programmer programmer = new Programmer(skills, dob, id, name);
            programmer.ShowInfo();

            //Yeu cau tao mang List co capacity = 3;
            List<Programmer> programmers = new List<Programmer>();
            List<Programmer> list = new List<Programmer>(3);
            list.Add(programmer);
            list.Add(programmer);
            list.Add(programmer);
            list.Add(programmer);
            list.Add(programmer);
            list.Add(programmer);
            list.Add(programmer);

            foreach (Programmer p in list)
            {
                p.ShowInfo();
            }
        }

        static DateTime ConvertStringToDateTime(string str)
        {
            DateTime myDate = DateTime.ParseExact(str, "yyyy-MM-dd",
                                       System.Globalization.CultureInfo.InvariantCulture);
            return myDate;
        }
    }
}

#IPerson.cs

using System;
namespace BT1506
{
    /**
     * Tat cac thuoc tinh & methods -> public
     */
    public interface IPerson
    {
        string Skills { get; set; }
        DateTime DateOfBirth { get; }
        int Age { get; }
    }
}

#Employee.cs

using System;
namespace BT1506
{
    public abstract class Employee
    {
        private int _id;
        public int ID
        {
            get
            {
                return _id;
            }
        }

        private string _name;
        public string Name
        {
            get
            {
                return _name;
            }
            set
            {
                if(value.Length < 3)
                {
                    throw new Exception();
                }
                _name = value;
            }
        }

        public Employee(int id)
        {
            _id = id;
            Name = "No Name";
        }

        public Employee(int id, string name) : this(id)
        {
            Name = name;
        }

        public abstract void ShowInfo();
    }
}

#Programmer.cs

using System;
namespace BT1506
{
    public class Programmer : Employee, IPerson
    {
        string _skills;
        public string Skills {
            get
            {
                return _skills;
            }
            set
            {
                if(value.Length == 0)
                {
                    throw new Exception();
                }
                _skills = value;
            }
        }

        DateTime _DOB;
        public DateTime DateOfBirth {
            get
            {
                return _DOB;
            }

            set
            {
                _DOB = value;
            }
        }

        int _age;
        public int Age {
            get
            {
                int year = int.Parse(DateOfBirth.ToString("yyyy"));
                int currentYear = int.Parse(DateTime.Now.ToString("yyyy"));
                _age = currentYear - year;
                return _age;
            }
        }

        public Programmer(int id, string name):base(id, name)
        {
            _skills = string.Empty;
            DateOfBirth = DateTime.Now;
        }

        public Programmer(string skills, DateTime dob, int id, string name) : base(id, name)
        {
            Skills = skills;
            DateOfBirth = dob;
        }

        public override void ShowInfo()
        {
            Console.WriteLine("Id: {0} | Name: {1} | Skills: {2} | DOB: {3} | Age: {4}",
                ID, Name, Skills, DateOfBirth, Age);
        }
    }
}