using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

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

            personList.Add(new Person { Age = 10, Name = "John" });

            personList.Add(new Person { Age = 15, Name = "Ann" });

            personList.Add(new Person { Age = 8, Name = "Kevin" });

            Console.WriteLine("---------Sắp xếp theo tuổi-----------");

            personList.Sort(new PersonAgeComparer());           

            foreach (var item in personList)

            {

                Console.WriteLine(item.Name + ":" + item.Age);

            }

            Console.WriteLine("---------Sắp xếp theo tên-----------");

            personList.Sort(new PersonNameComparer());           

            foreach (var item in personList)

            {

                Console.WriteLine(item.Name + ":" + item.Age);

            }

    }

     public class Person 

    {

        public int Age { get; set; }

        public string Name { get; set; }        

    }

     class PersonAgeComparer: IComparer<Person>

    {

        public int Compare(Person x, Person y)

        {

            return x.Age.CompareTo(y.Age);

        }

    }

    class PersonNameComparer: IComparer<Person>

    {

        public int Compare(Person x, Person y)

        {

            return x.Name.CompareTo(y.Name);

        }

    }

}