using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 内部类使用接口实现排序{    class Person    {        private string _name;        private int _age;        public Person(string name, int age)        {            _name = name;            _age = age;        }        public string Name        {            get { return _name; }        }        public int Age        {            get { return _age; }        }        private static AgeComparer _ageCom = null;   //仅是一个静态变量。        public static IComparer<Person> AgeCom        {            get            {                if (_ageCom == null)  //当第一次访问静态属性的时候，自动创建一个对象。                {                    _ageCom = new AgeComparer();                }                return _ageCom;            }        }        private class AgeComparer : IComparer<Person>        {            int IComparer<Person>.Compare(Person x, Person y)            {                return x._age.CompareTo(y._age);            }        }    }    class Program    {        static void Main(string[] args)        {            Person[] p1 = new Person[5];            p1[0] = new Person("王亮", 27);            p1[1] = new Person("张明敏", 21);            p1[2] = new Person("孙晓峰", 28);            p1[3] = new Person("赫敏", 25);            p1[4] = new Person("刘铭", 23);            foreach (Person p in p1)            {                Console.WriteLine(p.Name + " " + p.Age.ToString());            }            Console.WriteLine("将对年龄进行排序并打印结果：");            Array.Sort(p1, Person.AgeCom);            foreach (Person p in p1)            {                Console.WriteLine(p.Name + " " + p.Age.ToString());            }            Console.ReadKey();        }    }}