class Person : IComparable
    {
        public Person(string name, int age)
        {
            Name = name; Age = age;
        }
        public string Name { get; set; }
        public int Age { get; set; }
       public  int CompareTo(object obj)  //实现该比较方法即可
        {
            if (obj is Person)
            {
                Person p = obj as Person;
                return this.Age.CompareTo(p.Age);
            }
            else
            {
                throw new ArgumentException("Object to compare to is not a Person object");
            }
        }
    }

static void Main(string[] args)
        {
            List<Person> personlist = new List<Person>();
            personlist.Add(new Person("马六",89));
            personlist.Add(new Person("张三",33));
            personlist.Add(new Person("李四",3));
            personlist.Add(new Person("王五", 244));
            personlist.Sort();
            foreach(Person p in personlist)
            {
                Console.Write("姓名:"+p.Name+"  年龄:"+p.Age);
                Console.Write("\n");
                
            }
            Console.ReadKey(); 
        }

姓名：李四    年龄：3
姓名：张三    年龄：33
姓名：马六    年龄：89
姓名：王五    年龄：244