using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;namespace Starter{    public enum Comparison    {        theFirstComesFirst = 1,        theSecondComesFirst = 2    }    //包含两项的简单集合    public class Pair
    
         {        //存放两个对象的私有数组        private T[] thePair = new T[2];        //委托声明        public delegate Comparison WhichIsFirst(T obj1, T obj2);        //构造方法，参数为两个对象，按接收顺序添加        public Pair(T firstObject, T secondObject)        {            thePair[0] = firstObject;            thePair[1] = secondObject;        }        //公共方法，按对象具体顺序范畴排序 - 被绑定的函数的返回值作为函数的参数        public void Sort(WhichIsFirst theDelegatedFunc)        {            if (theDelegatedFunc(thePair[0], thePair[1]) == Comparison.theSecondComesFirst)            {                T temp = thePair[0];                thePair[0] = thePair[1];                thePair[1] = temp;            }        }        //反序排列        public void ReverSort(WhichIsFirst theDelegatedFunc)        {            if (theDelegatedFunc(thePair[0], thePair[1]) == Comparison.theFirstComesFirst)            {                T temp = thePair[0];                thePair[0] = thePair[1];                thePair[1] = temp;            }        }        //要求两个对象提供字符串值        public override string ToString()        {            return thePair[0].ToString() + ", " + thePair[1].ToString();        }    }    public class Dog    {        //静态绑定        public static readonly Pair
     
      .WhichIsFirst OderDog = new Pair
      
       .WhichIsFirst(WhichDogComesFirst);        private int weight;        public Dog(int weight)        {            this.weight = weight;        }        public static Comparison WhichDogComesFirst(Dog d1,Dog d2)        {            return d1.weight > d2.weight ?                Comparison.theSecondComesFirst : Comparison.theFirstComesFirst;        }        public override string ToString()        {            return weight.ToString();        }    }    public class Student    {        //类中进行静态绑定        public static readonly Pair
       
        .WhichIsFirst OrderStudents =            new Pair
        
         .WhichIsFirst(Student.WhichStudentComesFirst);        private string name;        public Student(string name)        {            this.name = name;        }        public static Comparison WhichStudentComesFirst(Student s1, Student s2)        {            return (String.Compare(s1.name, s2.name)<0 ?                Comparison.theFirstComesFirst : Comparison.theSecondComesFirst                );                        }        public override string ToString()        {            return name;        }    }    class Program    {        static void Main(string[] args)        {            Student Jess = new Student("Jess");            Student Mary = new Student("Mary");            Dog Milo = new Dog(26);            Dog Free = new Dog(12);            Pair
         
           studentPair = new Pair
          
           (Mary,Jess); Pair
           
             dogPair = new Pair
            
             (Milo, Free); studentPair.Sort(Student.OrderStudents) ; Console.WriteLine(studentPair.ToString()); Console.ReadLine(); } }}