C#_delegate - Pair<T> 静态绑定

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本文介绍了一个使用 C# 实现的简单泛型集合类 Pair 的例子，该类利用委托来决定两个元素的先后顺序，并展示了如何通过 Dog 和 Student 类型的具体实例来运用这些功能。

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<T>
    {
        //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<Dog>.WhichIsFirst OderDog = new Pair<Dog>.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<Student>.WhichIsFirst OrderStudents =
            new Pair<Student>.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<Student> studentPair = new Pair<Student>(Mary,Jess);
            Pair<Dog> dogPair = new Pair<Dog>(Milo, Free);

            studentPair.Sort(Student.OrderStudents) ;
            Console.WriteLine(studentPair.ToString());

            Console.ReadLine();
        }
    }

}