11_5_3给people添加GetOldest()方法,使用上面定义的重载运算符,返回一个Age最大的对象数组

本文链接：https://blog.youkuaiyun.com/edward_faint/article/details/8108964

本文详细介绍了如何使用C#语言通过创建Person类和People类来实现人员的基本信息管理，包括添加、删除、获取人员信息以及比较年龄等功能。重点展示了类的属性定义、构造函数、静态比较运算符的实现以及使用Dictionary集合存储和操作人员数据的方法。

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//file Person.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace _11_5_1
{
    class Person : CollectionBase
    {
        private string name;
        private int age;

        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value ;   
            }
        }

        public int Age
        {
            get 
            {
                return age;
            }
            set
            {
                age = value;
            }
        }

        public Person()
        { }

        public Person(string name, int age)
        {
            this.name = name;
            this.age = age;
        }

        public static bool operator > (Person per1,Person per2)
        {
            return (per1.Age>per2.Age);
        }

        public static bool operator<(Person per1,Person per2)
        {
            return (per1.Age < per2.Age);
        }

        public static bool operator <=(Person per1, Person per2)
        {
            return (per1.Age <= per2.Age);
        }

        public static bool operator >=(Person per1,Person per2)
        {
            return (per1.Age >= per2.Age);
        }
    }
}


//--------------------------------------------

//file People.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace _11_5_1
{
    class People : DictionaryBase
    {
        public void Add(string ID,Person person)
        {
            Dictionary.Add(ID,person);
        }

        public void Remove(string ID)
        {
            Dictionary.Remove(ID);
        }

        public Person this[string ID]
        {
            get
            {
                return (Person)Dictionary[ID];
            }
            set
            {
                Dictionary[ID] = value;
            }
        }

        public People this[int Index]
        {
            get
            {
                return (People)this[Index];
            }
            set
            {
                this[Index] = value;
            }
        }

        //---------------------question 3
        public static Person GetOldest(People peo)
        {
            Person otherPerson = new Person();

            foreach (DictionaryEntry myEntry in peo)
            {
                if (otherPerson != (Person)myEntry.Value)
                {
                    otherPerson = ((Person)myEntry.Value);
                    break;
                }
            }

            foreach(DictionaryEntry myEntry in peo)
            {
                if (otherPerson < (Person)myEntry.Value)
                {
                    otherPerson = (Person)myEntry.Value;
                }
            }
            return otherPerson;
        }
    }
}

//----------------------------------------

//file Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _11_5_1
{
    class Program
    {
        static void Main(string[] args)
        {
            People people = new People();

            Person per1 = new Person("Chuck", 24);
            Person per2 = new Person("Candy", 30);
            Person per3 = new Person("Bob", 29);

            people.Add("Chuck", per1);
            people.Add("Candy", per2);
            people.Add("Bob", per3);

            Console.WriteLine("{0} {1}",
                people["Chuck"].Name, people["Chuck"].Age);
            Console.WriteLine("{0} {1}",
                people["Candy"].Name, people["Candy"].Age);

            Console.WriteLine("-----------------------------");

            //-----------------------------------------------

            if (per1 > per2)
            {
                Console.WriteLine("per1 > per2 of Age");
            }
            if (per1 <= per2)
            {
                Console.WriteLine("per1 <= per2 of Age");
            }
            Console.WriteLine("-----------------------------");


            //---------------------------------------question

            Person per = new Person();
            per = People.GetOldest(people);
            Console.WriteLine("{0} {1}",
                per.Name, per.Age);

            Console.ReadKey();
        }
    }
}