一道c#练习题希望各位解答

Question

一道c#练习题希望各位解答一下，还有如何使用icomparer这个接口进行比较枚举的值进行排序呢？

Answer 1

enum可以定义数值，按照数值排下就行，
icomparer

using System;
using System.Linq;
using System.Collections.Generic;
namespace ConsoleApp1
{
    enum City
    {
        北京 = 0,
        上海 = 1,
        广州 = 2
    }
    class Person
    {
        public City city { get; set; }
        public string name { get; set; }
    }
    class SortByCity : IComparer<Person>
    {
        public int Compare(Person x, Person y)
        {
            return x.city - y.city;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var persons = new List<Person>{
            new Person{name="姓名1",city=City.上海},
            new Person{name="姓名2",city=City.北京},
            new Person{name="姓名3",city=City.广州},
            new Person{name="姓名4",city=City.北京}
            };
            persons.Sort(new SortByCity { });
            Console.Write(String.Join("\n",persons.Select(i => i.name + "，" + i.city.ToString())));

            Console.ReadKey();
        }

    }
}

怪物

using System;
using System.Linq;
using System.Collections.Generic;
namespace ConsoleApp1
{
    enum MonsterType
    {
        精英怪,
        小怪,
        Boss
    }
    abstract class Monster
    {
        public string name { get; set; }
        public abstract MonsterType type { get; }
        public int Level { get; set; }

        public abstract void StandUp();
        public abstract void Run();
        public abstract void Attack();
    }
    class Monster1 : Monster
    {
        public override MonsterType type { get => MonsterType.精英怪; }
        public override void StandUp()
        {
            Console.WriteLine(this.type + "站立");
        }
        public override void Attack()
        {
            Console.WriteLine(this.type + "攻击");
        }
        public override void Run()
        {
            Console.WriteLine(this.type + "奔跑");
        }
    }
    class Monster2 : Monster
    {
        public override MonsterType type { get => MonsterType.小怪; }
        public override void StandUp()
        {
            Console.WriteLine(this.type + "站立");
        }
        public override void Attack()
        {
            Console.WriteLine(this.type + "攻击");
        }
        public override void Run()
        {
            Console.WriteLine(this.type + "奔跑");
        }
    }
    class Monster3 : Monster
    {
        public override MonsterType type { get => MonsterType.Boss; }
        public override void StandUp()
        {
            Console.WriteLine(this.type + "站立");
        }
        public override void Attack()
        {
            Console.WriteLine(this.type + "攻击");
        }
        public override void Run()
        {
            Console.WriteLine(this.type + "奔跑");
        }
    }

    class MonsterManger
    {
        static MonsterManger mm = null;
        public static MonsterManger MM
        {
            get
            {
                if (mm == null)
                {
                    mm = new MonsterManger();
                    mm.kvMonster = new Dictionary<MonsterType, List<Monster>>();
                }
                return mm;
            }
        }
        public Dictionary<MonsterType,List<Monster>> kvMonster { get; set; }
        public void AddMonster(Monster m)
        {
            if (!kvMonster.ContainsKey(m.type)) kvMonster[m.type] = new List<Monster>();
            kvMonster[m.type].Add(m);
        }
        public void RemoveMonster(Monster m)
        {
            kvMonster[m.type].Remove(m);
        }
        public void ShowMonster()
        {
            foreach (var kp in kvMonster)
            {
                Console.WriteLine(String.Join("\n", kp.Value.Select(i => i.name + "，" + i.type)));
                Console.WriteLine();
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            MonsterManger.MM.AddMonster(new Monster1 { name = "M1-1" });
            MonsterManger.MM.AddMonster(new Monster1 { name = "M1-2" });
            MonsterManger.MM.AddMonster(new Monster1 { name = "M1-3" });


            MonsterManger.MM.AddMonster(new Monster2 { name = "M2-1" });
            MonsterManger.MM.AddMonster(new Monster2 { name = "M2-2" });
            MonsterManger.MM.AddMonster(new Monster2 { name = "M2-3" });
            MonsterManger.MM.AddMonster(new Monster2 { name = "M2-4" });
            MonsterManger.MM.AddMonster(new Monster2 { name = "M2-5" });


            MonsterManger.MM.AddMonster(new Monster3 { name = "M3-1" });

            MonsterManger.MM.ShowMonster();

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

            MonsterManger.MM.RemoveMonster(MonsterManger.MM.kvMonster[MonsterType.小怪][1]);//删除M2-2小怪
            MonsterManger.MM.ShowMonster();

            Console.WriteLine("--------------");
            MonsterManger.MM.RemoveMonster(MonsterManger.MM.kvMonster[MonsterType.小怪][1]);//删除M2-3小怪，注意下标，删除M2-2后下标会变化

            MonsterManger.MM.ShowMonster();

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


            MonsterManger.MM.RemoveMonster(MonsterManger.MM.kvMonster[MonsterType.精英怪][0]);//删除M1-1精英怪
            MonsterManger.MM.ShowMonster();

            Console.ReadKey();
        }

    }
}

参考： c# 实现IComparable、IComparer接口、Comparer类的详解_匆匆那年-CSDN博客 IComparable和ICompare 接口是.net framework 中比较对象的标准方式，这两个接口之间的区别如下：1. IComparable 在要比较的对象的类中实现，可以比较该对象和另一个对象。2.IComparer 在一个单独的类中实现，可以比较任意两个对象。一般情况下，我们使用 IComparable 给出类的默认比较代码，使用其他类给出非默认的比较代码。一、I https://blog.csdn.net/lidandan2016/article/details/78480237