敏捷软件开发 原则、模式与实践 第9章的例子程序（C#版）

代码中为每个形状指定了序号，如果再来一颗子弹，让你要按类型打印的同时，还要按照序号从小到大排列怎么做呢？

using System;
using System.Collections.Generic;

namespace DesignPattern
{
    class Program
    {
        public static readonly string[] OrderStrings =
        {
            nameof(Square),
            nameof(Triangle),
            nameof(Circle), 
            null
        };

        static void Main(string[] args)
        {
            // 产生若干个随机图形
            Random random = new Random();
            var shapes = new List<Shape>();
            for (int i = 0; i < 100; i++)
            {
                var value = random.Next(0, 15);
                if (value < 5)
                {
                    shapes.Add(new Square() { Index = i });
                }
                else if (value < 10)
                {
                    shapes.Add(new Triangle() { Index = i });
                }
                else
                {
                    shapes.Add(new Circle() { Index = i });
                }
            }

            shapes.Sort(
                (left, right) =>
                {
                    if (left < right)
                    {
                        return -1;
                    }

                    if (left > right)
                    {
                        return 1;
                    }

                    return 0;
                });
            shapes.ForEach(shape => shape.Draw());

            Console.ReadLine();
        }
    }
    
    public class Shape
    {
        public int Index { get; set; }

        public virtual void Draw()
        {
            Console.WriteLine($"画了Shape基类{Index}");
        }

        public static bool operator <(Shape left, Shape right)
        {
            var leftTypeName = left.GetType().Name;
            var leftIndex = -1;
            var rightTypeName = right.GetType().Name;
            var rightIndex = -1;
            for (int i = 0; i < Program.OrderStrings.Length; i++)
            {
                if (leftTypeName == Program.OrderStrings[i])
                {
                    leftIndex = i;
                }

                if (rightTypeName == Program.OrderStrings[i])
                {
                    rightIndex = i;
                }
            }
            return leftIndex < rightIndex;
        }

        public static bool operator >(Shape left, Shape right)
        {
            return !(left < right);
        }
    }

    public class Square:Shape
    {
        public override void Draw()
        {
            Console.WriteLine($"画了正方形{Index}");
        }
    }

    public class Circle : Shape
    {
        public override void Draw()
        {
            Console.WriteLine($"画了圆{Index}");
        }
    }

    public class Triangle : Shape
    {
        public override void Draw()
        {
            Console.WriteLine($"画了三角形{Index}");
        }
    }
}