《重构》C#版实现（一）构建参考结果的测试用例

首先，列出的是第一个“电影租赁”案例的C#版初始代码：
[csharp]
using System;
using System.Collections.Generic;

namespace CH01_MovieRentalHouse
{
    public class Movie
    {
        public const int CHILDRENS = 2;
        public const int REGULAR = 0;
        public const int NEW_RELEASE = 1;

        public string Title { get; private set; }
        public int PriceCode { get; private set; }

        public Movie(string title, int priceCode)
        {
            Title = title;
            PriceCode = priceCode;
        }
    }

    public class Rental
    {
        public Movie Movie { get; private set; }
        public int DaysRented { get; private set; }

        public Rental(Movie rented, int days)
        {
            Movie = rented;
            DaysRented = days;
        }
    }

    public class Customer
    {
        public string Name { get; private set; }

        private List<Rental> Rentals = new List<Rental>();

        public Customer(string name)
        {
            Name = name;
        }

        public void Add(Rental rental)
        {
            Rentals.Add(rental);
        }

        public string Statement()
        {
            double totalAmount = 0;
            int frequentRenterPoints = 0;
            string result = "Rental Record for " + Name + "\n";
            foreach (Rental rental in Rentals)
            {
                double thisAmount = 0;

                // determine amounts for each line
                switch (rental.Movie.PriceCode)
                {
                    case Movie.REGULAR:
                        thisAmount += 2;
                        if (rental.DaysRented > 2)
                            thisAmount += (rental.DaysRented - 2) * 1.5;
                        break;
                    case Movie.NEW_RELEASE:
                        thisAmount += rental.DaysRented * 3;
                        break;
                    case Movie.CHILDRENS:
                        thisAmount += 1.5;
                        if (rental.DaysRented > 3)
                            thisAmount += (rental.DaysRented - 3) * 1.5;
                        break;
                }

                // add frequent renter points
                frequentRenterPoints++;
                // add bonus for a two day new release rental
                if (rental.Movie.PriceCode == Movie.NEW_RELEASE &&
                    rental.DaysRented > 1) frequentRenterPoints++;

                // show figures for this rental
                result += "\t" + rental.Movie.Title + "\t" + thisAmount.ToString() + "\n";
                totalAmount += thisAmount;
  &nb

补充：软件开发 , C# ,