C#控制台商品售卖程序实现类小票全选购商品输出问题

问题解决思路 #

你代码中已经用ProductList字典存储了用户所有选购的商品及对应数量，无法输出全量商品列表的核心原因是没有遍历该字典生成小票内容，只需在找零计算完成后、询问用户是否再次购物前新增小票打印逻辑即可。
另外你原有代码的折扣计算逻辑存在问题：当前仅对总金额减0.7/0.5PHP，不符合常规折扣规则，默认s对应7折（总金额0.7）、v对应5折（总金额0.5），修改代码中同步修正了该问题。

修改后完整代码 #

using System;
using System.Collections.Generic;

namespace KpopMerchShop
{
    class Program
    {
        static void Main(string[] args)
        {
            int choice, quanti, decide, total, cash;
            double change, actualPayTotal;
            string dcount;
            while (true)
            {
                Console.Clear();
                string w = "WELCOME ";
                Console.SetCursorPosition((Console.WindowWidth - w.Length) / 2, Console.CursorTop);
                Console.WriteLine(w);
                Console.WriteLine("");
                System.Threading.Thread.Sleep(2000);

                string p = "HERE'S OUR MERCHANDISES! ";
                Console.SetCursorPosition((Console.WindowWidth - p.Length) / 2, Console.CursorTop);
                Console.WriteLine(p);
                System.Threading.Thread.Sleep(2000);

                string[] products = { "[1]BLACKPINK Lightstick ", "[2]DREAMCATCHER Seasons Greetings",
                "[3]RED VELVET Summer Package"};

                for (int g = 0; g < products.Length; g++)
                {
                    Console.WriteLine(products[g]);
                }

                Dictionary<int, int> ProductList = new Dictionary<int, int>();
                while (true)
                {
                    Console.Write("Pick your product: ");
                    choice = int.Parse(Console.ReadLine());
                    switch (choice)
                    {
                        case 1:
                            Console.WriteLine("BLACKPINK Lightstick 1500php");
                            break;
                        case 2:
                            Console.WriteLine("DREAMCATCHER Seasons Greetings 920php");
                            break;
                        case 3:
                            Console.WriteLine("RED VELVET Summer Package 980php");
                            break;
                    }
                    Console.WriteLine("Quantity of product: ");
                    quanti = int.Parse(Console.ReadLine());
                    if (!ProductList.ContainsKey(choice))
                        ProductList.Add(choice, quanti);
                    else
                        ProductList[choice] += quanti;
                    System.Threading.Thread.Sleep(2000);
                    Console.WriteLine("[1] Add more products \t [2] Pay: ");
                    decide = int.Parse(Console.ReadLine());

                    if (decide == 2)
                        break;
                }
                total = 0;
                foreach (int key in ProductList.Keys)
                    switch (key)
                    {
                        case 1:
                            total += ProductList[key] * 1500;
                            break;
                        case 2:
                            total += ProductList[key] * 920;
                            break;
                        case 3:
                            total += ProductList[key] * 980;
                            break;
                        default:
                            total += 0;
                            break;
                    };
                Console.WriteLine("To Pay: " + total + "php");
                Console.Write("Cash: ");
                cash = Convert.ToInt32(Console.ReadLine());
                Console.Write("Discount[s]suki [v]voucher: ");
                dcount = Console.ReadLine();

                // 修正折扣计算逻辑
                if (dcount == "s")
                {
                    actualPayTotal = total * 0.7;
                    change = cash - actualPayTotal;
                }
                else if (dcount == "v")
                {
                    actualPayTotal = total * 0.5;
                    change = cash - actualPayTotal;
                }
                else
                {
                    actualPayTotal = total;
                    change = cash - actualPayTotal;
                }
                Console.WriteLine("Actual payment amount: " + actualPayTotal.ToString("F2") + "php");
                Console.WriteLine("Change: " + change.ToString("F2") + "php");

                // 新增小票打印逻辑
                Console.WriteLine("\n=====================================");
                string receiptTitle = "KPOP周边结算小票";
                Console.SetCursorPosition((Console.WindowWidth - receiptTitle.Length) / 2, Console.CursorTop);
                Console.WriteLine(receiptTitle);
                Console.WriteLine("-------------------------------------");
                Console.WriteLine("{0,-30} | {1,8} | {2,9} | {3,9}", "商品名称", "购买数量", "单价(PHP)", "小计(PHP)");
                Console.WriteLine("-------------------------------------");
                foreach (var item in ProductList)
                {
                    string productName = "";
                    int price = 0;
                    switch (item.Key)
                    {
                        case 1:
                            productName = "BLACKPINK 应援棒";
                            price = 1500;
                            break;
                        case 2:
                            productName = "DREAMCATCHER 季节问候台历";
                            price = 920;
                            break;
                        case 3:
                            productName = "RED VELVET 夏日周边包";
                            price = 980;
                            break;
                    }
                    int subTotal = price * item.Value;
                    Console.WriteLine("{0,-30} | {1,10} | {2,9} | {3,9}", productName, item.Value, price, subTotal);
                }
                Console.WriteLine("-------------------------------------");
                string discountType = dcount switch
                {
                    "s" => "Suki会员7折",
                    "v" => "优惠券5折",
                    _ => "无优惠"
                };
                Console.WriteLine("{0,-30}：{1,18} PHP", "原始应付总金额", total);
                Console.WriteLine("{0,-30}：{1,18:F2} PHP", "优惠后应付金额", actualPayTotal);
                Console.WriteLine("{0,-30}：{1,18} PHP", "实付现金", cash);
                Console.WriteLine("{0,-30}：{1,20}", "优惠类型", discountType);
                Console.WriteLine("{0,-30}：{1,18:F2} PHP", "找零金额", change);
                Console.WriteLine("=====================================\n");
                // 小票打印逻辑结束

                Console.WriteLine("Another shopping? [1]Yes [2] No");
                choice = int.Parse(Console.ReadLine());
                if (choice == 2)
                    break;
            }
        }
    }
}

内容的提问来源于stack exchange，提问作者MULTI FANDOM