C#如何實現簡單訂單管理程序

這篇文章主要介紹“C#如何實現簡單訂單管理程序”的相關知識，小編通過實際案例向大家展示操作過程，操作方法簡單快捷，實用性強，希望這篇“C#如何實現簡單訂單管理程序”文章能幫助大家解決問題。

訂單管理的控制臺程序，能夠實現添加訂單、刪除訂單、修改訂單、查詢訂單、序列化與反序列化訂單功能。

主要的類有Order（訂單）、OrderItem（訂單明細項），OrderService（訂單服務），訂單數據可以保存在OrderService中一個List中。在Program里面可以調用OrderService的方法完成各種訂單操作。

要求：

（1）使用LINQ語言實現各種查詢功能，查詢結果按照訂單總金額排序返回。
（2）在訂單刪除、修改失敗時，能夠產生異常并顯示給客戶錯誤信息。
（3）作業的訂單和訂單明細類需要重寫Equals方法，確保添加的訂單不重復，每個訂單的訂單明細不重 復。
（4）訂單、訂單明細、客戶、貨物等類添加ToString方法，用來顯示訂單信息。
（5）OrderService提供排序方法對保存的訂單進行排序。默認按照訂單號排序，也可以使用Lambda表達式進行自定義排序。
（6）在OrderService中添加一個Export方法，可以將所有的訂單序列化為XML文件；添加一個Import方法可以從XML文件中載入訂單。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Xml.Serialization;

namespace exercise20200320
{
    class Program
    {
        static void Main(string[] args)
        {
            AllOrder a = new AllOrder();
            bool judge_ = true;
            while (judge_)
            {
                Console.WriteLine("輸入1增加訂單，輸入2刪除訂單，輸入3查詢訂單，輸入4顯示所有訂單，輸入5根據訂單號為訂單排序,輸入6序列化訂單，輸入7反序列化訂單，輸入8退出");
                string choose1 = Console.ReadLine();
                switch (choose1)
                {
                    case "1": a.addOrder(); break;
                    case "2": a.removeOrder(); break;
                    case "3": Console.WriteLine("輸入1根據訂單金額查詢訂單，輸入2根據客戶名查詢訂單"); int i = Convert.ToInt32(Console.ReadLine()); a.searchOrder(i); break;
                    case "4": a.ShowOrder(); break;
                    case "5": a.order.Sort(); break;
                    case "6": a.export(); break;
                    case "7": a.import(); break;
                    case "8":judge_ = false;break;
                    default: Console.WriteLine("輸入錯誤"); break;
                }
            }
        }
    }
    [Serializable]
    public class AllOrder:IOrderService    //所有訂單
    {
        public List<Order> order = new List<Order>();
        
        public AllOrder()
        {
            
        }

        public void export()
        {
            XmlSerializer a = new XmlSerializer(typeof(List<Order>));
            using (FileStream b = new FileStream("order.xml", FileMode.Create))
            {
                a.Serialize(b, this.order);
            }
            Console.WriteLine("序列化完成");
        }

        public void import()
        {
            try
            {
                XmlSerializer a = new XmlSerializer(typeof(List<Order>));
                using (FileStream b = new FileStream("order.xml", FileMode.Open))
                {
                    List<Order> c = (List<Order>)a.Deserialize(b);
                    Console.WriteLine("反序列化結果：");
                    foreach (Order d in c)
                    {
                        Console.WriteLine("訂單號 客戶 日期 總金額");
                        Console.WriteLine("----------------------------");
                        Console.WriteLine("{0} {1} {2} {3}", d.Id, d.Customer, d.Date, d.Money);
                        d.showOrderItem();
                    }
                }
            }
            catch
            {
                Console.WriteLine("序列化系列操作錯誤");
            }
        }
        public void ShowOrder()
        {
            
            foreach (Order a in this.order) {
                Console.WriteLine("訂單號 客戶 日期 總金額");
                Console.WriteLine("----------------------------");
                Console.WriteLine("{0} {1} {2} {3}", a.Id,a.Customer,a.Date,a.Money);
                a.showOrderItem();
            }
        }
        public void addOrder()          //增加訂單
        {
            try
            {
                Console.WriteLine("請輸入訂單編號：");
                int id = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("請輸入客戶名稱：");
                string customer = Console.ReadLine();
                Console.WriteLine("請輸入時間：");
                string date = Console.ReadLine();
                Order a = new Order(id, customer, date);
                Console.WriteLine("輸入訂單項：");
                bool judge = true;
                bool same = false;
                foreach(Order m in this.order)
                {
                    if (m.Equals(a)) same = true;
                }
                if (same) Console.WriteLine("訂單號重復");
                else
                {
                    while (judge && !same)
                    {
                        Console.WriteLine("請輸入物品名稱：");
                        string name = Console.ReadLine();
                        Console.WriteLine("請輸入購買數量：");
                        int number = Convert.ToInt32(Console.ReadLine());
                        Console.WriteLine("請輸入單價：");
                        double price = Convert.ToDouble(Console.ReadLine());
                        a.addOrderItem(name, number, price);
                        Console.WriteLine("是否繼續添加訂單項：");
                        string x = Console.ReadLine();
                        if (x == "否") judge = false;
                        else if(x=="是") continue;
                        else if(x!="否"&&x!="是"){
                            Exception e = new Exception();
                            throw e;
                        }
                    }
                    order.Add(a);
                    a.getAllPrice();
                    Console.WriteLine("建立成功");
                    Console.WriteLine("-------------------------");
                }
            }
            catch
            {
                Console.WriteLine("輸入錯誤");
            }

        }
        public void removeOrder()           //刪除訂單
        {
            try
            {
                Console.WriteLine("輸入訂單號刪除訂單或相應明細：");
                int id = Convert.ToInt32(Console.ReadLine());
                int index = 0;
                foreach (Order a in this.order)
                {
                    if (a.Id == id) index = this.order.IndexOf(a);
                }
                Console.WriteLine("輸入1刪除訂單，輸入2繼續刪除訂單明細");
                int choose = Convert.ToInt32(Console.ReadLine());
                switch (choose)
                {
                    case 1: this.order.RemoveAt(index); Console.WriteLine("刪除成功"); Console.WriteLine("-----------------"); break;
                    case 2: this.order[index].showOrderItem(); this.order[index].RemoveOrderItem(); break;
                    default: Console.WriteLine("輸入錯誤"); break;
                }
            }
            catch
            {
                Console.WriteLine("輸入錯誤");
            }
            
        }

        public void searchOrder(int i)  //查詢訂單
        {
            try
            {
                switch (i)
                {
                    case 1:
                        int minNum, maxNum;
                        Console.WriteLine("輸入要查詢的最小金額：");
                        minNum = Convert.ToInt32(Console.ReadLine());
                        Console.WriteLine("輸入要查詢的最大金額：");
                        maxNum = Convert.ToInt32(Console.ReadLine());


                        var query1 = from s1 in order
                                     where maxNum > s1.Money
                                     orderby s1.Money
                                     select s1;
                        var query3 = from s3 in query1
                                     where s3.Money > minNum
                                     orderby s3.Money
                                     select s3;

                        List<Order> a1 = query3.ToList();

                        foreach (Order b1 in a1)
                        {
                            Console.WriteLine("訂單號 客戶 日期 總金額");
                            Console.WriteLine("----------------------------");
                            Console.WriteLine("{0} {1} {2} {3}", b1.Id, b1.Customer, b1.Date, b1.Money);
                            b1.showOrderItem();
                        }
                        break;
                    case 2:

                        Console.WriteLine("輸入客戶名稱：");
                        string name1 = Console.ReadLine();

                        var query2 = from s2 in order
                                     where s2.Customer == name1
                                     orderby s2.Money
                                     select s2;
                        List<Order> a2 = query2.ToList();

                        foreach (Order b2 in a2)
                        {
                            Console.WriteLine("訂單號 客戶 日期 總金額");
                            Console.WriteLine("----------------------------");
                            Console.WriteLine("{0} {1} {2} {3}", b2.Id, b2.Customer, b2.Date, b2.Money);
                            b2.showOrderItem();
                        }
                        break;
                    default: Console.WriteLine("輸入錯誤"); break;

                }
            }
            catch
            {
                Console.WriteLine("輸入錯誤");
            }
        }

        
    }
    [Serializable]
    public class Order:IComparable  //單個訂單項
    {
        public int Id { get; set; }
        public string Customer { get; set; }
        public double Money { get; set; }
        public string Date { get; set; }

        public List<OrderItem> orderItem = new List<OrderItem>();

        public Order()//無參構造函數
        {
            this.Id = 0;
            this.Customer = string.Empty;
            this.Money = 0;
            this.Date = string.Empty;
            
        }
        public int CompareTo(object obj)
        {
            Order a = obj as Order;
            return this.Id.CompareTo(a.Id);
        }
        public override bool Equals(object obj)
        {
            Order a = obj as Order;
            return this.Id == a.Id;
        }

        public override int GetHashCode()
        {
            return Convert.ToInt32(Id);
        }
        public Order(int id,string customer,string date)
        {
            this.Id = id;
            this.Customer = customer;
            this.Date = date;
        }
        public void getAllPrice()  //計算總價
        {
            double i=0;
            foreach(OrderItem a in this.orderItem)
            {
                i = i + a.getPrice();
            }
            this.Money = i;
            
            
        }

        public void addOrderItem(string name,int number,double price)   //添加訂單項
        { 
            OrderItem a = new OrderItem(name, number, price);
            this.orderItem.Add(a);
        }
        public void RemoveOrderItem() //刪除訂單項
        {
            try
            {
                Console.WriteLine("請輸入訂單明細序號刪除相應訂單明細：");
                int a = Convert.ToInt32(Console.ReadLine());
                this.orderItem.RemoveAt(a);
                Console.WriteLine("刪除成功");
                Console.WriteLine("-------------------------");
            }
            catch
            {
                Console.WriteLine("輸入序號錯誤");
            }
        }

        public void showOrderItem()  //展示訂單項
        {
            Console.WriteLine("序號 名稱 數量 單價");
            foreach (OrderItem a in this.orderItem)
            {
                
                Console.WriteLine("-----------------------");
                Console.WriteLine("{0} {1} {2} {3}",this.orderItem.IndexOf(a),a.Name,a.Number,a.Price);
            }
        }

    }
    [Serializable]
    public class OrderItem               //訂單明細項
    {
        private string name;
        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }
        private int number;
        public int Number
        {
            get
            {
                return number;
            }
            set
            {
                if (value >= 0) number = value;
                else Console.WriteLine("數量不應該小于0");
            }
        }
        private double price;
        public double Price
        {
            get
            {
                return price;
            }
            set
            {
                price = value;
            }
        }

        public OrderItem()//無參構造函數
        {
            this.Name = string.Empty;
            this.Number = 0;
            this.Price = 0;
        }

        public OrderItem(string name, int number, double price)
        {
            this.name = name;
            this.number = number;
            this.price = price;
        }
        public double getPrice()
        {
            return this.number * this.price;
        }

    }
    public interface IOrderService        //包含所有訂單功能的接口
    {
        void addOrder();
        void removeOrder();   
        void searchOrder(int i);
        void export();
        void import();

    }
}

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