C#如何实现简单订单管理程序

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订单管理的控制台程序，能够实现添加订单、删除订单、修改订单、查询订单、序列化与反序列化订单功能。

主要的类有Order（订单）、OrderItem（订单明细项），OrderService（订单服务），订单数据可以保存在OrderService中一个List中。在Program里面可以调用OrderService的方法完成各种订单操作。

要求：

（1）使用LINQ语言实现各种查询功能，查询结果按照订单总金额排序返回。
（2）在订单删除、修改失败时，能够产生异常并显示给客户错误信息。
（3）作业的订单和订单明细类需要重写Equals方法，确保添加的订单不重复，每个订单的订单明细不重 复。
（4）订单、订单明细、客户、货物等类添加ToString方法，用来显示订单信息。
（5）OrderService提供排序方法对保存的订单进行排序。默认按照订单号排序，也可以使用Lambda表达式进行自定义排序。
（6）在OrderService中添加一个Export方法，可以将所有的订单序列化为XML文件；添加一个Import方法可以从XML文件中载入订单。

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("输入1增加订单，输入2删除订单，输入3查询订单，输入4显示所有订单，输入5根据订单号为订单排序,输入6序列化订单，输入7反序列化订单，输入8退出");                string choose1 = Console.ReadLine();                switch (choose1)                {                    case "1": a.addOrder(); break;                    case "2": a.removeOrder(); break;                    case "3": Console.WriteLine("输入1根据订单金额查询订单，输入2根据客户名查询订单"); 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("输入错误"); break;                }            }        }    }    [Serializable]    public class AllOrder:IOrderService    //所有订单    {        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("反序列化结果：");                    foreach (Order d in c)                    {                        Console.WriteLine("订单号 客户 日期 总金额");                        Console.WriteLine("----------------------------");                        Console.WriteLine("{0} {1} {2} {3}", d.Id, d.Customer, d.Date, d.Money);                        d.showOrderItem();                    }                }            }            catch            {                Console.WriteLine("序列化系列操作错误");            }        }        public void ShowOrder()        {                        foreach (Order a in this.order) {                Console.WriteLine("订单号 客户 日期 总金额");                Console.WriteLine("----------------------------");                Console.WriteLine("{0} {1} {2} {3}", a.Id,a.Customer,a.Date,a.Money);                a.showOrderItem();            }        }        public void addOrder()          //增加订单        {            try            {                Console.WriteLine("请输入订单编号：");                int id = Convert.ToInt32(Console.ReadLine());                Console.WriteLine("请输入客户名称：");                string customer = Console.ReadLine();                Console.WriteLine("请输入时间：");                string date = Console.ReadLine();                Order a = new Order(id, customer, date);                Console.WriteLine("输入订单项：");                bool judge = true;                bool same = false;                foreach(Order m in this.order)                {                    if (m.Equals(a)) same = true;                }                if (same) Console.WriteLine("订单号重复");                else                {                    while (judge && !same)                    {                        Console.WriteLine("请输入物品名称：");                        string name = Console.ReadLine();                        Console.WriteLine("请输入购买数量：");                        int number = Convert.ToInt32(Console.ReadLine());                        Console.WriteLine("请输入单价：");                        double price = Convert.ToDouble(Console.ReadLine());                        a.addOrderItem(name, number, price);                        Console.WriteLine("是否继续添加订单项：");                        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("输入错误");            }        }        public void removeOrder()           //删除订单        {            try            {                Console.WriteLine("输入订单号删除订单或相应明细：");                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("输入1删除订单，输入2继续删除订单明细");                int choose = Convert.ToInt32(Console.ReadLine());                switch (choose)                {                    case 1: this.order.RemoveAt(index); Console.WriteLine("删除成功"); Console.WriteLine("-----------------"); break;                    case 2: this.order[index].showOrderItem(); this.order[index].RemoveOrderItem(); break;                    default: Console.WriteLine("输入错误"); break;                }            }            catch            {                Console.WriteLine("输入错误");            }                    }        public void searchOrder(int i)  //查询订单        {            try            {                switch (i)                {                    case 1:                        int minNum, maxNum;                        Console.WriteLine("输入要查询的最小金额：");                        minNum = Convert.ToInt32(Console.ReadLine());                        Console.WriteLine("输入要查询的最大金额：");                        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("订单号 客户 日期 总金额");                            Console.WriteLine("----------------------------");                            Console.WriteLine("{0} {1} {2} {3}", b1.Id, b1.Customer, b1.Date, b1.Money);                            b1.showOrderItem();                        }                        break;                    case 2:                        Console.WriteLine("输入客户名称：");                        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("订单号 客户 日期 总金额");                            Console.WriteLine("----------------------------");                            Console.WriteLine("{0} {1} {2} {3}", b2.Id, b2.Customer, b2.Date, b2.Money);                            b2.showOrderItem();                        }                        break;                    default: Console.WriteLine("输入错误"); break;                }            }            catch            {                Console.WriteLine("输入错误");            }        }            }    [Serializable]    public class Order:IComparable  //单个订单项    {        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()//无参构造函数        {            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()  //计算总价        {            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)   //添加订单项        {             OrderItem a = new OrderItem(name, number, price);            this.orderItem.Add(a);        }        public void RemoveOrderItem() //删除订单项        {            try            {                Console.WriteLine("请输入订单明细序号删除相应订单明细：");                int a = Convert.ToInt32(Console.ReadLine());                this.orderItem.RemoveAt(a);                Console.WriteLine("删除成功");                Console.WriteLine("-------------------------");            }            catch            {                Console.WriteLine("输入序号错误");            }        }        public void showOrderItem()  //展示订单项        {            Console.WriteLine("序号 名称 数量 单价");            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               //订单明细项    {        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("数量不应该小于0");            }        }        private double price;        public double Price        {            get            {                return price;            }            set            {                price = value;            }        }        public OrderItem()//无参构造函数        {            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        //包含所有订单功能的接口    {        void addOrder();        void removeOrder();           void searchOrder(int i);        void export();        void import();    }}

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