rfid图书借阅系统C#

以下是一个简单的RFID图书借阅系统的C#代码示例：

using System;
using System.Collections.Generic;

namespace RFIDLibrarySystem
{
    class Program
    {
        static void Main(string[] args)
        {
            // 初始化图书列表和用户列表
            List<Book> books = new List<Book>();
            List<User> users = new List<User>();

            // 添加图书和用户
            books.Add(new Book("001", "C# Programming", "John Smith"));
            books.Add(new Book("002", "Java Programming", "Jane Doe"));
            users.Add(new User("001", "Alice"));
            users.Add(new User("002", "Bob"));

            // 初始化RFID卡
            RFIDCard userCard = new RFIDCard("001");
            RFIDCard bookCard = new RFIDCard("002");

            // 用户借书
            User user = users[0];
            Book book = books[0];
            user.BorrowBook(book, userCard, bookCard);

            // 用户还书
            user.ReturnBook(book, userCard, bookCard);
        }
    }

    // 图书类
    class Book
    {
        public string Id { get; set; }
        public string Name { get; set; }
        public string Author { get; set; }

        public Book(string id, string name, string author)
        {
            Id = id;
            Name = name;
            Author = author;
        }
    }

    // 用户类
    class User
    {
        public string Id { get; set; }
        public string Name { get; set; }
        public List<Book> BorrowedBooks { get; set; }

        public User(string id, string name)
        {
            Id = id;
            Name = name;
            BorrowedBooks = new List<Book>();
        }

        // 借书
        public void BorrowBook(Book book, RFIDCard userCard, RFIDCard bookCard)
        {
            if (book != null && userCard != null && bookCard != null)
            {
                // 检查图书是否已被借出
                if (bookCard.IsAvailable())
                {
                    // 借书
                    BorrowedBooks.Add(book);
                    bookCard.SetUser(userCard);
                    Console.WriteLine(Name + " borrowed " + book.Name);
                }
                else
                {
                    Console.WriteLine("The book is not available.");
                }
            }
        }

        // 还书
        public void ReturnBook(Book book, RFIDCard userCard, RFIDCard bookCard)
        {
            if (book != null && userCard != null && bookCard != null)
            {
                // 检查用户是否借了这本书
                if (BorrowedBooks.Contains(book))
                {
                    // 还书
                    BorrowedBooks.Remove(book);
                    bookCard.ClearUser();
                    Console.WriteLine(Name + " returned " + book.Name);
                }
                else
                {
                    Console.WriteLine("You did not borrow this book.");
                }
            }
        }
    }

    // RFID卡类
    class RFIDCard
    {
        public string Id { get; set; }
        public User User { get; set; }

        public RFIDCard(string id)
        {
            Id = id;
        }

        // 设置用户
        public void SetUser(RFIDCard userCard)
        {
            if (userCard != null)
            {
                User = userCard.User;
            }
        }

        // 清除用户
        public void ClearUser()
        {
            User = null;
        }

        // 检查卡是否可用
        public bool IsAvailable()
        {
            return User == null;
        }
    }
}