用C#写一个图书管理系统

好的，下面给出一个简单的图书管理系统的示例代码：

using System;
using System.Collections.Generic;

namespace LibraryManagementSystem
{
    class Book
    {
        public string Title { get; set; }
        public string Author { get; set; }
        public int Year { get; set; }
        public bool Available { get; set; }
    }

    class Library
    {
        private List<Book> books = new List<Book>();

        // 添加图书
        public void AddBook(Book book)
        {
            books.Add(book);
        }

        // 删除图书
        public void RemoveBook(Book book)
        {
            books.Remove(book);
        }

        // 展示所有图书
        public void ShowAllBooks()
        {
            Console.WriteLine("所有图书：");
            Console.WriteLine("书名\t\t作者\t\t出版年份\t是否可借");
            foreach (Book book in books)
            {
                Console.WriteLine("{0}\t\t{1}\t\t{2}\t\t{3}", book.Title, book.Author, book.Year, book.Available ? "是" : "否");
            }
        }

        // 按书名查找
        public void SearchByTitle(string title)
        {
            Console.WriteLine("搜索结果：");
            Console.WriteLine("书名\t\t作者\t\t出版年份\t是否可借");
            foreach (Book book in books)
            {
                if (book.Title == title)
                {
                    Console.WriteLine("{0}\t\t{1}\t\t{2}\t\t{3}", book.Title, book.Author, book.Year, book.Available ? "是" : "否");
                }
            }
        }

        // 按作者查找
        public void SearchByAuthor(string author)
        {
            Console.WriteLine("搜索结果：");
            Console.WriteLine("书名\t\t作者\t\t出版年份\t是否可借");
            foreach (Book book in books)
            {
                if (book.Author == author)
                {
                    Console.WriteLine("{0}\t\t{1}\t\t{2}\t\t{3}", book.Title, book.Author, book.Year, book.Available ? "是" : "否");
                }
            }
        }

        // 借书
        public void BorrowBook(string title)
        {
            foreach (Book book in books)
            {
                if (book.Title == title && book.Available)
                {
                    book.Available = false;
                    Console.WriteLine("借阅成功！");
                    return;
                }
            }
            Console.WriteLine("此书不可借或不存在！");
        }

        // 还书
        public void ReturnBook(string title)
        {
            foreach (Book book in books)
            {
                if (book.Title == title && !book.Available)
                {
                    book.Available = true;
                    Console.WriteLine("还书成功！");
                    return;
                }
            }
            Console.WriteLine("此书未被借出或不存在！");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Library library = new Library();

            // 添加几本图书
            library.AddBook(new Book { Title = "C#入门经典", Author = "Tom Archer", Year = 2010, Available = true });
            library.AddBook(new Book { Title = "Java编程思想", Author = "Bruce Eckel", Year = 2006, Available = false });
            library.AddBook(new Book { Title = "Python基础教程", Author = "Magnus Lie Hetland", Year = 2013, Available = true });
            library.AddBook(new Book { Title = "C++ Primer Plus", Author = "Stephen Prata", Year = 2011, Available = true });

            // 展示所有图书
            library.ShowAllBooks();

            // 搜索图书
            Console.WriteLine("按书名搜索：");
            library.SearchByTitle("Java编程思想");
            Console.WriteLine("按作者搜索：");
            library.SearchByAuthor("Tom Archer");

            // 借阅图书
            Console.WriteLine("借阅图书：");
            library.BorrowBook("Java编程思想");

            // 展示所有图书
            library.ShowAllBooks();

            // 还书
            Console.WriteLine("还书：");
            library.ReturnBook("Java编程思想");

            // 展示所有图书
            library.ShowAllBooks();

            Console.ReadKey();
        }
    }
}

这个图书管理系统包含了添加、删除、展示、搜索、借阅和还书等功能。用户可以通过命令行界面进行操作。