ДЗ: Хранилище книг

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Reflection;

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

        library.Work();

        Console.WriteLine("Программа завершена.");
        Console.ReadKey();
    }
}

class Book
{
    public Book(string name, int releaseDate, string author)
    {
        Name = name;
        ReleaseDate = releaseDate;
        Author = author;
    }

    public string Name { get; private set; }
    public int ReleaseDate { get; private set; }
    public string Author { get; private set; }

    public void ShowInfo()
    {
        Console.WriteLine($"Книга: {Name}. Автор: {Author}. Год издания: {ReleaseDate}.");
    }
}

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

    public Library()
    {
        _books.Add(new Book("Война и мир", 1869, "Толстой"));
        _books.Add(new Book("Преступление и наказание", 1866, "Достоевский"));
        _books.Add(new Book("Мастер и Маргарита", 1967, "Булгаков"));
        _books.Add(new Book("Анна Каренина", 1877, "Толстой"));
        _books.Add(new Book("Евгений Онегин", 1833, "Пушкин"));
    }

    public void Work()
    {
        const string CommandExit = "Exit";
        const string CommandShowAllBooks = "1";
        const string CommandAddBook = "2";
        const string CommandRemoveBook = "3";
        const string CommandSearchBook = "4";

        bool isRun = true;

        while (isRun)
        {
            Console.Clear();
            Console.WriteLine($"{CommandShowAllBooks} - Показать все книги." +
                $"\n{CommandAddBook} - Добавить книгу." +
                $"\n{CommandRemoveBook} - Убрать книгу." +
                $"\n{CommandSearchBook} - Найти книгу." +
                $"\n{CommandExit} - Завершить программу.");

            switch (Console.ReadLine())
            {
                case CommandShowAllBooks:
                    ShowBooks(_books);
                    break;

                case CommandAddBook:
                    AddBook();
                    break;

                case CommandRemoveBook:
                    RemoveBook();
                    break;

                case CommandSearchBook:
                    SearchBooks();
                    break;

                case CommandExit:
                    isRun = false;
                    break;

                default:
                    Console.WriteLine("Ошибка ввода.");
                    break;
            }
        }
    }

    private void AddBook()
    {
        Console.Write("Название книги: ");
        string name = Console.ReadLine();
        Console.Write("Год издания: ");
        int releaseDate = ReadInt();
        Console.Write("Автор книги: ");
        string author = Console.ReadLine();

        _books.Add(new Book(name, releaseDate, author));

        Console.WriteLine("Книга добавлена.");
        Console.ReadKey();
    }

    private void RemoveBook()
    {
        for (int i = 0;  i < _books.Count; i++)
        {
            Console.Write(i + 1 + ". ");
            _books[i].ShowInfo();
        }

        Console.Write("Введите номер книги: ");
        int numberBook = ReadInt();

        if (numberBook > 0 && numberBook <= _books.Count)
        {
            Console.WriteLine("Книга убрана.");

            _books.RemoveAt(numberBook - 1);
        }
        else
        {
            Console.WriteLine("Нет такой книги.");
        }

        Console.ReadKey();
    }

    private void SearchBooks()
    {
        string commandSearchBooksByName = "1";
        string commandSearchBooksByReleaseDate = "2";
        string commandSearchBooksByAuthor = "3";

        Console.WriteLine($"{commandSearchBooksByName} - Поиск по названию.\n" +
            $"{commandSearchBooksByReleaseDate} - Поиск по году издания.\n" +
            $"{commandSearchBooksByAuthor} - Поиск по автору.");

        string userInput = Console.ReadLine();

        if (userInput == commandSearchBooksByName)
        {
            ShowBooks(FindBooksByName());
        }
        else if (userInput == commandSearchBooksByReleaseDate)
        {
            ShowBooks(FindBooksByReleaseDate());
        }
        else if (userInput == commandSearchBooksByAuthor)
        {
            ShowBooks(FindBooksByAuthor());
        }
        else
        {
            Console.WriteLine("Ошибка ввода.");
        }

        Console.ReadKey();
    }

    private int ReadInt()
    {
        int number;

        while (int.TryParse(Console.ReadLine(), out number) == false)
        {
            Console.Write("Ошибка ввода. Повторите: ");
        }

        return number;
    }

    private List<Book> FindBooksByName()
    {
        List<Book> result = new List<Book>();

        Console.Write("Введи название книги: ");
        string name = Console.ReadLine();

        foreach (Book book in _books)
        {
            if (book.Name.Equals(name, StringComparison.OrdinalIgnoreCase))
            {
                result.Add(book);
            }
        }

        return result;
    }

    private List<Book> FindBooksByAuthor()
    {
        List<Book> result = new List<Book>();

        Console.Write("Введи автора: ");
        string author = Console.ReadLine();

        foreach (Book book in _books)
        {
            if (book.Author.Equals(author, StringComparison.OrdinalIgnoreCase))
            {
                result.Add(book);
            }
        }

        return result;
    }

    private List<Book> FindBooksByReleaseDate()
    {
        List<Book> result = new List<Book>();

        Console.Write("Введи год издания: ");
        int year = ReadInt();

        foreach (Book book in _books)
        {
            if (book.ReleaseDate == year)
            {
                result.Add(book);
            }
        }

        return result;
    }

    private void ShowBooks(List<Book> books)
    {
        if (books.Count != 0)
        {
            foreach (Book book in books)
            {
                book.ShowInfo();
            }
        }
        else
        {
            Console.WriteLine("Книг нет.");
        }

        Console.ReadKey();
    }
}