Library

using System;
using System.Collections.Generic;

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

            while (isWork)
            {
                Console.WriteLine("1.Добавить книгу.\n2.Убрать книгу.\n3.Показать все книги.\n4.Показать книгу по параметру.\n5.Выйти.");
                switch (Console.ReadLine())
                {
                    case "1":
                        library.AddBook();
                        break;
                    case "2":
                        library.DeleteBook();
                        break;
                    case "3":
                        library.ShowAllBooks();
                        break;
                    case "4":
                        library.SelectOption();
                        break;
                    case "5":
                        isWork = false;
                        break;
                }
                Console.WriteLine("\nЧтобы продолжить нажмите любую кнопку");
                Console.ReadLine();
                Console.Clear();
            }
        }
    }

    class Library
    {
        private List<Books> _book = new List<Books>();

        public void AddBook()
        {
            Console.WriteLine("Введите Название книги: ");
            string title = Console.ReadLine();
            Console.WriteLine("Введите Автора книги: ");
            string autor = Console.ReadLine();
            Console.WriteLine("Введите Жанр книги: ");
            string genre = Console.ReadLine();
            Console.WriteLine("Введите Год книги: ");
            int year;
            if (int.TryParse(Console.ReadLine(), out year) == true)
                _book.Add(new Books(title, autor, genre, year));
        }

        public void ShowAllBooks()
        {
            for (int i = 0; i < _book.Count; i++)
            {
                ShowInfo(i);
            }
        }

        public void DeleteBook()
        {
            for (int i = 0; i < _book.Count; i++)
            {
                Console.WriteLine($"Номер книги: {_book[i].Number}.\nИмя: {_book[i].Title}.\n");
            }

            Console.Write("Введите номер книги: ");
            int number;
            if (int.TryParse(Console.ReadLine(), out number) == true && number < _book.Count && number >= 0)
                _book.RemoveAt(number - 1);
        }

        public void SelectOption()
        {
            Console.WriteLine("Выбирите параметр.");
            Console.WriteLine("1.Название.\n2.Автор.\n3.Жанр.\nГод.");

            switch (Console.ReadLine())
            {
                case "1":
                    NameSearch();
                    break;
                case "2":
                    SearchAuthor();
                    break;
                case "3":
                    SearchGenre();
                    break;
                case "4":
                    SearchYear();
                    break;
            }
        }

        private void NameSearch()
        {
            string title = Console.ReadLine();
            for (int i = 0; i < _book.Count; i++)
            {
                if (title == _book[i].Title)
                {
                    ShowInfo(i);
                }
            }
        }

        private void SearchAuthor()
        {
            string autor = Console.ReadLine();
            for (int i = 0; i < _book.Count; i++)
            {
                if (autor == _book[i].Author)
                {
                    ShowInfo(i);
                }
            }
        }

        private void SearchGenre()
        {
            string genre = Console.ReadLine();
            for (int i = 0; i < _book.Count; i++)
            {
                if (genre == _book[i].Genre)
                {
                    ShowInfo(i);
                }
            }
        }

        private void SearchYear()
        {
            int year;
            if (int.TryParse(Console.ReadLine(), out year) == true)
                for (int i = 0; i < _book.Count; i++)
                {
                    if (year == _book[i].Year)
                    {
                        ShowInfo(i);
                    }
                }
        }

        private void ShowInfo(int number)
        {
            Console.WriteLine($"Номер книги: {_book[number].Number}.\nИмя: {_book[number].Title}.\nАвтор: {_book[number].Author}.\nЖанр: {_book[number].Genre}.\nГод: {_book[number].Year}.\n");
        }
    }

    class Books
    {
        private static int _number = 0;
        public int Number { get; private set; }
        public string Title { get; private set; }
        public string Author { get; private set; }
        public string Genre { get; private set; }
        public int Year { get; private set; }

        public Books(string title, string autor, string genre, int year)
        {
            _number++;
            Number = _number;
            Title = title;
            Author = autor;
            Genre = genre;
            Year = year;
        }
    }
}