BookLibrary.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Program
{
    public class BookLibrary
    {
        private string name;
        private List<Book> books;

        public BookLibrary(string name)
        {
            Name = name;
            Books = new List<Book>();
        }

        public string Name
        {
            get
            {
                return name;
            }

            set
            {
                name = value;
            }
        }

        public List<Book> Books
        {
            get
            {
                return books;
            }

            set
            {
               books = value;
            }
        }

        public void AddBook(string title, double rating)
        {
            Book book = new Book(title, rating);
            this.books.Add(book);
        }

        public double AverageRating()
        {
            List<double> ratings = new List<double>();
            foreach (Book book in books)
            {
                ratings.Add(book.Rating);
            }

            return ratings.Average();
        }

        public List<string> GetBooksByRating(double rating)
        {
            List<string> bestBooks = new List<string>();
            foreach (Book book in books)
            {
                if (book.Rating > rating)
                {
                    bestBooks.Add(book.Title);
                }
            }
            return bestBooks;
        }

        public List<Book> SortByTitle()
        {
            books = books.OrderBy(book => book.Title).ToList();
            return books;
        }

        public List<Book> SortByRating()
        {

            books = books.OrderByDescending(book => book.Rating).ToList();
            return books;
        }

        public string[] ProvideInformationAboutAllBooks()
        {
            List<string> infoList = new List<string>();
            foreach (Book book in books)
            {
                infoList.Add(book.ToString());
            }
            return infoList.ToArray();
        }

        public bool CheckBookIsInBookLibrary(string title)
        {
            foreach (Book book in books)
            {
                if (book.Title == title)
                {
                    return true;
                }
            }

            return false;
        }
    }
}