using CoreCourse.Csharpfeatures.Models;

using System;

using System.Collections.Generic;

​

namespace CoreCourse.Csharpfeatures

{

    class Program

    {

        static void Main(string[] args)

        {

            /*

            string info = "Account info: ";

            string name = "Carlton Banks ";

            string accountNumber = null;

            //string accountNumber = "16186";       

​

​

            info += name;

​

            //if (accountNumber == null) info += "<No account>";

            //else info += accountNumber;

​

            //De ?? checkt als het null is of niet. Zo ja dan zet hij "No account" anders de actie voor de ??

            info += accountNumber ?? "<No Account>";

​

            //info += name + (accountNumber ?? "<No Account>");    kan je ook doen als je bovenstaande info += name wegdoet

​

            Console.WriteLine(info);

            Console.ReadKey();

            */

​

            List<string> bookInfos = new List<string>();

            foreach(Book book in Book.GetAll())

            {

                string title = null, sequelTitle = null;

                int? pages = null;

​

                if(book != null)

                {

                    title = book.Title;

                    pages = book.Pages;

​

                    if(book.Sequel != null)

                    {

                        sequelTitle = book.Sequel.Title;

                    }

                }

​

                bookInfos.Add(string.Format("Title: {0}, Pages: {1}, Sequel: {2}", title, pages, sequelTitle));

            }

​

            PrintStrings(bookInfos);

            Console.ReadKey();

​

        }

​

        static void PrintStrings(IEnumerable<string> strings)

        {

            foreach(var s in strings)

            {

                Console.WriteLine(s);

            }

        }

    }

}