Nu har det tillkommit en source med data för demo

Books.ConsoleApp/Books.cs

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+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Books.ConsoleApp
+{
+    public class BooksCollection
+    {
+        public Book[] Books { get; set; }
+    }
+
+    public class Book
+    {
+        public string[] categories;
+        public string author { get; set; }
+        public string country { get; set; }
+        public string imageLink { get; set; }
+        public string language { get; set; }
+        public string link { get; set; }
+        public int pages { get; set; }
+        public string title { get; set; }
+        public int year { get; set; }
+    }
+
+    public interface IBooksSource
+    {
+        Book[] Read();
+    }
+
+    public class BooksJsonSource : IBooksSource
+    {
+        private string booksJsonFile;
+
+        public BooksJsonSource(string booksFile = "books.json")
+        {
+            booksJsonFile = booksFile;
+        }
+
+        public Book[] Read()
+        {
+            var rawJsonBooks = File.ReadAllTextAsync(booksJsonFile)
+                // this (the .Result)is blocking the "UI"/"Main" thread - done for simplicity
+                // but utterly and very and fundamentaly wrong for production apps!
+                .Result;
+
+            return JsonConvert.DeserializeObject<Book[]>(rawJsonBooks);
+        }
+    }
+}