using System.Collections.ObjectModel; using EFLol; using (var context = new MyDbContext()) { // Clean the DB before starting Console.WriteLine("Clean the DB before starting"); context.Database.EnsureDeleted(); context.Database.EnsureCreated(); } SkinEntity black = new SkinEntity { Name = "Black", Description = "Black skin", Icon = "black.png", Price = 0.99f }; SkinEntity white = new SkinEntity { Name = "White", Description = "White skin", Icon = "white.png", Price = 150.99f }; SkinEntity green = new SkinEntity { Name = "Green", Description = "Green skin", Icon = "green.png", Price = 4.99f }; ChampionEntity Zeus = new ChampionEntity { Name = "Zeus", Bio = "Zeus is the god of the sky", Skins = new Collection(new List { black, white }) }; ChampionEntity Hera = new ChampionEntity { Name = "Hera", Bio = "Hera is the goddess of marriage", Skins = new Collection(new List { green }) }; ChampionEntity Poseidon = new ChampionEntity { Name = "Poseidon", Bio = "Poseidon is the god of the sea" }; using (var context = new MyDbContext()) { Console.WriteLine("Creates and inserts new Champions"); context.Add(Zeus); context.Add(Hera); context.Add(Poseidon); context.SaveChanges(); } using (var context = new MyDbContext()) { foreach (var n in context.Champions) { // LINQ to select the skins of the current champion var skins = context.Champions.Where(c => c.Id == n.Id).SelectMany(c => c.Skins); // Display the champion and its skins Console.WriteLine($"Champion n°{n.Id} - {n.Name} : {skins.Count()} skins"); } context.SaveChanges(); } using (var context = new MyDbContext()) { foreach (var n in context.Skins) { Console.WriteLine($"Skin n°{n.Id} - {n.Name}" + (n.Price != null ? $" - {n.Price}" : "")); } context.SaveChanges(); }