static void Main(string[] args) { var apple = new Product("Apple", Color.Green, Size.Small); var tree = new Product("Tree", Color.Green, Size.Large); var house = new Product("House", Color.Blue, Size.Large); Product[] products = { apple, tree, house }; var pf = new ProductFilter(); Console.WriteLine("Green products (old):"); foreach (var p in pf.FilterByColor(products, Color.Green)) { Console.WriteLine($" - {p.Name} is green"); } // ^^ BEFORE // vv AFTER var bf = new BetterFilter(); Console.WriteLine("Green products (new):"); foreach (var p in bf.Filter(products, new ColorSpecification(Color.Green))) { Console.WriteLine($" - {p.Name} is green"); } Console.WriteLine("Large products"); foreach (var p in bf.Filter(products, new SizeSpecification(Size.Large))) { Console.WriteLine($" - {p.Name} is large"); } Console.WriteLine("Large blue items"); foreach (var p in bf.Filter(products, new AndSpecification <Product>(new ColorSpecification(Color.Blue), new SizeSpecification(Size.Large))) ) { Console.WriteLine($" - {p.Name} is big and blue"); } }
static void Main(string[] args) { Product[] products = new Product[] { new Product("Apple", Color.Green, Size.Small), new Product("Tree", Color.Green, Size.Huge), new Product("House", Color.Blue, Size.Huge) }; var pf = new ProductFilter(); foreach (var p in pf.FilterByColor(products, Color.Green)) { Console.WriteLine($" - {p.Name} is green"); } var bf = new BetterFilter(); foreach (var p in bf.Filter(products, new ColorSpecificaiton(Color.Green))) { Console.WriteLine($" - {p.Name} is green"); } var bf2 = new BetterFilter(); foreach (var p in bf2.Filter(products, new AndSpecification <Product>(new ColorSpecificaiton(Color.Green), new SizeSpecification(Size.Huge)))) { Console.WriteLine($" - {p.Name} is green and huge"); } Console.ReadKey(); // Go to http://aka.ms/dotnet-get-started-console to continue learning how to build a console app! }