Ch4PizzaStore: first version

Ch4PizzaStore/Ch4PizzaStore.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <LangVersion>latestmajor</LangVersion>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

Ch4PizzaStore/Pizza.cs

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+namespace Ch4PizzaStore;
+
+public abstract class Pizza(string name, string dough, string sauce, List<string> toppings) {
+    public string Name { get; } = name;
+
+    internal void Prepare() {
+        Console.WriteLine($"Preparing {Name}");
+        Console.WriteLine($"Tossing {dough} dough...");
+        Console.WriteLine($"Adding {sauce} sauce...");
+        Console.WriteLine("Adding toppings:");
+        foreach (var topping in toppings) {
+            Console.WriteLine($"\t{topping}");
+        }
+    }
+
+    // While in Java all methods are by default `virtual`, C# is the same as C++,
+    // all methods are final/selaed until explicitly marked as virtual.
+    internal virtual void Bake() {
+        Console.WriteLine("Bake for 25 minutes at 350");
+    }
+
+    internal virtual void Cut() {
+        Console.WriteLine("Cutting the pizza into diagonal slices");
+    }
+
+    internal virtual void Box() {
+        Console.WriteLine("Place pizza in official PizzaStore box");
+    }
+}
+
+public class NYStyleCheesePizza() : Pizza("NY Style Sauce and Cheese Pizza", "Thin Crust Dough", "Marinara Sauce",
+    ["Grated Reggiano Cheese"]);
+
+public class ChicagoStyleCheesePizza() : Pizza("Chicago Style Deep Dish Cheese Pizza", "Extra Thick Crust Dough",
+    "Plum Tomato Sauce", ["Shredded Mozzarella Cheese"]) {
+    internal override void Cut() {
+        Console.WriteLine("Cutting the pizza into square slices");
+    }
+}
+
+public abstract class PizzaStore {
+    protected abstract Pizza CreatePizza(string type);
+
+    public Pizza OrderPizza(string type) {
+        var pizza = CreatePizza(type);
+        pizza.Prepare();
+        pizza.Bake();
+        pizza.Cut();
+        pizza.Box();
+        return pizza;
+    }
+}
+
+public class NYPizzaStore : PizzaStore {
+    protected override Pizza CreatePizza(string type) {
+        return type switch {
+            "cheese" => new NYStyleCheesePizza(),
+            _ => throw new ArgumentOutOfRangeException(nameof(type), type, null)
+        };
+    }
+}
+
+public class ChicagoPizzaStore : PizzaStore {
+    protected override Pizza CreatePizza(string type) {
+        return type switch {
+            "cheese" => new ChicagoStyleCheesePizza(),
+            _ => throw new ArgumentOutOfRangeException(nameof(type), type, null)
+        };
+    }
+}

Ch4PizzaStore/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using Ch4PizzaStore;
+
+PizzaStore nyStore = new NYPizzaStore();
+PizzaStore chicagoStore = new ChicagoPizzaStore();
+
+var pizza = nyStore.OrderPizza("cheese");
+Console.WriteLine($"Ethan ordered a {pizza.Name}\n");
+pizza = chicagoStore.OrderPizza("cheese");
+Console.WriteLine($"Joel ordered a {pizza.Name}\n");