CSharp: Factory Method Pattern in donet 6

 

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/// <summary>  /// The Product declares the interface, which is common to all objects  /// that can be produced by the creator <see cref="Restaurants.Common.Restaurant"/> and its subclasses.  /// 工厂方法模式 Factory Method - Creational Pattern  /// </summary>  public interface IMeal  {        /// <summary>      ///      /// </summary>      void ShowDescription();  }    /// <summary>  /// The Creator class declares the factory method that returns new product objects.  /// 工厂方法模式 Factory Method - Creational Pattern  /// </summary>  public abstract class Restaurant  {      /// <summary>      /// The factory method that returns new product objects.      /// It’s important that the return type of this method matches the product interface.      /// You can declare the factory method as abstract to force all subclasses to implement their own versions of the method.      /// As an alternative, the base factory method can return some default product type.      /// </summary>      /// <returns>Meal.</returns>      public abstract IMeal PrepareMainCourse();        /// <summary>      /// Note, despite its name, product creation is not the primary responsibility of the creator.      /// Usually, the creator class already has some core business logic related to products.      /// The factory method helps to decouple this logic using the concrete product classes.      /// </summary>      public void OrderDailySpecial()      {          Console.WriteLine("Geovin Du 要饮料:苏打水");            var mainCourse = PrepareMainCourse();          mainCourse.ShowDescription();      }  }   /// <summary>  /// Concrete products are different implementations of the product interface <see cref="IMeal"/>.  /// </summary>  public class GreenSalad : IMeal  {        /// <summary>      ///      /// </summary>      public void ShowDescription()      {          Console.WriteLine("涂聚文叫单：蔬菜沙拉——有生菜、黄瓜和青橄榄");      }  }    /// <summary>  /// Concrete products are different implementations of the product interface <see cref="IMeal"/>.  /// </summary>  public class Hamburger : IMeal  {        /// <summary>      ///      /// </summary>      public void ShowDescription()      {          Console.WriteLine("Geovin Du叫单：汉堡-加牛肉，伍斯特沙司和奶酪。再来一份中餐：鸳鸯火锅.");      }  }   /// <summary>  /// Concrete creators override the base factory method so it returns a different type of product.  /// 工厂方法模式 Factory Method - Creational Pattern  /// </summary>  public class VegetarianRestaurant : Restaurant  {        /// <summary>      ///      /// </summary>      /// <returns></returns>      public override IMeal PrepareMainCourse()      {          return new GreenSalad();      }  }    /// <summary>  /// Concrete creators override the base factory method so it returns a different type of product.  /// 工厂方法模式 Factory Method - Creational Pattern  /// </summary>  public class FastFoodRestaurant : Restaurant  {        /// <summary>      ///      /// </summary>      /// <returns></returns>      public override IMeal PrepareMainCourse()      {          return new Hamburger();      }  }    /// <summary>  /// 工厂方法模式 Factory Method - Creational Pattern  ///  /// </summary>  public class Executor : PatternExecutor  {        /// <summary>      ///      /// </summary>      public override string Name => "工厂方法模式 Factory Method - Creational Pattern";      /// <summary>      ///      /// </summary>      public override void Execute()      {          Restaurant restaurant = InitializeRestaurant();            restaurant.OrderDailySpecial();      }      /// <summary>      ///      /// </summary>      /// <returns></returns>      private Restaurant InitializeRestaurant()      {          // This is usually stored within some configuration          var choosenType = typeof(FastFoodRestaurant).FullName;          choosenType = typeof(VegetarianRestaurant).FullName;          return Assembly.GetExecutingAssembly().CreateInstance(choosenType) as Restaurant;      }  }

　　

调用：

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Console.WriteLine("Hello, Geovin Du! 学习 .net 6 "); //Geovin.Du.DuEmail.EmailExecutor.Execute(); //Geovin.Du.DuStock.StockExecutor.Execute(); // Geovin.Du.DuShoppingCart.ShoppingCartExecutor.Execute(); //Geovin.Du.DuNullObject.SmartphoneApplicationExecutor.Execute();   Geovin.Du.DuFactoryMethod.Executor ex = new Geovin.Du.DuFactoryMethod.Executor(); ex.Execute();

　　

输出：

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Hello, Geovin Du! 学习 .net 6 Geovin Du 要饮料:苏打水 涂聚文叫单：蔬菜沙拉——有生菜、黄瓜和青橄榄