CSharp: Composite Pattern in donet 6

 

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/// <summary>     /// 组合模式 Composite Pattern 亦称： 对象树、Object Tree、Composite Pattern     /// </summary>     public abstract class Gift     {           /// <summary>         ///         /// </summary>         protected readonly string _description;         /// <summary>         ///         /// </summary>         protected decimal _price;         /// <summary>         ///         /// </summary>         /// <param name="description"></param>         /// <param name="price"></param>         protected Gift(string description, decimal price)         {             _description = description;             _price = price;         }         /// <summary>         ///         /// </summary>         /// <returns></returns>         public abstract decimal CalculatePrice();     }        /// <summary>     /// 组合模式 Composite Pattern 亦称： 对象树、Object Tree、Composite Pattern     /// </summary>     public interface IGiftOperations     {           /// <summary>         ///         /// </summary>         /// <param name="gift"></param>         void Add(Gift gift);         /// <summary>         ///         /// </summary>         /// <param name="gift"></param>         void Remove(Gift gift);     }    /// <summary>     /// 组合模式 Composite Pattern 亦称： 对象树、Object Tree、Composite Pattern     /// </summary>     public class CompositeGift : Gift, IGiftOperations     {         /// <summary>         /// This collection can store simple as well as composite gifts.         /// </summary>         private readonly List<Gift> _gifts;         /// <summary>         ///         /// </summary>         /// <param name="description"></param>         public CompositeGift(string description)             : base(description, 0)         {             _gifts = new List<Gift>();         }         /// <summary>         ///         /// </summary>         /// <param name="gift"></param>         public void Add(Gift gift) =>             _gifts.Add(gift);         /// <summary>         ///         /// </summary>         /// <param name="gift"></param>         public void Remove(Gift gift) =>             // Consider using HashSet or Dictionary if you need remove an item from a collection.             _gifts.Remove(gift);         /// <summary>         ///         /// </summary>         /// <returns></returns>         public override decimal CalculatePrice()         {             Console.WriteLine($"'{_description}' 包含以下产品及价格:");             _price = _gifts.Sum(gift => gift.CalculatePrice());               return _price;         }     }     /// <summary>     /// 组合模式 Composite Pattern 亦称： 对象树、Object Tree、Composite Pattern     /// </summary>     public class SimpleGift : Gift     {           /// <summary>         ///         /// </summary>         /// <param name="description"></param>         /// <param name="price"></param>         public SimpleGift(string description, decimal price)             : base(description, price)         {         }         /// <summary>         ///         /// </summary>         /// <returns></returns>         public override decimal CalculatePrice()         {             Console.WriteLine($"'{_description}' with the price of {_price:C}");             return _price;         }     }      /// <summary>     ///  组合模式 Composite Pattern 亦称： 对象树、Object Tree、Composite Pattern     /// </summary>     public static class GiftExecutor     {           /// <summary>         /// /         /// </summary>         public static void Execute()         {             ConsoleExtension.WriteSeparator("组合模式 Composite Pattern:  Gift demo");               var smartWatchGift = new SimpleGift("智能手表 Smart watch", 200);             var smartWatchPrice = smartWatchGift.CalculatePrice();             Console.WriteLine($"智能手表礼品总价: {smartWatchPrice:C}");               Console.WriteLine();               var familyGift = new CompositeGift("家庭的礼物");             var dadsGift = new SimpleGift("钓鱼竿Fishing rod", 50);             var momsGift = new SimpleGift("项链Necklace", 80);             var childrenGift = new CompositeGift("孩子们的礼物Children gift");             childrenGift.Add(new SimpleGift("士兵玩具Soldier toy", 40));             childrenGift.Add(new SimpleGift("芭比玩具Barbie toy", 50));               familyGift.Add(dadsGift);             familyGift.Add(momsGift);             familyGift.Add(childrenGift);               var familyGiftPrice = familyGift.CalculatePrice();             Console.WriteLine($"家庭礼物总价: {familyGiftPrice:C}");         }     }

　　调用：、

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1 2	Geovin.Du.DuComposite.DuGift.GiftExecutor.Execute(); Console.WriteLine();

　　

输出：

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组合模式 Composite Pattern:  Gift demo -------------------------------------------------- '智能手表 Smart watch' with the price of ￥200.00 智能手表礼品总价: ￥200.00   '家庭的礼物' 包含以下产品及价格:: '钓鱼竿Fishing rod' with the price of ￥50.00 '项链Necklace' with the price of ￥80.00 '孩子们的礼物Children gift' 包含以下产品及价格:: '士兵玩具Soldier toy' with the price of ￥40.00 '芭比玩具Barbie toy' with the price of ￥50.00 家庭礼物总价: ￥220.00