CSharp: Builder Pattern in donet 6 (C# 10）

 

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/// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public enum MeatType     {         Beef,         Pork,         Chicken,         Turkey,         Salami,     }       /// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public enum BreadType     {         White,         Wheat,         WholeGrain,         Rye,     }       /// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public enum CheeseType     {         Gouda,         Cheddar,         ParmigianoReggiano,         Camembert,         Pule,     }         /// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public abstract class SandwichBuilder     {           /// <summary>         ///         /// </summary>         protected Sandwich _sandwich = new();           /// <summary>         ///         /// </summary>         /// <returns>Sandwich.</returns>         public Sandwich GetSandwich() => _sandwich;         /// <summary>         ///         /// </summary>         public abstract void CreateNewSandwich();         /// <summary>         ///         /// </summary>         public abstract void PrepareBread();         /// <summary>         ///         /// </summary>         public abstract void ApplyMeatAndCheese();         /// <summary>         ///         /// </summary>         public abstract void ApplyVegetables();         /// <summary>         ///         /// </summary>         public abstract void AddCondiments();     }    /// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public class PremiumSandwichBuilder : SandwichBuilder     {           /// <summary>         ///         /// </summary>         public override void CreateNewSandwich() =>             _sandwich = new Sandwich("优质三明治");         /// <summary>         ///         /// </summary>         public override void AddCondiments()         {             _sandwich.HasMustard = true;             _sandwich.HasMayonnaise = true;             _sandwich.HasKetchup = true;         }         /// <summary>         ///         /// </summary>         public override void ApplyMeatAndCheese()         {             _sandwich.MeatType = MeatType.Beef;             _sandwich.CheeseType = CheeseType.Pule;         }         /// <summary>         ///         /// </summary>         public override void ApplyVegetables() =>             _sandwich.Vegetables = new List<string> { "西红柿","洋葱","生菜" };         /// <summary>         ///         /// </summary>         public override void PrepareBread() =>             _sandwich.BreadType = BreadType.WholeGrain;     }         /// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public class CheapSandwichBuilder : SandwichBuilder     {         /// <summary>         ///         /// </summary>         public override void CreateNewSandwich() =>             _sandwich = new Sandwich("廉价三明治");         /// <summary>         ///         /// </summary>         public override void AddCondiments() =>             _sandwich.HasMayonnaise = true;         /// <summary>         ///         /// </summary>         public override void ApplyMeatAndCheese()         {             _sandwich.MeatType = MeatType.Salami;             _sandwich.CheeseType = CheeseType.Cheddar;         }         /// <summary>         ///         /// </summary>         public override void ApplyVegetables() =>             _sandwich.Vegetables = new List<string> { "西红柿" };         /// <summary>         ///         /// </summary>         public override void PrepareBread() =>             _sandwich.BreadType = BreadType.White;     }      /// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public class Sandwich     {           /// <summary>         ///         /// </summary>         /// <param name="name"></param>         public Sandwich(string name)         {             Name = name;         }         /// <summary>         ///         /// </summary>         public Sandwich()         {             Name = "Unknown";         }         /// <summary>         ///         /// </summary>         public string Name { get; init; }         /// <summary>         ///         /// </summary>         public BreadType BreadType { get; set; }         /// <summary>         ///         /// </summary>         public CheeseType CheeseType { get; set; }         /// <summary>         ///         /// </summary>         public MeatType MeatType { get; set; }         /// <summary>         ///         /// </summary>         public bool IsToasted { get; set; }         /// <summary>         ///         /// </summary>         public bool HasMustard { get; set; }         /// <summary>         ///         /// </summary>         public bool HasMayonnaise { get; set; }         /// <summary>         ///         /// </summary>         public bool HasKetchup { get; set; }         /// <summary>         ///         /// </summary>         public List<string> Vegetables { get; set; } = new();         /// <summary>         ///         /// </summary>         public void Display()         {             Console.WriteLine();             Console.WriteLine(Name);             Console.WriteLine("----------------");               Console.WriteLine($"三明治夹 {BreadType} 面包");               if (IsToasted)             {                 Console.WriteLine("烤的");             }               if (HasMayonnaise)             {                 Console.WriteLine("用蛋黄酱");             }               if (HasMustard)             {                 Console.WriteLine("和芥末");             }               if (HasKetchup)             {                 Console.WriteLine("加蕃茄酱");             }               Console.WriteLine($"肉类: {MeatType}", MeatType);             Console.WriteLine($"奶酪: {CheeseType}", CheeseType);               Console.WriteLine($"蔬菜:");             foreach (var vegetable in Vegetables)             {                 Console.WriteLine($"   {vegetable}");             }         }     }    /// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public class SandwichDirector     {           /// <summary>         ///         /// </summary>         private SandwichBuilder _builder;         /// <summary>         ///         /// </summary>         /// <param name="builder"></param>         public SandwichDirector(SandwichBuilder builder)         {             _builder = builder;         }         /// <summary>         ///         /// </summary>         /// <param name="newBuilder"></param>         public void ChangeBuilder(SandwichBuilder newBuilder) =>             _builder = newBuilder;         /// <summary>         ///         /// </summary>         public void MakeSandwich()         {             _builder.CreateNewSandwich();             _builder.PrepareBread();             _builder.ApplyMeatAndCheese();             _builder.ApplyVegetables();             _builder.AddCondiments();         }         /// <summary>         ///         /// </summary>         /// <returns></returns>         public Sandwich GetSandwich() =>             _builder.GetSandwich();     }    /// <summary>     /// 生成器设计模式 Builder Pattern     /// </summary>     public static class DuBuilderExecutor     {           /// <summary>         ///         /// </summary>         //public override string Name => "生成器设计模式 Builder Pattern- Creational Pattern";         /// <summary>         ///         /// </summary>         public static void Execute()         {             var cheapSandwichBuilder = new CheapSandwichBuilder();             var premiumSandwichBuilder = new PremiumSandwichBuilder();               var director = new SandwichDirector(cheapSandwichBuilder);             MakeAndDisplaySandwich(director);               // This is not common to see, but it is possible to change builder if necessary.             director.ChangeBuilder(premiumSandwichBuilder);             MakeAndDisplaySandwich(director);         }         /// <summary>         ///         /// </summary>         /// <param name="director"></param>         private static void MakeAndDisplaySandwich(SandwichDirector director)         {             director.MakeSandwich();               var sandwich = director.GetSandwich();             sandwich.Display();         }     } }   using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Geovin.Du.BuildingBlocks;     namespace Geovin.Du.DuBuilder {         /// <summary>     /// 生成器模式 Builder Pattern     /// </summary>     public class Executor : PatternExecutor     {         /// <summary>         ///         /// </summary>         public override string Name => "生成器设计模式 Builder Pattern- Creational Pattern";         /// <summary>         /// 邮件执行         /// </summary>         public override void Execute()         {                 DuBuilderExecutor.Execute();           }       } }

　　

调用：

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1	Geovin.Du.DuBuilder.DuBuilderExecutor.Execute();

　　

输出：

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Hello, Geovin Du! 学习 .net 6   廉价三明治 ---------------- 三明治夹 White 面包 用蛋黄酱 肉类: Salami 奶酪: Cheddar 蔬菜:    西红柿   优质三明治 ---------------- 三明治夹 WholeGrain 面包 用蛋黄酱 和芥末 加蕃茄酱 肉类: Beef 奶酪: Pule 蔬菜:    西红柿    洋葱    生菜