/// <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：
Geovin.Du.DuBuilder.DuBuilderExecutor.Execute();
输出：
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