C# 当我在中产阶级中使用抽象关键字时,代码不起作用
我有以下代码,运行良好:C# 当我在中产阶级中使用抽象关键字时,代码不起作用,c#,design-patterns,abstract-class,C#,Design Patterns,Abstract Class,我有以下代码,运行良好: public abstract class Beverage { public string description = "Unknown beverage"; public virtual string getDescription() { return description; } public abstract double cost(); } public abstract class condim
public abstract class Beverage
{
public string description = "Unknown beverage";
public virtual string getDescription()
{
return description;
}
public abstract double cost();
}
public abstract class condimentDecorator : Beverage
{
// public abstract string getDescription();
}
public class DarkRoast : Beverage
{
public DarkRoast()
{
description = "DarkRoast";
}
public override double cost()
{
return 2.10;
}
}
public class Espresso : Beverage
{
public Espresso()
{
description = "Espresso";
}
public override double cost()
{
return 1.99;
}
}
public class HouseBlend : Beverage
{
public HouseBlend()
{
description = "House Blend Coffee";
}
public override double cost()
{
return .89;
}
}
public class Mocha : condimentDecorator
{
Beverage beverage;
public Mocha(Beverage beverage)
{
this.beverage = beverage;
}
public override string getDescription()
{
return beverage.getDescription() + ", Mocha";
}
public override double cost()
{
return .20 + beverage.cost();
}
}
public class Soy : condimentDecorator
{
Beverage beverage;
public Soy(Beverage beverage)
{
this.beverage = beverage;
}
public override string getDescription()
{
return beverage.getDescription() + ", Soy";
}
public override double cost()
{
return .10 + beverage.cost();
}
}
public class Whip : condimentDecorator
{
Beverage beverage;
public Whip(Beverage beverage)
{
this.beverage = beverage;
}
public override string getDescription()
{
return beverage.getDescription() + ", Whip";
}
public override double cost()
{
return .10 + beverage.cost();
}
}
我是这样使用它的:
protected void Page_Load(object sender, EventArgs e)
{
Beverage beverage2 = new DarkRoast();
beverage2 = new Mocha(beverage2);
beverage2 = new Mocha(beverage2);
beverage2 = new Whip(beverage2);
Response.Write ("<br> " + beverage2.getDescription() + " : $" + beverage2.cost().ToString());
}
但这改变了我当前的函数,并没有给出期望的结果,它只是将“未知饮料”显示为getDescription()的值,这是父类most的值
正常结果:
DarkRoast, Mocha, Mocha, Whip : $2.6
使用“公共抽象字符串getDescription()”后的结果:
请建议我应该编写/更改什么,以便我可以强制“ConditionDecorator”的子类重写“getDescription();”,并在没有它的情况下获取Resultl作为其工作状态。您可以创建如下新方法:
public abstract class condimentDecorator : Beverage
{
public override string getDescription()
{
return getDescriptionInternal();
}
protected abstract string getDescriptionInternal();
}
这样,所有类都必须间接实现getDescription。您可以创建如下新方法:
public abstract class condimentDecorator : Beverage
{
public override string getDescription()
{
return getDescriptionInternal();
}
protected abstract string getDescriptionInternal();
}
这样,所有类都必须间接实现getDescription。我认为您的类层次结构需要重新思考 这个怎么样: 我的建议是创建一个接口,
IBeverage
,在所有可饮用的东西上实现。然后像现在一样,为“基本”饮料创建一个基类——暗黑咖啡、浓咖啡、家庭混合饮料
对于调味品,您实现了一个新的抽象基类来实现IBeverage,但不提供默认的GetDescription
实现。这个类还可以在其构造函数中使用IBeverage来强制其他调味品也这样做
我认为这样做应该行得通(未经测试,未编译-但你明白了)
我认为你的班级结构需要重新思考 这个怎么样: 我的建议是创建一个接口,
IBeverage
,在所有可饮用的东西上实现。然后像现在一样,为“基本”饮料创建一个基类——暗黑咖啡、浓咖啡、家庭混合饮料
对于调味品,您实现了一个新的抽象基类来实现IBeverage,但不提供默认的GetDescription
实现。这个类还可以在其构造函数中使用IBeverage来强制其他调味品也这样做
我认为这样做应该行得通(未经测试,未编译-但你明白了)
快速谷歌(Quick google)得出了以下结论:
我没有尝试代码本身。快速谷歌发现: 我没有尝试代码本身
public abstract class condimentDecorator : Beverage
{
public override string getDescription()
{
return getDescriptionInternal();
}
protected abstract string getDescriptionInternal();
}
public interface IBeverage
{
string GetDescription ();
}
public abstract class BeverageBase : IBeverage
{
public virtual string GetDescription () { return "Unknown Beverage"; }
}
public class DarkRoast : BeverageBase { ... }
public class HouseBlend : BeverageBase { ...}
public abstract class CondimentBase : IBeverage
{
public CondimentBase(IBeverage beverage)
{
Beverage = beverage;
}
protected IBeverage Beverage { get; set; }
public abstract string GetDescription ();
}
public class Mocha : CondimentBase
{
public Mocha(IBeverage beverage)
: base (beverage)
{ }
public string GetDescription()
{
return Beverage.GetDescription() + ", Mocha";
}
}