C# 删除装饰设计模式中装饰对象的某些选项

我有一些C#代码，如下所示，我想在添加后删除装饰对象，例如我有一杯加牛奶和糖的茶加饼干，我想从Order类中删除糖，如何使用装饰设计模式做到这一点：

public abstract class Order
{
    private int _Cost = 0;
    private string _Description = "";
    public virtual int GetCost()
    {
        return _Cost;
    }
    public virtual string GetDescription()
    {
        return _Description;
    }
}

public class Coffee : Order
{
    int _Cost = 3000;
    string _Description = "Coffee";
    public override int GetCost()
    {
        return _Cost;
    }
    public override string GetDescription()
    {
        return _Description;
    }
}

public class Tea : Order
{
    int _Cost = 2000;
    string _Description = "Tea";
    public override int GetCost()
    {
        return _Cost;
    }
    public override string GetDescription()
    {
        return _Description;
    }
}

public abstract class Options : Order
{
    int _Cost = 0;
    string _Description = "No Option";
    public override int GetCost()
    {
        return _Cost;
    }
    public override string GetDescription()
    {
        return _Description;
    }
}

public class Honey : Order
{
    int _Cost = 800;
    string _Description = "Honey";
    public Honey(Order order)
    {
        _Cost = _Cost + order.GetCost();
        _Description = order.GetDescription() + " And " + _Description;
    }
    public override int GetCost()
    {
        return _Cost;
    }
    public override string GetDescription()
    {
        return _Description;
    }
}

public class Biscuit : Order
{
    int _Cost = 400;
    string _Description = "Biscuit";
    public Biscuit(Order order)
    {
        _Cost = _Cost + order.GetCost();
        _Description = order.GetDescription() + " And " + _Description;
    }
    public override int GetCost()
    {
        return _Cost;
    }
    public override string GetDescription()
    {
        return _Description;
    }
}

public class Sugar : Order
{
    int _Cost = 300;
    string _Description = "Sugar";
    public Sugar(Order order)
    {
        _Cost = _Cost + order.GetCost();
        _Description = order.GetDescription() + " And " + _Description;
    }
    public override int GetCost()
    {
        return _Cost;
    }
    public override string GetDescription()
    {
        return _Description;
    }
}

public class Milk : Order
{
    int _Cost = 600;
    string _Description = "Milk";
    public Milk(Order order)
    {
        _Cost = _Cost + order.GetCost();
        _Description = order.GetDescription() + " And " + _Description;
    }
    public override int GetCost()
    {
        return _Cost;
    }
    public override string GetDescription()
    {
        return _Description;
    }
}

---

如果您能尽快回答我，我将不胜感激……

您不能也不应该这样做。装饰者的目的是对他们的客户（包括其他装饰者）完全透明。此外，装饰师应按其意图用于（按照GoF的规定）：

动态地将附加职责附加到对象

顺便说一句，我不认为你的

饼干

或

茶

应该是订单的装饰者（并被视为订单）。创建包含项目列表的

订单

。即使用聚合而不是继承。考虑服务员创建的订单：

• 加糖和柠檬的茶x 2
• 牛奶咖啡
• 饼干

我认为你的领域模型应该看起来是一样的