c# - 继承 : possible to change base reference to something else?

Question

例如我有两个类，Base 和 Derived，如下所示:

class Base  
{        
    public string Name { get; set; }

    public Base()
    {

    }
}

class Derived : Base
{
    public Derived(Base b)
    {
        base = b; // doesn't compile, but is there any way to do something similar?
    }
}  

所以他们的行为是这样的:

Base b = new Base();
b.Name = "Bob";
Derived d = new Derived(b);
d.Name = "John";
// b.Name is now "John" also

这可能吗？我想一种方法是在 Derived 中保留 Base b 引用并覆盖 Derived.Name 以指向 b.Name？有没有更简单的方法，例如，如果我有 50 个属性要覆盖？

class Derived : Base
{
    Base b;

    public override string Name
    {
        get { return b.Name; }
        set { b.Name = value; }
    }

    public Derived(Base b)
    {
        this.b = b;
    }
}

编辑:

我猜另一种说法是我正在为类 Base 创建一种包装器。我得到了一个 Base 类型的对象，我想用类 Derived 包装它，但仍然保留 Base 的原始公共(public)属性/方法/等。我不确定这是否使它更清楚。

Answer 1

我认为从您似乎暗示的内容来看(至少从编辑 - “我正在为类 Base 创建一种包装器”)，您正在考虑使用 Decorator 模式:

http://en.wikipedia.org/wiki/Decorator_pattern

The decorator pattern can be used to extend (decorate) the functionality of a certain object at run-time, independently of other instances of the same class, provided some groundwork is done at design time. This is achieved by designing a new decorator class that wraps the original class.