我需要在子母关系中继承和抽象两个层次 [英] I need to 2 levels of inheritance and abstraction in master-child relationship

问题描述

假设我有一个业务案例，我想使用某种模型来表示主子结构.而且某些类可以同时从主类和子类中继承.

Let's assume I have a business case I want to use some model to represent a master-child structure. And there will be certain classes to inherit from both the master class and child class.

我使用下面的示例

public abstract class BaseChild
{
    public int MyProperty { get; set; }
}

public abstract class BaseMaster
{
    public abstract ReadOnlyCollection<BaseChild> Children { get; }
}

现在，我需要真实的类来继承它们.因此，有

Now I need real classes to inherit from them. So have following

public class FirstRealChild : BaseChild
{
    public int AdditionalProperty { get; set; }
}

public class FirstRealMaster : BaseMaster
{
    public ReadOnlyCollection<FirstRealChild> Children { get; }
}

当然会因为错误而无法编译

Of course it won't compile because of the error

'FirstRealMaster'未实现继承的抽象成员 'BaseMaster.Children.get'

'FirstRealMaster' does not implement inherited abstract member 'BaseMaster.Children.get'

我可以从BaseMaster类中删除public abstract ReadOnlyCollection<BaseChild> Children { get; }，但是它对所有需要子类的继承类都失去了约束.

I can remove the public abstract ReadOnlyCollection<BaseChild> Children { get; } from BaseMaster class, but it loses the constraint to all inherited classes that children are required.

有人有更好的主意吗?

推荐答案

您可能会使用泛型:

public abstract class BaseMaster<TChild> where TCHild : BaseChild
{
    // this probably doesn't have to be 'abstract' anymore
    public abstract ReadOnlyCollection<TChild> Children { get; }
}

public class FirstRealMaster : BaseMaster<FirstRealChild>
{
}

但是，我们对Master和Child类之间的关系了解得还不够清楚.

But we don't know enough about the relation between Master and Child classes to be sure.

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