C＃：从多个类扩展 [英] C#: Extending from more than 1 class

问题描述

假设我有一个ViewModel TabViewModel 扩展了 ObservableObject MVVM Foundation Framework中ViewModels的类。然后，我还有一个扩展了 TabViewModel 的 EditorTabViewModel ，现在我需要扩展 DependencyObject 以实现DependencyProperties。我不能超过一堂课。我该如何实施？我可以有一个像这样的中间类……

Suppose I have a ViewModel TabViewModel that Extends ObservableObject the class for ViewModels in the MVVM Foundation Framework. Then I also have a EditorTabViewModel that extends TabViewModel, Now I need to extend DependencyObject to implement DependencyProperties. I cannot extend more than 1 class. How might I implement this? I could have an "intermediate" class like ...

TabViewModel : ObservableObject

EditorTabViewModel : TabViewModel

DependentEditorTabViewModel : DependencyObject

但这就是1个多余的类。还有更好的方法吗？

but thats 1 extra unnecessary class. Any better way to do this?

更新

实际上我做不到的操作以上。 DependentEditorTabViewModel 仍然需要扩展EditorTabViewModel ...除了 DependencyObject

Ops actually I cant do the above. DependentEditorTabViewModel still need to extend EditorTabViewModel ... apart from DependencyObject

推荐答案

C＃不支持多重继承。最好的选择是使用接口，而不是父类。

C# does not support Multiple Inheritance. Your best bet is to use Interfaces, rather than parent classes.

即使您没有使用接口的选择（也许您无权使用代码），通常最好优先考虑组成而不是继承。您真的需要同时继承这两个类吗？还是可以与它们一起合成？

Even if you don't have the option of using interfaces (maybe you don't have access to the code), it's generally better to prefer composition over inheritance. Do you really need to inherit both of these classes, or can you compose with them instead?

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