有没有理由在接口中隐藏继承的成员? [英] Is there ever a reason to hide inherited members in an interface?

问题描述

我了解从另一个类继承的类可能会通过使用 new 关键字来隐藏属性.然而，这隐藏了该属性的特定实现，所以我可以看到它是如何使用的.

I understand that a class which inherits from another class may hide a property by using the new keyword. This, however, is hiding a specific implementation of the property, so I can see how it could be used.

在实现其他接口的接口中隐藏成员是否有任何实际理由?例如考虑下面的例子.IChildInterface 实现 IParentInterface，并隐藏 PropertyA.

Is there any practical reason to hide members in interfaces which implement other interfaces? For example consider the example below. IChildInterface implements IParentInterface, and hides PropertyA.

interface IParentInterface
{
    string Name { get; set; }
    int PropertyA { get; set; }
    int PropertyB { get; set; }
}

interface IChildInterface : IParentInterface
{
    int PropertyA { get; set; }
    int PropertyC { get; set; }
}

推荐答案

是否有任何实际理由在实现其他接口的接口中隐藏成员?

Is there any practical reason to hide members in interfaces which implement other interfaces?

当然.BCL 本身使用此模式的事实表明该模式是实用的.例如:

Sure. The fact that the BCL itself uses this pattern is indicative that the pattern is practical. For example:

interface IEnumerable 
{ 
    IEnumerator GetEnumerator();
}
interface IEnumerable<T> : IEnumerable
{
    new IEnumerator<T> GetEnumerator();
}

IEnumerable<T> 的设计者希望与 IEnumerable 向后兼容，但也希望确保每次使用 GetEnumerator泛型接口称为泛型版本.在这种情况下，隐藏是适当的机制.

The designers of IEnumerable<T> wished to be backwards-compatible with IEnumerable but also wanted to ensure that every usage of GetEnumerator on the generic interface called the generic version. Hiding is the appropriate mechanism in this case.

有关方法隐藏的一些细节的额外讨论，请参阅:

For some additional discussion on subtle points about method hiding, see:

http://blogs.msdn.com/b/ericlippert/archive/2008/05/21/method-hiding-apologia.aspx

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