.net - 为什么 ICollection 不实现 ICollection？

Question

这个问题在这里已经有了答案:





Why does IEnumerable<T> inherit from IEnumerable?

(4 个回答)


8年前关闭。



IEnumerable<T>实现 IEnumerable .
但是ICollection<T>未实现 ICollection .

这样做的理由是什么和/或这只是一个疏忽？

Answer 1

正如尼克所说，ICollection几乎没用。
这些接口(interface)仅在名称上相似，CopyTo和 Count是唯一的共同属性。 Add , Remove , Clear , Contains和 IsReadOnly已在 IsSychronized 时添加和 SyncRoot已被删除。
本质上，ICollection<T>是可变的，ICollection不是。
Krzysztof Cwalina有更多关于这个topic

ICollection<T> seems like ICollection, but it’s actually a very different abstraction. We found that ICollection was not very useful. At the same time, we did not have an abstraction that represented an read/write non-indexed collection. ICollection<T> is such abstraction and you could say that ICollection does not have an exact corresponding peer in the generic world; IEnumerable<T> is the closest.