为什么HashSet< T>不实现IReadOnlyCollection< T>

问题描述

我刚刚发现.NET Fx现在有3个有用的界面：

我有点困惑为什么不实施 IReadOnlyCollection< T> ？有什么原因，或者微软只是忘了设置了？

UPD

在两个小时后，我发现在BCL中有很多集合，它们具有 .Count 属性，但不实现 IReadOnlyCollection< T& / code>接口。

UPD2

此帖子以及 Immo Landwerth的回答，他在其中说出以下内容

解决方案

In version 4.5 of the framework, HashSet<T> does not implement IReadOnlyCollection<out T>.

This omission was resolved in version 4.6 of the framework (released almost 12 months after the above question was asked).

These corrections are not limited to HashSet<T>, other collections such as Stack<T> and Queue<T> have received these improvements.

Speculation on the reason for any omission is moot. It may be oversight or time pressure but frankly, it is of little consequence. I suspect that even direct input from the Microsoft Development Team would be somewhat subjective, even if we enjoy associated anecdotes.

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