为什么不净有一组数据结构？ [英] Why doesn't .Net have a Set data structure?

问题描述

我的一个处理从Java移动到.NET最大的问题是事实，没有.NET中设置接口。我知道有图书馆，我可以去下载，但什么是没有这样的勇气内置的原因吗？有地图（词典）和列表，但为什么不是一套？

One of my biggest issues dealing with a move from Java to .Net is the fact that there isn't a Set interface in .Net. I know there are libraries I could go and download but what is the reason for not having it built in? There are Maps (Dictionary) and Lists but why not a Set?

修改：我要澄清的是，不是每个人都使用的.Net 3.5还没有 - 所以我或多或少提及旧版本的.Net的

Edit: I should clarify that not everyone uses .Net 3.5 yet -- so I'm more or less referring to older versions of .Net

推荐答案

我觉得它只是一个遗漏的BCL作家。 .NET 3.5拥有 HashSet的类;对于早期版本，我建议封装字典＆LT; T，对象＆gt ;,在值字段为空，复制O（1）添加，删除，查找时间

I think it's simply an omission by the BCL writers. .NET 3.5 has a HashSet class; for earlier versions, I recommend wrapping a Dictionary<T, object>, with nulls in the value field, to replicate O(1) add, remove and lookup time.

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