我需要的功能就像一个字典/哈希表在一定意义上，它仅包含一个给定对象的1个实例在任何时候的集合。泛型类是preferable，但我会采取什么我可以得到的。这是否收集地方住的框架？

I need a collection that works just like a Dictionary/Hashtable in a sense that it will only contain 1 instance of a given object at any time. A generic class would be preferable, but I'll take what I can get. Does this collection live somewhere in the framework?

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的HashSet＆LT; T＆GT; 从 System.Core.dll的