除了使用 List.Single 获取具有主键的元素之外，还有其他选择吗？
我的数据存储中有一个用户对象列表。
现在，一旦它已经在内存中，通过 ID 获取用户的唯一方法就是使用 Single 扩展方法。这确实是性能下降。
我知道我可以使用字典而不是列表，但这会是多余的。我必须将主键存储两次。那么还有另一种方法可以做我想做的事吗？
顺便说一句，我正在制作一个可以执行类似操作的自定义类，但我希望有一些开箱即用的东西。
I have a List of User objects from my data store.
Now once it is already in memory the only way to get a user by his ID is to use the Single extension method. This is really performance degrading.
I know I could have used a dictionary instead of a list but this would be redundant. I would have to store the Primary Key 2 times. So is there another way to do what i want?
BTW I am making a custom class that can do something like this, but i was hoping for something out of the box.
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假设主键是引用类型，您只需存储对主键的引用两次。
您是否尝试过使用
Dictionary<,>并发现它效果不够好？这当然是最自然的解决方案。KeyedCollection<,>（由 Mark 建议）当然也可以工作，但需要您从该类派生 - 而且我不想保证它实际上会节省任何内存。 （您需要了解实现细节 - 例如，它可以轻松地在内部使用字典。）Assuming the primary key is a reference type, you'd only be storing a reference to the primary key twice.
Have you tried using
Dictionary<,>and found it doesn't work well enough? It's certainly the most natural solution.KeyedCollection<,>(suggested by Mark) would certainly work too, but requires you to derive from the class - and I wouldn't like to guarantee it'll actually save any memory. (You'd need to know the implementation details - it could easily just use a Dictionary internally, for example.)您可以将内存中的用户保存在 KeyedCollection 中。
You could save your in-memory users in a KeyedCollection.