C# 中枚举的数据结构，其中查找通常基于所存储对象的一个属性
我想知道人们会推荐什么数据结构来执行以下操作。 我有一个类，它具有三个主要属性，例如。
public class Example {
public Object One { get; }
public Object Two { get; }
public Object Three { get; }
}
另一个类包含这些对象的集合，并且经常需要枚举这些对象，而我主要使用 LINQ 来枚举这些对象。 虽然很多时候我只需要主要基于属性 One 的值来查找/枚举这些对象的子集，所以我想做的是将它们存储在基于该属性的高效数据结构中。 我可以做如下的事情：
Dictionary<Object,List<Example>>
但这让我觉得效率非常低，我知道我需要某种哈希表，但以前从未在 C# 中使用过哈希表，我不确定要使用什么。
其他一些要求/注意事项：
- 所有对象都是不可变的，并且具有固定的哈希代码，这些哈希代码是根据类在构造函数中实例化的值计算的
- 必须能够存储具有相同属性值（因此哈希代码）的多个项目数据结构中同一“槽”中的一个
- 必须能够自由地从集合中添加和删除对象
I'm wondering what Data Structure people would recommend to do the following. I have a Class which has three main properties eg.
public class Example {
public Object One { get; }
public Object Two { get; }
public Object Three { get; }
}
Another class contains a collection of these Objects and frequently needs to enumerate over these which I do mainly with LINQ. A lot of the time though I need to lookup/enumerate only a subset of these objects based mainly on the value of property One so what I'd like to do is store these in an efficient data structure based on that property. I could do something like the following:
Dictionary<Object,List<Example>>
But this strikes me as being very inefficient, I know I need some kind of Hash Table but having never used one before in C# I'm unsure of what there is to use.
Some other requirements/notes:
- All the Objects are immutable and have fixed Hash Codes which are computed from the values the class gets instantiated with in the constructors
- Must be able to store multiple items that have the same value (and thus Hash Code) for property One in the same 'slot' in the data structure
- Must be able to freely add and remove Objects from the collection
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索引 LINQ 可能可以为您提供帮助。 它提供了一个内存中集合，但允许您将对象的属性属性设置为可索引，以便它可以针对它们创建有效的查询。
Indexed LINQ may be able to help you here. It provides an in-memory collection, but lets you attribute properties on your objects as Indexable so that it can create efficient queries against them.
PowerCollections (http://www.codeplex.com/PowerCollections) 有一个 MultiDictionary 容器 - 也许你可以试试那个？
PowerCollections (http://www.codeplex.com/PowerCollections) has a MultiDictionary container - perhaps you could try that?
或混合字典
or HybridDictionary