是否有一个类似字典的集合，可以使用其值的属性作为关键？ [英] Is there a dictionary like collection that can use a property of its value as the key?

问题描述

而不是使用 Dictionary< TKey，TValue> 我想要一些类型的集合类，可以使用值的属性作为键，有这样吗？

Instead of using Dictionary<TKey,TValue> I want some type of collection class that can use a property of the value as the key, is there something like this?

推荐答案

是的，有 - System.Collections.ObjectModel.KeyedCollection< TKey，TValue> 。

Yes, there is - System.Collections.ObjectModel.KeyedCollection<TKey, TValue>.

这是抽象的，在框架中没有具体的派生类，只要我能看到，但你需要实现 GetKeyForItem 到目前为止我所看到的。例如，您可以使用委托：

That's abstract, and there are no concrete derived classes in the framework as far as I can see, but all you need to implement is GetKeyForItem as far as I can see. For example, you could do this with a delegate:

public class DelegatingKeyedCollection<TKey, TItem> : System.Collections.ObjectModel.KeyedCollection<TKey, TItem>
{
    private readonly Func<TItem, TKey> keySelector;

    public DelegatingKeyedCollection(Func<TItem, TKey> keySelector)
    {
        this.keySelector = keySelector;
    }

    protected override TKey GetKeyForItem(TItem item)
    {
        return keySelector(item);
    }
}

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