是否有一个像集合，可以使用其值的属性作为键的字典？ [英] Is there a dictionary like collection that can use a property of its value as the key?

问题描述

而不是使用词典＆LT; TKEY的，TValue＆GT; 我要某种类型的集合类，可以使用这个值的属性是关键，是有这样的事情？

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 - 的 System.Collections.ObjectModel.KeyedCollection＆LT; TKEY的，TValue＆GT;

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

这是抽象的，有没有具体的派生类的框架，据我所看到的，但所有你需要实现的 GetKeyForItem 据我所见。例如，您可以用委托做到这一点：

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);
    }
}

这篇关于是否有一个像集合，可以使用其值的属性作为键的字典？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！