多值字典？ [英] Multi Value Dictionary?

问题描述

任何人都知道一个好的实施的 MultiValueDictionary ？基本上，我想要的东西，让每个键多个值。我希望能够做一些像

Anyone know of a good implementation of a MultiValueDictionary? Basically, I want something that allows multiple values per key. I want to be able to do something like

dict.Add(key, val);

如果该键不存在，它会添加它，如果这样做，它只是另一个值添加到该键。我只是要遍历它，所以我真的不关心等多种检索方式。

And if the key doesn't already exist, it will add it, if it does, it will just add another value to that key. I'm just going to iterate over it, so I don't really care about the other retrieval methods.

推荐答案

这是不存在的，但你可以从字典和列表快速构建您只需用pretty：

It doesn't exist, but you can build one pretty quickly from Dictionary and List:

class MultiDict<TKey, TValue>  // no (collection) base class
{
   private Dictionary<TKey, List<TValue>> _data =  new Dictionary<TKey,List<TValue>>();

   public void Add(TKey k, TValue v)
   {
      // can be a optimized a little with TryGetValue, this is for clarity
      if (_data.ContainsKey(k))
         _data[k].Add(v)
      else
        _data.Add(k, new List<TValue>() { v}) ;
   }

   // more members
}

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