Quick and Dirty Multiple Value Dictionary Using Extension Methods
Though it's not a collection I tend to reach for often, there have been times when I really need a multiple value dictionary (that is, a dictionary that contains more than one value per key). In the past, I've usually reached for the excellent PowerCollections library to fill the gap. However, that requires bringing in another library and it can be a little heavy-weight for just this one collection class. There are also a ton of other implementations out there. But perhaps there's a better way to fill this need, one that doesn't require a lot of extra code. These two extension methods do most of the work of a multiple value dictionary, but don't require any extra classes or libraries:
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