by FransBouma via Frans Bouma's blog on 5/18/2009 8:52:00 AM
By popular demand, I've published the C# source code of my Multi-value Dictionary class, which can also merge dictionaries into itself and which implements ILookup<T, V> as well. It's part of Algorithmia, our upcoming data-structure and algorithm library which will ship with LLBLGen Pro v3.0 later this year. The code is released under the BSD2 license, see the enclosed readme.txt. The class comes with its own general purpose Grouping<T, V> class as well and of course its own ToMultiValueDictionary() extension method.
I hope this is useful to others.
Update: it seems that if you run a Linq query (Linq to objects) over the MultiValueDictionary, the compiler and intellisense get confused as there are now two enumerators and both work with the linq operators, which means you either want to remove the ILookup code from the class (which is not that hard) or explicitly state the generic arguments. It's not a big problem, though in case you run into this problem, you know the reason.
Update 2:A user pointed out that I forgot to include ArgumentVerifier, a simple class to make life easier wrt verifying arguments, so I've included that one as well.
Original Post: Multi-value Dictionary C# source code (.NET 3.5)
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