Wulveagfin.NKeyHash (nuget): NKeyHash is a IEnumerable-enabled multikey-singlevalue collection. It can use System.Collections.HashTable, System.Collections.Generic.Dictionary, System.Collections.Generic.SortedDictionary, or System.Collections.Concurrent.ConcurrentDictionary for the underlying base hashable object. NKeyHash uses generics to create nested hashable objects.  NKeyValue is used to express internal objects within the NKeyHash universe.  It can also be used on its own as a generic based object representing multiple keys to one value.  Check the Project Site and look up the unit tests for examples.
Keywords: ienumerable|nkeyhash|nkeyvalue|multikeyvalue|multikey|mulltidimensional|nkeydictionary|dictionary