Converting Lookup into other data structures c#

Question

I have a

Lookup

where the TElement refers to a string of words. I want to convert Lookup into:

Answer 1

A lookup is a collection of mappings from a key to a collection of values. Given a key you can get the collection of associated values:

TKey key;
Lookup lookup;
IEnumerable values = lookup[key];

As it implements IEnumerable> you can use the enumerable extension methods to transform it to your desired structures:

Lookup lookup = //whatever
Dictionary dict = lookup.ToDictionary(grp => grp.Key, grp => grp.ToArray());
List> lists = lookup.Select(grp => grp.ToList()).ToList();