How to Flatten a dictionary of (int, dictionary)?-CodePudding

I have SortedDictionary<int, Dictionary<string, HashSet<long>>>

How can I flatten the result using Linq?

I've tried:

var result = dictionary.Values.SelectMany(x => x);

but how do I flatten to the very bottom?

I need to get a collection of int, string, HashSet<long>

CodePudding user response：

You may use something like the following:

var flattened = dictionary.SelectMany(x => x.Value.Select(y => (x.Key, y.Key, y.Value)));

This will produce an IEnumerable of ValueTyple<int, string, HashSet<long>>.

Note that because the type here is IEnumerable, it's not yet materialized. You might want to add a .ToList() to the end (in which case, the type will be List<ValueTyple<int, string, HashSet<long>>>) or convert it to any other collection type you desire.