LINQ - Convert List to Dictionary with Value as List

Question

I have a

List 

that I retrieve from the database. However, I would like it keyed by a property in MyObject for grouping pu

Answer 1

You should use the ToLookup extension method on the Enumerable class like so:

List list = ...;

ILookup lookup = list.ToLookup(o => o.KeyedProperty);

If you want to place that in a dictionary, then you could use the ToDictionary extension method, like so:

IDictionary> dictionary = lookup.ToDictionary(
    l => l.Key);