Using LINQ, select list of objects inside another list of objects
Solution 1:
You're trying to select multiple result objects for each ClassB object in the original list.
Therefore, you're looking for the SelectMany extension method:
var results = classBList.SelectMany(b => b.MyObjects).Distinct();
If you want to use query expressions, you'll need to use two from clauses:
var results = (from b in classBList from a in b.MyObjects select a).Distinct();
Solution 2:
You want to use IEnumerable.SelectMany() Extension Method to flatten the hierarchy:
var result = classBList.SelectMany(b => b.MyObjects).Distinct();