C# 3.0: Need to return duplicates from a List<>

Question

I have a List<> of objects in C# and I need a way to return those objects that are considered duplicates within the list. I do not need the Distinct resultset, I need a

Answer 1

Without actually coding it, how about an algorithm something like this:

• iterate through your List creating a Dictionary
• iterate through your Dictionary deleting entries where the int is >1

Anything left in the Dictionary has duplicates. The second part where you actually delete is optional, of course. You can just iterate through the Dictionary and look for the >1's to take action.

EDIT: OK, I bumped up Ryan's since he actually gave you code. ;)