Filter out distinct elements with condition

Question

I have a list of objects that has some duplicates by a property. I would like to get all non-duplicate and also 1 of the duplicates based on a condition.

For eg.

Answer 1

You can use GroupBy to do this:

var results = items.GroupBy(item => item.Code)
                   .Select(g => g.OrderByDescending(i => i.Grade)
                   .First());