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());

Answer 2

I suggest that you first GroupBy the Code property, and then select the Max of each element in the group

Answer 3

Something like

list.GroupBy(item=>item.Code).Select(item=>new {code = item.Key, grade = item.Max(i=>i.Grade)}).ToList();