Get Non-Distinct elements from an IEnumerable

Question

I have a class called Item. Item has an identifier property called ItemCode which is a string. I would like to get a list of all non-distinct Items in a list of Items.

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Answer 1

You might want to try it with group by operator. The idea would be to group them by the ItemCode and taking the groups with more than one member, something like :

var grouped = from i in itemList
              group i by i.ItemCode into g
              select new { Code = g.Key, Items = g };

var result = from g in grouped 
             where g.Items.Count() > 1;