LINQ Join 2 Lists

Question

Preface: I don\'t understand what this does:

o => o.ID, i => i.ID, (o, id) => o

So go easy on me. :-)

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I have 2 lis

Answer 1

Here is what I came up with (based on this):

        List list3 = (from item1 in list1
            join item2 in list2
            on item1.ContactID equals item2.ContactID into g
            from o in g.DefaultIfEmpty()
            select o == null ? item1 :o).ToList();

My favorite part is the big nosed smiley

:o)

Thanks for your help!