A collegue of mine needed an algorithm to filter out duplicate objects in a List and count the total occurence of each distinct object. He used this query to get his results, it may be usefull to some of you.
myRoles = from c in allRoles
group c.RoleId
by new { c.PersonId, c.RoleTypeId }
into g
orderby g.Count() descending
select g;Credits go to Roel Dieltjens
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