Question

How would I convert the following into a one liner? I know it is possible but I can’t seem to think of how again. Possibly using selectmany?

    Dim claimIds = allClaimLineItems.Select(Function(i) i.ClaimLineItemId).Distinct()

    For Each id As Guid In claimIds
        Result.ClaimDuplicateItemRuleDataList.Add(GetClaimDuplicateItemRuleDataWithHighestDuplicateFlags(allClaimLineItems.Where(Function(i) i.ClaimLineItemId = id)))
    Next

Thanks!

Answer 1

var result = allClaimLineItems
    .Select(i => i.ClaimLineItemId)
    .Distinct()
    .GroupJoin(allClaimLineItems, g => g, i => i.ClaimLineId, (g, matches) => matches)
    .Select(GetClaimDuplicateItemRuleDataWithHighestDuplicateFlags)
    .ToList();