score:2
Accepted answer
Try below code
var summaryPayments = (from s in paymentsList
join alloc in allocationList on s.ID equals alloc.OriginalID into allocOrg
from po in allocOrg.DefaultIfEmpty()
join allocRev in allocationList on s.ID equals allocRev.ReversalID into allocRevs
from pr in allocRevs.DefaultIfEmpty()
select new { s, pr }).Select(x => { x.s.ReversalId = (x.pr != null ? x.pr.ReversalID : 0); return x.s; });
Source: stackoverflow.com
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