Linq to entity left join

Question

我無法得到正確的結果，也許它在第一個查詢時崩潰了，有人可以找到問題。

var query = from case in dbEntity.Cases 
    join Comm in dbEntity.Comms on case.log_id equals comm.CaseId into collection 
    from subCase in collection.DefaultIfEmpty() 
    select new { case, subCase.status }; 

我想獲得Comms中的所有案例和狀態值。 log_id和CaseId是加入密鑰。

Answer 1

var query = from case in dbEntity.Cases 
join Comm in dbEntity.Comms on case.log_id equals comm.CaseId into collection 
from subCase in collection.DefaultIfEmpty() 
select new { Case=case,Status= (subCase==null?null:subcase.Status };