linq - Linq 到实体左连接

Question

我无法得到正确的结果，也许它在第一次查询时就坏了，有人能找到问题所在。

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 };

我想获取所有案例和状态值Comms。log_id并且CaseId是连接键。

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 };