将SQL查询转换为lambda表达式 [英] convert sql query into lambda expression

问题描述

这是我的SQL查询，我想将其转换为lambda表达式

Here is my sql query i want to convert it into lambda expression

Select P.PlaceName As UnitNumber, 
       PB.PlaceName, 
       A.Locality, 
       A.SubLocality, 
       A.Sublocality_Level_1   
from Listing L 
inner join Place P ON L.PlaceId = P.Id
Inner Join Place PB ON PB.Id = P.ParentPlaceId
Inner Join [Address] A ON A.Id = PB.AddressId
Where L.Id =9

先谢谢了.

推荐答案

在这种情况下，查询表达式要简单得多.我不建议您将lambda与很多连接一起使用

Query expression is much simpler in this case. I don't recommend you to use lambdas with many joins

from l in db.Listing
join p in db.Place on l.PlaceId equals p.Id
join pb in db.Place on p.ParentPlaceId equals pb.Id
join a in db.Address on pb.AddressId equals a.Id
where l.Id == 9
select new {
   UnitNumber = p.PlaceName,
   pb.PlaceName,
   a.Locality,
   a.SubLocality,
   a.Sublocality_Level_1
}

db是您的上下文

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