如何在实体框架查询中使用左外连接

Question

如何在实体框架查询中使用leftouter join

我有两个表一个是项目，另一个是库存可用我想获得所有项目，并从库存可用表中获取其数量，这取决于特定部门

Answer 1

例如 LINQ查询

var query = (from p in dc.GetTable<Person>()
join pa in dc.GetTable<PersonAddress>() on p.Id equals pa.PersonId into tempAddresses
from addresses in tempAddresses.DefaultIfEmpty()
select new { p.FirstName, p.LastName, addresses.State });

SQL翻译

SELECT [t0].[FirstName], [t0].[LastName], [t1].[State] AS [State]
 FROM [dbo].[Person] AS [t0]
 LEFT OUTER JOIN [dbo].[PersonAddress] AS [t1] ON [t0].[Id] = [t1].[PersonID]