[英]C# Entity Framework - returning list of single entity after a join lambda query
我有两节课:
public class classA
{
public string keyA {get; set;}
public string propAA {get; set;}
public string propAB {get; set;}
public string propAC {get; set;}
}
public class classB
{
public string keyB {get; set;}
public string foreignkeyA {get; set;}
public string propBA {get; set;}
public string propBB {get; set;}
public string propBC {get; set;}
}
如果我加入他们之间。
var query = db.ClasseA.
Join(db.ClasseB, a => a.keyA, b => b.foreignkeyA,
(ca, cb) => new { ca, cb })
.Where(q => q.cb.propBC == 'some value')
.Select();
结果是classA和classB对象的组合(列表)。
但是,我需要结果只是A类的列表。
就像是:
List<classA> query = db.ClasseA.
Join(db.ClasseB, a => a.keyA, b => b.foreignkeyA,
(ca, cb) => new { ca, cb })
.Where(q => q.cb.propBC == 'some value')
.Select(????);
我怎样才能做到这一点??
一个例子
var query = from obj1 in db.Object1
join obj2 in db.Object2 on obj1.key equals obj2.somekey
where obj1.something = "something"
select obj1
这将加入两者,但只会带回obj1项目
参考: https : //msdn.microsoft.com/en-us/library/bb311040.aspx
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