NHibernate的LINQ的是空的左加入

Question

有一種簡單的方法來做到以下NHibernate的LINQ的聲明

var query = from r in myTable.Query<MyTable>() 
      where r.Child == null 
      select r 

LINQ查詢以上產生類似於

SELECT MyTable.Id FROM MyTable WHERE MyTable.ChildId is null 

一些它不能引用子表並檢查左連接是否爲如下所示的空

SELECT MyTable.Id FROM MyTable 
     LEFT JOIN ChildTable ON MyTable.ChildId = ChildTable.Id 
WHERE ChildTable.Id is null 

Answer 1

var query = from r in myTable.Query<MyTable>() 
     where r.Child.Id == null 
     select r