使用“包含”时如何过滤不需要的表？

Question

My EF nightmare continue. I noticed when I use eager loading include all related table will retrieve to my application. So for example 1 have 3 tables/POCO like below, from below POCO and linq i just want to retrieve 2 tables but however when i check the generate T-SQL all 3 tables will retrieve, How do I exclude the table 3?

Poco

public class TableA{
   public virtual ICollection<TableB> B { get; set; }
}

public class TableB{
   public virtual ICollection<TableC> C { get; set; }
}

public class TableC{

}

LINQ

var rs =(from family in context.A.Include("B")
select family).SingleOrDefault();

Answer 1

If you want fine grain control on which entities get loaded, use :

db.Configuration.LazyLoadingEnabled = false;

Note that for each instance of your DbContext, you can either get the lazy loading, OR the eager loading.

You shouldn't try to use both on the same instance.