实体框架的引用不会自动加载 [英] Entity Framework references not loading automatically
问题描述
在ADO.Net Entity Framework的,我有一个对象,它有4个其他对象的引用。出于某种原因,当我查询这些引用,其中两个自动加载(如预期),以及他们两个总是返回null。
In the ADO.Net Entity Framework, I have an object which has 4 references to other objects. For some reason, when I query those references, two of them load automatically (as expected), and two of them always return null.
奇怪的是,当我的手动的要求引用加载,加载它们只是花花公子。
Bizarrely enough, when I manually ask the references to load, they load just dandy.
作为一个例子:
if (account.HoldingEntity == null &&
account.HoldingEntityReference.EntityKey != null) {
account.HoldingEntityReference.Load();
account.HoldingEntity = account.HoldingEntityReference.Value;
}
当我第一次检查 HoldingEntity
它总是空,但负载将返回HoldingEntity没有问题。
When I first check the HoldingEntity
it is always null, however the Load will return the HoldingEntity without problem.
任何线索?
谢谢!
推荐答案
使用ADO.NET实体时,需要指定要与自动加载包含哪些实体
,在
Using ADO.NET Entities, you need to specify what entities you want to load automatically with Include
, as in
Dim entity = (From e in db.Entities.Include("SubEntity"))
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