Entitiy Framework对象树加载

Question

如何在接下来的EF实体加载：

图片来源：http://blogs.microsoft.co.il/blogs/idof/archive/2008/08/20/entity-framework-and-lazy-loading.aspx

比方说，我们有地址的ID，我们要加载与人的地址和宠物。怎么做？

我们能做到这一点

var address = contex.Addresses.Include("Peson").Where(add => add.Id == GivenId); 

但它载入地址和人W/O宠物。

如果我包括宠物实体，像这样：

var address = contex.Addresses.Include("Peson").Include("Pets").Where(add => add.Id == GivenId); 

我得到错误：

一个指定的包含路径无效。

所以，问题是如何加载整个实体树。

Answer 1

您可以通过使用分离的关系加载树

context.Address.Include("Person.Pets"); //Include all the persons with their pets 
context.Pets.Include("Person.Address"); //Include all the persons with their addresses 

Answer 2

始终从最顶层的对象下移选择，是这样的：“”

var person = from p in context.Person.Include("Pets").Include("Address") 
where p.Address.Id == givenId 
select p;