使用.Include和继承 [英] Using .Include with inheritance

问题描述

我在使用带有继承类的.Include命令时遇到了麻烦。

解决方案

如果我可以重复我认为你在说什么（在我自己的话语与我自己的情景）。

场景：
我有两个EntityTypes：Car和SportsCar（源自Car），我有一套名为"Cars"的东西。
Car一个名为"制造商"的导航属性

SportsCar有一个名为"Spoiler"的导航属性。

鉴于此场景，我认为*这个：

context.Cars.Include（ "Spoiler"）l

是不可能的，因为有些汽车不能有一个Spoiler。

但是我怀疑这是可能的：

context.Car .OfType< SportsCar>（）。包括（"Spoiler"）;

我将为您确认两种方式

I am having trouble using .Include commands with inherited classes.

解决方案

If I can repeat what I think you are saying (in my own words with my own scenario).

Scenario:
I have two EntityTypes: Car and SportsCar (which derives from Car) and I have one set called "Cars".
Car has a navigation property called "Manufacturer"
SportsCar has a navigation property called "Spoiler".

Given this scenario then I *think* this:

context.Cars.Include("Spoiler")l
 
is impossible, because some of the cars can't have a Spoiler.

However I suspect this would be possible:

context.Car.OfType<SportsCar>().Include("Spoiler");

I will confirm either way for you
Cheers
Alex

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