如何将继承与返回的其他继承的属性映射？
我有抽象类 Vehicle 和两个派生自的类：Car 和 ForkLift。
public abstract class Vehicle
{
public EngineBase Engine { get; set; }
}
public class Car : Vehicle
{
public GasEngine Engine { get; set; }
}
public class ForkLift : Vehicle
{
public ElectricEngine Engine { get; set; }
}
和引擎类：
public abstract class EngineBase
{
}
public class GasEngine : EngineBase
{
}
public class ElectricEngine : EngineBase
{
}
引擎通过“每个类层次结构的表”进行映射。对于车辆，我想使用相同的模式。
如何映射 Engine 类并使用该 Engine 属性派生？
如何使用延迟加载来做到这一点？
I have abstract class Vehicle and two classes that derive from: Car and ForkLift.
public abstract class Vehicle
{
public EngineBase Engine { get; set; }
}
public class Car : Vehicle
{
public GasEngine Engine { get; set; }
}
public class ForkLift : Vehicle
{
public ElectricEngine Engine { get; set; }
}
and Engine clasess:
public abstract class EngineBase
{
}
public class GasEngine : EngineBase
{
}
public class ElectricEngine : EngineBase
{
}
Engines are mapped with "table per class hierarchy". With Vehicles I want to use the same pattern.
How to map Engine class and derived with that Engine property?
How to do it with lazy-loading?
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评论（2）
该代码无法编译，这使得您不可能映射它。
That code does not compile, which makes it improbable that you can map it.
在 Vehicle 中使用受保护的字段并使用访问策略映射它：
在 Fluent NHibernate 中，这将被映射：
然后扩展 Vehicle 的类可以根据需要对其进行转换：
Use a protected field in Vehicle and map it with an access strategy:
In Fluent NHibernate this would be mapped:
Then the classes that extend Vehicle can cast it as needed: