db4o Tutorial 中文翻译（八）
6. 继承
到现在为止，我们已经可以操作实体类了。但是如何操作子类或者接口呢？
为了方便讲解，我们将创造不同种类的sensors
Sensor
using System;namespace Db4objects.Db4o.Tutorial.F1.Chapter4
{ 
public class SensorReadout
{ DateTime _time; Car _car; string _description; public SensorReadout(DateTime time, Car car, string description) { _time = time; _car = car; _description = description;
} public Car Car { get