我有一个类似这样的对象：
[BsonKnownTypes(typeof(Bike),typeof(Car),typeof(Van))]
public class Vehicle
{
public List<Wheel> wheels;
}
public class Bike: Vehicle
{
}
public class Car: Vehicle
{
}
public class Van: Vehicle
{
}
[BsonKnownTypes(typeof(WheelA),typeof(WheelB))]
public class Wheel
{
}
public class WheelA: Wheel
{
private int Propa;
}
public class WheelB: Wheel
{
private int Propb;
}
我有一个名为车辆的集合,并将所有派生对象存储在此集合中.车辆已经为“轮”类型嵌入物体集合.如果我的收藏有不同类型的轮子,那些类型不会被反序列化.有没有办法可以使用嵌入式对象的多态.
解决方法
尝试注册派生类型,如：
BsonClassMap.RegisterClassMap<WheelA>(); BsonClassMap.RegisterClassMap<WheelB>();
或者喜欢：
[BsonDiscriminator(required = true)] [BsonKnownTypes(typeof(WheelA),typeof(WheelB))] public class Wheel
更新：在创建测试项目时,我意识到：您需要使属性公开.
MongoDB无法设置它们,如果它们不可访问.
以下是测试代码：
[TestClass]
public class IntegrationTests
{
[TestMethod]
public void Polymorphic_objects_should_deserialize()
{
var database = MongoDatabase.Create("connection_string");
var collection = database.GetCollection("vehicles");
var car = new Car
{
wheels = new List<Wheel>
{
new WheelA {propA = 123},new WheelB {propB = 456}
}
};
collection.Insert(car);
var fetched = collection.AsQueryable<Car>()
.SingleOrDefault(x => x.Id == car.Id);
Assert.IsNotNull(fetched.wheels);
Assert.AreEqual(2,fetched.wheels.Count);
Assert.IsInstanceOfType(fetched.wheels[0],typeof(WheelA));
Assert.IsInstanceOfType(fetched.wheels[1],typeof(WheelB));
Assert.AreEqual(123,(fetched.wheels[0] as WheelA).propA);
Assert.AreEqual(456,(fetched.wheels[1] as WheelB).propB);
}
}
实体与您的列表相同,除了Propa& Propb,被公开.我还向Vehicle添加了一个Id字段,以便能够测试它.测试是绿色的
