[每当使用自定义序列化程序时,它都会在数据库中正确设置属性值,但是对象上的属性仍然是默认值。
自定义序列化器:
public class RngSerializer : SerializerBase<int>
{
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, int value)
{
var rng = new Random().Next(0, 100);
Console.WriteLine($"Generated rng {rng}");
context.Writer.WriteInt32(rng);
}
}
对象:
public class Entity
{
[BsonId]
[BsonRepresentation(BsonType.ObjectId)]
public string Id { get; set; }
[BsonSerializer(typeof(RngSerializer))]
public int RngProp { get; set; }
}
执行插入的代码:
var entity = new Entity();
collection.InsertOne(entity);
Console.WriteLine($"Inserted Id {entity.Id}, Rng {entity.RngProp}");
您可以看到序列化程序被称为更正,当我检查数据库中的对象时,也会设置该值。但是,驱动程序似乎没有正确设置该属性。
Generated rng 32
插入ID 5e4ade582c509931f4467e38,Rng 0
我通过在发生这种插入之前触发序列化程序找到了解决方案;
var bson = entity.ToBson();
var hydrated = BsonSerializer.Deserialize<Entity>(bson);
collection.InsertOne(hydrated);
hydrated.Id = entity.Id;
并相应地更改序列化器;
public class RngSerializer : SerializerBase<int>
{
#region Overrides of SerializerBase<int>
public override int Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
{
return context.Reader.ReadInt32();
}
#endregion
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, int value)
{
//This part is important otherwise it will call the rng twice, once when the ToBson() is called and once when inserting.
if (value == 0)
{
var rng = new Random().Next(0, 100);
Console.WriteLine($"Generated rng {rng}");
context.Writer.WriteInt32(rng);
}
else
{
context.Writer.WriteInt32(value);
}
}
}
这可能不是最优雅的方法,但是它给了我预期的结果。