如何结合使用LINQ和自定义序列化器？ （MONGODB C＃）

Question

I have a few entities that have custom serializers.

public class EntitySerializer : BsonBaseSerializer, IBsonIdProvider
{
   public override object Deserialize(MongoDB.Bson.IO.BsonReader bsonReader, Type nominalType, Type actualType, IBsonSerializationOptions options){
      ...
      bsonReader.ReadName(); // _id
      ObjectId id = bsonReader.ReadObjectId();
      ...
}
public override void Serialize(MongoDB.Bson.IO.BsonWriter bsonWriter, Type nominalType, object value, IBsonSerializationOptions options)
{
     ...
     bsonWriter.WriteObjectId("_id", ent.Id);
     ...
    }
}

....

BsonSerializer.RegisterSerializer(typeof(Entity), new EntitySerializer());

Now I would like to query this entity through LINQ.

GetEntityCollection().AsQueryable<Entity>().Where(d=>d.Id==new ObjectId("51b8939d3f92b82db4ad1db0"))

This returns me the following error

NotSupportedException: Unable to determine the serialization information for the expression: d.Id.

This behavior does not occur when not using a custom serializer so I am guessing I forgot or missed something. Searching the internet did not yield me anything that I could resolve the error with. Could someone please show me what I am missing?

---

Solution given at Google Groups: implement IBsonDocumentSerializer.

Answer 1

If you are serializing to a document, your custom serializer needs to implement IBsonDocumentSerializer. IF it is serializing to an array, it needs to implement IBsonArraySerializer. These interfaces allow Linq to work with custom classes.