public void Serialize(MongoDB.Bson.IO.BsonWriter bsonWriter, Type nominalType, IBsonSerializationOptions options)
{
bsonWriter.WriteStartDocument();
var keyValues = AsDictionary();
foreach (var key in keyValues.Keys)
{
if (keyValues[key] == null || keyValues[key] == "" || key == "" || key == "_id") continue;
bsonWriter.WriteName(key);
BsonDefaultSerializer.Instance.GetSerializer(keyValues[key].GetType()).Serialize(bsonWriter,
keyValues.GetType(), keyValues[key], options);
}
bsonWriter.WriteEndDocument();
}