private void SerializeMember( BsonWriter bsonWriter, object obj, BsonMemberMap memberMap ) { var value = memberMap.Getter(obj); if (value == null && memberMap.IgnoreIfNull) { return; // don't serialize null value } if (memberMap.HasDefaultValue && !memberMap.SerializeDefaultValue && object.Equals(value, memberMap.DefaultValue)) { return; // don't serialize default value } if (!memberMap.ShouldSerializeValue(obj)) { return;// the object determined that it does not need serialization. } bsonWriter.WriteName(memberMap.ElementName); var nominalType = memberMap.MemberType; var actualType = (value == null) ? nominalType : value.GetType(); var serializer = memberMap.GetSerializer(actualType); serializer.Serialize(bsonWriter, nominalType, value, memberMap.SerializationOptions); }