MongoDB.Bson.Serialization.BsonClassMapSerializer.SerializeExtraElements C# (CSharp) Метод

        private void SerializeExtraElements(BsonWriter bsonWriter, object obj, BsonMemberMap extraElementsMemberMap)
        {
            var extraElements = extraElementsMemberMap.Getter(obj);
            if (extraElements != null)
            {
                if (extraElementsMemberMap.MemberType == typeof(BsonDocument))
                {
                    var bsonDocument = (BsonDocument)extraElements;
                    foreach (var element in bsonDocument)
                    {
                        bsonWriter.WriteName(element.Name);
                        BsonValueSerializer.Instance.Serialize(bsonWriter, typeof(BsonValue), element.Value, null);
                    }
                }
                else
                {
                    var dictionary = (IDictionary<string, object>)extraElements;
                    foreach (var key in dictionary.Keys)
                    {
                        bsonWriter.WriteName(key);
                        var value = dictionary[key];
                        if (value == null)
                        {
                            bsonWriter.WriteNull();
                        }
                        else
                        {
                            var bsonValue = BsonTypeMapper.MapToBsonValue(dictionary[key]);
                            BsonValueSerializer.Instance.Serialize(bsonWriter, typeof(BsonValue), bsonValue, null);
                        }
                    }
                }
            }
        }