MongoDB.Bson.Serialization.Serializers.ObjectSerializer.Deserialize C# (CSharp) Метод

        public object Deserialize(BsonReader bsonReader, Type nominalType, IBsonSerializationOptions options)
        {
            if (nominalType != typeof(object))
            {
                var message = string.Format("ObjectSerializer can only be used with nominal type System.Object, not type {0}.", nominalType.FullName);
                throw new InvalidOperationException(message);
            }

            var bsonType = bsonReader.GetCurrentBsonType();
            if (bsonType == BsonType.Null)
            {
                bsonReader.ReadNull();
                return null;
            }
            else if (bsonType == BsonType.Document)
            {
                var bookmark = bsonReader.GetBookmark();
                bsonReader.ReadStartDocument();
                if (bsonReader.ReadBsonType() == BsonType.EndOfDocument)
                {
                    bsonReader.ReadEndDocument();
                    return new object();
                }
                else
                {
                    bsonReader.ReturnToBookmark(bookmark);
                }
            }

            var discriminatorConvention = BsonSerializer.LookupDiscriminatorConvention(typeof(object));
            var actualType = discriminatorConvention.GetActualType(bsonReader, typeof(object));
            if (actualType == typeof(object))
            {
                var message = string.Format("Unable to determine actual type of object to deserialize. NominalType is System.Object and BsonType is {0}.", bsonType);
                throw new Exception(message);
            }

            var serializer = BsonSerializer.LookupSerializer(actualType);
            return serializer.Deserialize(bsonReader, nominalType, actualType, options);
        }