import 'package:json_annotation/json_annotation.dart'; part 'base_page.g.dart'; @JsonSerializable(includeIfNull: false) class BasePage extends Object { @JsonKey(name: 'PageNumber') int page; @JsonKey(name: 'PageSize') int limit; @JsonKey(name: 'PageIndex') int? _pageIndex; BasePage(this.page, this.limit) : _pageIndex = page; // ignore: non_constant_identifier_names int get PageIndex => page; set PageIndex(int newValue) { _pageIndex = newValue; page = newValue; } factory BasePage.fromJson(Map srcJson) { return _$BasePageFromJson(srcJson); } Map toJson() { return _$BasePageToJson(this); } }