Flutter中json_serializable无法生成.g.dart文件问题求助

先修复代码语法错误 #

你的AppData类构造函数存在语法问题：参数列表结束后缺少分号或函数体，这会导致build_runner解析失败。修改后的代码如下：

import 'package:json_annotation/json_annotation.dart';
part 'AppData.g.dart';

@JsonSerializable()
class AppData {
  String? Username;
  String? Password;
  String? Avatar;
  String? Name;
  String? Family;
  String? FullName;
  String? UserType;
  String? Email;
  String? Mobile;

  // 在构造函数参数列表末尾添加分号
  AppData({this.Username, this.Password, this.Email,
    this.Family, this.Name, this.FullName, this.UserType, this.Mobile, this.Avatar});

  factory AppData.fromJson(Map<String, dynamic> json) =>
      _$AppDataFromJson(json);

  Map<String, dynamic> toJson() => _$AppDataToJson(this);
}

额外排查步骤 #

1. 确认pubspec.yaml中依赖配置正确，添加以下内容后执行flutter pub get：

dependencies:
  json_annotation: ^4.8.1

dev_dependencies:
  build_runner: ^2.4.6
  json_serializable: ^6.7.1

2. 清理构建缓存后重新执行生成命令：

dart run build_runner clean
dart run build_runner build -d

内容的提问来源于stack exchange，提问作者Mohamad Hasan Salmaaniyaan