角度警告"警告:无法解析所有参数......"

Question

我有一个Ionic/Angular应用程序,我刚刚更新到Ionic 3/Angular 4.我有几个我用于页面的基类...

@Injectable()
export abstract class BasePage {
  constructor(
   userMessageService: UserMessageService,
   logger: Logger,
   translate: TranslateService,    
   derivedClassName: string,    
 ) {
   super(userMessageService, logger, translate, derivedClassName);
   this.data = new Array<T>();
 }

升级后,我现在收到以下警告..

Warning: Can't resolve all parameters for PageBase in D:/dev/myapp/src/pages/page-base.ts: ([object Object], [object Object], [object Object], ?). This will become an error in Angular v5.x

Warning: Can't resolve all parameters for CardPageBase in D:/dev/myapp/src/pages/card-page-base.ts: ([object Object], [object Object], [object Object], ?). This will become an error in Angular v5.x

所以它似乎不喜欢这个string论点.所有我使用它是为了一些日志记录,我只是传递它在我实例化从这一个派生的类..

例如 super(userMessageService, logger, translate, 'MyPage');

有谁知道为什么这看起来不可能,而且我现在如何传递这样的参数(希望无需单独的init方法设置)

在此先感谢您的帮助!

Answer 1

发现我的问题.我认为你需要@Injectable()基础页面类,例如..

    @Injectable()
    export abstract class BasePage {
      constructor(protected name : string, messageProvider : MyServiceProvider) {
        console.log("Baseclass calls " + messageProvider.getMessage());
      }
    }

当我删除它时,它仍然工作正常,错误消失了.我应该在原始问题中包含类def(我现在将添加)