Question

我正在使用角度6，但在组件NavBarComponent中有问题。

问题：Can't resolve all parameters for NavbarComponent: (?, [object Object], [object Object], [object Object], [object Object], [object Object], [object Object]).

这是NavbarComponent的代码：

export class NavbarComponent implements OnInit {
    ...
    constructor(
        private loginService: LoginService,
        private languageService: JhiLanguageService,
        private languageHelper: JhiLanguageHelper,
        private principal: Principal,
        private loginModalService: LoginModalService,
        private profileService: ProfileService,
        private router: Router
    ) {
    }

我猜这是由于LoginService引起的（由于(?)。）因此，这里是LoginService的代码：

@Injectable({ providedIn: 'root' })
export class LoginService {
    constructor(
        private extraUsrService: ExtraUserService,
        private currentExtraUsrService: CurrentExtraUserService,
        private languageService: JhiLanguageService,
        private principal: Principal,
        private trackerService: JhiTrackerService,
        private authServerProvider: AuthServerProvider        
    ) {}

我知道，如果删除ExtraUserService行，则不会出错。但是，如果我坚持下去。这是ExtraUserService：

@Injectable({ providedIn: 'root' })
export class ExtraUserService {
    private resourceUrl = SERVER_API_URL + 'api/extra-users';

    constructor(private http: HttpClient) {}

对于每个服务，由于providedIn: root，这是一个单例。我想这是一个循环导入问题，但是我很难找到它。你有什么想法？

注入服务后无法解析NavbarComponent的所有参数

0 个答案: