无法从RouterStateSnapshot访问服务中的路由元数据

Question

我想从服务访问活动路径的元数据（导航后），但我看到的每个示例都来自组件或路线保护的观点。

我有以下设置：

路线

enum PageNames  {
  Dashboard = 'Dashboard',
  SampleView2 = 'SampleView2'
}

const routes: Routes = [
    {
        path: '',
        redirectTo: 'home',
        pathMatch: 'full'
    },
    {
        path: 'home',
        component: HomeComponent,
        data: {
          name: PageNames.Dashboard
        },
        canActivate: [AuthGuardService]
    },
    {
        path: 'view2',
        component: SampleView2Component,
        data: {
          name: PageNames.SampleView2
        },
        canActivate: [AuthGuardService]
    }
];

应用活动服务

@Injectable()
export class AppEventsService {
  private _eventStream: Subject<AppEventInterface<any>>;
  private eventNames: Array<string>;

  constructor(private router: Router) {
    this.eventNames = [];
    this._eventStream = new Subject<AppEventInterface<any>>();
    this.registerInternalEvents();
    this.initializeSubscriptions();
  }

 // other member functions here

  get eventStream(): Observable<AppEventInterface<any>> {
    return this._eventStream.asObservable();
  }

  private initializeSubscriptions(): void {
    this.router.events.pipe(
      filter((event: Event) => event instanceof NavigationEnd)
    ).subscribe(() => {
      this.publishEvent<RouterStateSnapshot>({
        name: GlobalAppEvents.RouteChangeComplete,
        type: AppEventTypes.Global,
        data: this.router.routerState.snapshot
      });
    });
  }

}

Analytics服务

@Injectable()
export class AnalyticsService {
  private pageChangeEvents: Observable<AppEventInterface<RouterStateSnapshot>>;
  private userEmailAddress: string;

  constructor(private eventService: AppEventsService,
             @Optional() @Inject(TRACK_ROUTE_CHANGES) private trackRouteChanges: boolean) {

    this.pageChangeEvents = eventService.eventStream.pipe(
      filter((event: AppEventInterface<RouterStateSnapshot>) => this.trackRouteChanges && event.name === GlobalAppEvents.RouteChangeComplete)
    );

    this.initializeSubscriptions();
  }

  private initializeSubscriptions(): void {
    this.pageChangeEvents.subscribe(this.onPageChange.bind(this));
  }

  private onPageChange(routeChangeEvent: AppEventInterface<RouterStateSnapshot>): void {
    const pageName = this.inferPageName(routeChangeEvent.data);
    // do stuff with the page name
  }

  private inferPageName(routerSnapshot: RouterStateSnapshot): string {
    let pageName = 'Undefined';
    let routeNode = routerSnapshot.root;
    while (routeNode) {
      if (routeNode.data.pageName) {
        pageName = routeNode.data.pageName;
        break;
      } else {
        routeNode = routeNode.parent;
      }
    }
    return pageName;
  }
}

上面的代码为每个页面名称生成'Undefined'，因为运行时路由数据的值是一个空对象。

如何构建此体系结构，使每个组件都不需要了解 AppEventsService 和 AnalyticsService ？