angular - 错误静态注入(inject)器 : StaticInjectorError(AppModule)[GameService -> HttpClient]

Question

我对 Angular 中的库有疑问。我已经完成了一个库，我在其中使用 HttpClient 询问 API 但是有一个问题，当我尝试从这个库 GameService 继续上课时，我收到:“Error Static Injector: StaticInjectorError(AppModule)[GameService -> HttpClient]” .当我看到它时，我尝试在我的应用程序中导入 HttpModule 并添加提供者 HttpClient 但没有任何改变。这是我的类库的代码:

import { Injectable } from '@angular/core';
import { HttpHeaders, HttpClient } from '@angular/common/http';
import { Game } from './model/game';
import { Observable } from 'rxjs';
import { EndPointGetterService } from '../utilities/end-point-getter.service';

@Injectable({
  providedIn: 'root'
})
export class GameService {

  private gameUrl = localStorage.getItem('endpoint') + '/Games';
  private headers: HttpHeaders;

  constructor(private http: HttpClient, private EPGetter: EndPointGetterService) {
    this.headers = new HttpHeaders({
      'Access-Control-Allow-Origin': 'http://localhost:4200',
      'Access-Control-Allow-Methods': 'GET,PUT,POST,DELETE,OPTIONS',
      'Access-Control-Allow-Headers': '*',
    });
  }
  getStateGame(groupName: string): Observable<number> {
    return this.http.get<number>(this.EPGetter.getEndPointUrl() + '/Games/' + groupName + '/State', { headers: this.headers });
  }

在我的应用程序中，我的 app.module.ts 中有这个:

import { HttpClientModule, HttpClient } from '@angular/common/http';
import { GameService } from '@oneroomic/oneroomlibrary';

@NgModule({
  declarations: [
    AppComponent,
    NavComponent,
    LockscreenComponent,
    SettingsComponent
  ],
  imports: [
    HttpClientModule,
  ],
  providers: [
    HttpClient,
    GameService
  ],

这就是我注入(inject) GameService 的方式:

constructor(
  private snackBar: MatSnackBar,
  private gameService: GameService
  ) {}

Answer 1

尝试从 providedIn: 'root' 中移除 GameService。那里也不需要 HttpClient