Angular 错误 : no provider for ActivatedRoute

Question

我正在使用最新的 Angular 5，并且遇到以下异常

ERROR Error: StaticInjectorError(AppModule)[AppComponent -> ActivatedRoute]: 
  StaticInjectorError(Platform: core)[AppComponent -> ActivatedRoute]: 
    NullInjectorError: No provider for ActivatedRoute!
    at _NullInjector.get (core.js:1002)
    at resolveToken (core.js:1300)
    at tryResolveToken (core.js:1242)
    at StaticInjector.get (core.js:1110)
    at resolveToken (core.js:1300)
    at tryResolveToken (core.js:1242)
    at StaticInjector.get (core.js:1110)
    at resolveNgModuleDep (core.js:10854)
    at NgModuleRef_.get (core.js:12087)
    at resolveDep (core.js:12577)

app.module.ts 如下所示从 '@angular/router' 导入 { Routes, RouterModule };

@NgModule({
  declarations: [
    AppComponent,
    OptyDetailsComponent,
    GlobalNavbarComponent
  ],
  imports: [
    BrowserAnimationsModule,
    BrowserModule,
    HttpModule,
    HttpClientModule,
    FlexLayoutModule,
    FormsModule,
    MatButtonModule,
    MatInputModule
    RouterModule
  ],
  entryComponents: [
  ], 
  providers: [
    DataStoreService,
    DataObjectsOscService,
    AdobeSignService,
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Answer 1

为了能够将 ActivatedRoute 提供到您的 Angular 元素中，您需要将调用 RouterModule.forRoot 的结果导入到您的根模块 (AppModule) 中。这是因为 RouterModule.forRoot 返回的模块包含 ActivatedRoute 实例的提供程序等。

所以基本上您需要将以下内容添加到根模块中的导入中:

@NgModule({
  ...
  imports: [
    ...
    // Remark: because you havent defined any routes, I have to pass an empty
    // route collection to forRoot, as the first parameter is mandatory.
    RouterModule.forRoot([]),
    ...
  ],
  ...
})
export class AppModule { }

但老实说，尽管您还没有为根模块定义任何路由，但您使用 ActivatedRoute 有点奇怪。

更多细节见:

ActivatedRoute provider source

RouterModule.forRoot() source