angular - RouterModule.forRoot 调用了两次

Question

我正在尝试在我的应用程序中实现延迟加载，但似乎遇到了一个问题，我收到了错误消息:

Error: RouterModule.forRoot() called twice. Lazy loaded modules should use RouterModule.forChild() instead.

所以我有我的主要 app-routing.module.ts 和 app-module.ts，如下所示:

应用模块.ts

// External Dependencies
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

// Internal Dependencies
import { MaterialModule } from '../app/configuration/material/material.module';
import { SharedModule } from '../app/application/shared/shared.module';
import { RoutingModule } from '../app/configuration/routing/routing.module';
import { SettingsModule } from '../app/application/settings/settings.module';

import { AppComponent } from './app.component';

import { SearchService } from './application/shared/services/search.service';

@NgModule({
  declarations: [AppComponent],
  imports: [
    BrowserAnimationsModule,
    BrowserModule,
    SharedModule,
    RoutingModule,
    MaterialModule,
    HttpClientModule,
    FormsModule,
  ],
  providers: [ ],
  bootstrap: [AppComponent]
})

export class AppModule { }

应用程序路由.ts

// External Dependencies
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule, Routes } from '@angular/router';
import { HttpModule } from '@angular/http';

const appRoutes: Routes = [
  { path: '', redirectTo: 'overview', pathMatch: 'full' },
  { path: 'overview', loadChildren: '../../application/overview/overview.module#OverviewModule' },
  { path: 'search', loadChildren: '../../application/search/search.module#SearchModule' },  
  { path: 'policy/:id', loadChildren: '../../application/policy/policy.module#PolicyModule' },
  { path: 'claim/:id', loadChildren: '../../application/claim/claim.module#ClaimModule' },
  { path: 'settings', loadChildren: '../../application/settings/settings.module#SettingsModule' }
];

@NgModule({
  imports: [
    CommonModule,
    RouterModule.forRoot(appRoutes)
  ],
  exports: [
    RouterModule
  ],
  declarations: []
})

export class RoutingModule { }

这工作正常并且应用程序正确加载。这里的问题是，在 SharedModule 中，它有一些组件可以使用 routerLink 将用户重定向到一个新页面。

共享模块.ts

// External Dependencies
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { CalendarModule } from 'primeng/calendar';
import { AgmCoreModule } from '@agm/core';
import { FroalaEditorModule, FroalaViewModule } from 'angular-froala-wysiwyg';
import { PdfViewerModule } from 'ng2-pdf-viewer';

// Internal Dependencies
import { MaterialModule } from '../../configuration/material/material.module';
import { RoutingModule } from '../../configuration/routing/routing.module';

import { NavbarTopComponent } from '../../application/shared/components/navbar-top/navbar-top.component';
import { NavbarSideComponent } from './components/navbar-side/navbar-side.component';
import { TemplateCardWComponent } from './components/template-card-w/template-card-w.component';
import { FilterPipe } from './pipes/filter.pipe';
import { StandardTableComponent } from './components/standard-table/standard-table.component';
import { OrderPipe } from '../shared/pipes/order.pipe';
import { ActionComponent } from './components/action/action.component';
import { GoogleMapComponent } from './components/google-map/google-map.component';
import { HtmlEditorComponent } from './components/html-editor/html-editor.component';
import { PdfViewerComponent } from './components/pdf-viewer/pdf-viewer.component';
import { KeyBindingPipe } from './pipes/key-binding.pipe';
import { StandardEditTableComponent } from './components/standard-edit-table/standard-edit-table.component';

@NgModule({
  imports: [
    CommonModule,
    MaterialModule,
    RoutingModule,
    FormsModule,
    CalendarModule,
    AgmCoreModule,
    FroalaEditorModule,
    FroalaViewModule,
    PdfViewerModule
  ],
  declarations: [
    NavbarTopComponent,
    NavbarSideComponent,
    TemplateCardWComponent,
    FilterPipe,
    StandardTableComponent,
    OrderPipe,
    ActionComponent,
    GoogleMapComponent,
    HtmlEditorComponent,
    PdfViewerComponent,
    KeyBindingPipe,
    StandardEditTableComponent
  ],
  exports: [
  ]
})

export class SharedModule { }

如您所见，我必须导入 RouterModule。如果我删除 RouterModule，应用程序将加载但不会重定向。如果我保留 RouterModule，应用程序将导致问题顶部的错误。

谁能帮我解决这个问题。

Answer 1

我收到这个错误是因为我不小心将根 AppModule 导入了我的延迟加载模块。这导致根 AppRoutingModule 在加载惰性加载模块时再次被调用，因此 RouterModule.forRoot 被调用了两次。

如果您确定您没有调用 RouterModule.forRoot 两次，那么这可能是问题的原因。检查您是否没有在延迟加载的模块中导入任何直接调用 RouterModule.forRoot 的模块或导入调用 RouterModule.forRoot 的模块。