'router-outlet' 不是已知元素

Question

我有一个带有角度前端的 mvc 5 项目。我想按照本教程 https://angular.io/guide/router 中的描述添加路由。所以在我的 _Layout.cshtml 我加了一个

<base href="/">

并在我的 app.module 中创建了我的路由。但是当我运行它时，我收到以下错误：

 Error: Template parse errors:
    'router-outlet' is not a known element:
    1. If 'router-outlet' is an Angular component, then verify that it is part       of this module.
    2. If 'router-outlet' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA'   to the '@NgModule.schemas' of this component to suppress this message. ("
    <a routerLink="/dashboard">dashboard</a>
    </nav>
    [ERROR ->]<router-outlet></router-outlet>
     "): ng:///AppModule/AppComponent.html@5:0

在我的 app.component 行

<router-outlet></router-outlet>

给出一个错误，告诉我 Visual Studio 无法解析标签“路由器插座”。有什么建议可以解决这个错误吗？我是否缺少参考或导入或只是忽略了某些东西？

下面是我的 package.json 、app.component 和 app.module

package.json :

 {
    "version": "1.0.0",
    "name": "app",
    "private": true,
    "scripts": {},
    "dependencies": {
    "@angular/common": "^4.2.2",
    "@angular/compiler": "^4.2.2",
    "@angular/core": "^4.2.2",
    "@angular/forms": "^4.2.2",
    "@angular/http": "^4.2.2",
    "@angular/platform-browser": "^4.2.2",
    "@angular/platform-browser-dynamic": "^4.2.2",
    "@angular/router": "^4.2.2",
    "@types/core-js": "^0.9.41",
    "angular-in-memory-web-api": "^0.3.2",
    "bootstrap": "^3.3.7",
    "core-js": "^2.4.1",
    "graceful-fs": "^4.0.0",
    "ie-shim": "^0.1.0",
    "minimatch": "^3.0.4",
    "reflect-metadata": "^0.1.10",
    "rxjs": "^5.0.1",
    "systemjs": "^0.20.12",
    "zone.js": "^0.8.12"
    },
    "devDependencies": {
    "gulp": "^3.9.1",
    "gulp-clean": "^0.3.2",
    "gulp-concat": "^2.6.1",
    "gulp-tsc": "^1.3.2",
    "gulp-typescript": "^3.1.7",
    "path": "^0.12.7",
    "typescript": "^2.3.3"
    }
}

app.module.ts :

 import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { RouterModule, Routes } from '@angular/router';

import { AppComponent } from './app.component';
import {DashboardComponent} from "./dashboard/dashboard.component"

const appRoutes: Routes = [
{
    path: '',
    redirectTo: '/dashboard',
    pathMatch: 'full',
    component: DashboardComponent
},
{
    path: 'dashboard',
    component: DashboardComponent
}
];
@NgModule({
imports: [
    RouterModule.forRoot(appRoutes),
    BrowserModule,
    FormsModule
],
exports: [RouterModule],
declarations: [
    AppComponent,
    DashboardComponent
],
bootstrap: [AppComponent]
})
export class AppModule {

}

app.component.ts ：

 import { Component } from '@angular/core';

@Component({
selector: 'my-app',
template: `
          <h1>{{title}}</h1>
          <nav>
          <a routerLink="/dashboard">dashboard</a>
          </nav>
          <router-outlet></router-outlet>
          `
})
export class AppComponent {
    title = 'app Loaded';

}

原文由 Molo 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

尝试：

 @NgModule({
  imports: [
      BrowserModule,
      RouterModule.forRoot(appRoutes),
      FormsModule
  ],
  declarations: [
      AppComponent,
      DashboardComponent
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

不需要在 AppModule 中配置导出，因为 AppModule 不会被应用程序中的其他模块导入。

原文由 Jota.Toledo 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 2

确保以下几点来解决此问题：

1. 将 RouterModule 模块导入模块。
2. 将组件 where 添加到模块中的声明数组中。
3. 如果您明确定义它，请确保您导入了路由器模块。

请参阅以下示例：

app.component.html

 <router-outlet></router-outlet>

应用程序路由.module.ts

 import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { AboutUsComponent } from './components/about-us/about-us.component';
import { ContactUsComponent } from './components/contact-us/contact-us.component';
import { IndexComponent } from './components/index/index.component';
const routes: Routes = [
{ path: '', redirectTo: 'index', pathMatch: 'full' },
{ path: 'index', component: IndexComponent },
{ path: 'about-us', component: AboutUsComponent },
{ path: 'contact-us', component: ContactUsComponent }
];
@NgModule({
imports: [
    RouterModule.forRoot(routes, { relativeLinkResolution: 'legacy' })
],
exports: [
    RouterModule
],
providers: []
})
export class AppRoutingModule { }

app.module.ts：

 import { NgModule} from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { IndexComponent } from './components/index/index.component';
import { AboutUsComponent } from './components/about-us/about-us.component';
import { ContactUsComponent } from './components/contact-us/contact-us.component';
import { FormsModule } from '@angular/forms';
import { RouterModule } from '@angular/router';
import { CommonModule } from '@angular/common';

@NgModule({
  imports: [
CommonModule,
FormsModule,
RouterModule,
BrowserModule,
BrowserAnimationsModule,
AppRoutingModule,
 ],
declarations: [AppComponent, IndexComponent, AboutUsComponent, ContactUsComponent],
providers: [],
bootstrap: [AppComponent],
})
export class AppModule {}

它正在和我一起工作！！！

原文由 Mohammed Altaf 发布，翻译遵循 CC BY-SA 4.0 许可协议