“路由器出口”不是已知元素

我有一个带有尖角前端的mvc 5项目。我想按照本教程https://angular.io/guide/router中的描述添加路由。所以在我中_Layout.cshtml我添加了一个

<base href="/">

并在我的app.module中创建了路由。但是当我运行它时，出现以下错误：

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中

<router-outlet></router-outlet>

出现错误，告诉我Visual Studio无法解析标记“ router-outlet”。有什么建议可以解决此错误吗？我是否缺少参考文献或进口商品，或者只是忽略了某些东西？

以下是我的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';

}

尝试：

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

无需在中配置导出AppModule，因为AppModule不会被应用程序中的其他模块导入。

试试这个：

导入RouterModule到您的app.module.ts

import { RouterModule } from '@angular/router';

添加RouterModule到您的imports []

像这样：

 imports: [    RouterModule,  ]

如果您正在进行单元测试并出现此错误，请导入RouterTestingModule到您app.component.spec.ts的特征部件中或内部spec.ts：

import { RouterTestingModule } from '@angular/router/testing';

加入RouterTestingModule您的imports: []喜欢

describe('AppComponent', () => {

  beforeEach(async(() => {    
    TestBed.configureTestingModule({    
      imports: [    
        RouterTestingModule    
      ],
      declarations: [    
        AppComponent    
      ],    
    }).compileComponents();    
  }));

假设您将Angular 6与angular-cli一起使用，并且创建了一个单独的路由模块来负责路由活动-在Routes数组中配置路由，请确保在exports数组中声明RouterModule。代码如下所示：

@NgModule({
      imports: [
      RouterModule,
      RouterModule.forRoot(appRoutes)
     // other imports here
     ],
     exports: [RouterModule]
})
export class AppRoutingModule { }

当我在app.module.ts中添加以下代码时，它对我有用

@NgModule({
...,
   imports: [
     AppRoutingModule
    ],
...
})

谢谢Hero编辑器示例，在其中找到了正确的定义：

当我生成应用程序路由模块时：

ng generate module app-routing --flat --module=app

并更新app-routing.ts文件以添加：

@NgModule({
  imports: [ RouterModule.forRoot(routes) ],
  exports: [ RouterModule ]
})

这是完整的示例：

import { NgModule }             from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

import { DashboardComponent }   from './dashboard/dashboard.component';
import { HeroesComponent }      from './heroes/heroes.component';
import { HeroDetailComponent }  from './hero-detail/hero-detail.component';

const routes: Routes = [
  { path: '', redirectTo: '/dashboard', pathMatch: 'full' },
  { path: 'dashboard', component: DashboardComponent },
  { path: 'detail/:id', component: HeroDetailComponent },
  { path: 'heroes', component: HeroesComponent }
];

@NgModule({
  imports: [ RouterModule.forRoot(routes) ],
  exports: [ RouterModule ]
})
export class AppRoutingModule {}

并将AppRoutingModule添加到app.module.ts导入中：

@NgModule({
  declarations: [
    AppComponent,
    ...
  ],
  imports: [
    BrowserModule,
    FormsModule,
    AppRoutingModule
  ],
  providers: [...],
  bootstrap: [AppComponent]
})

创建一个可以处理所有路由的路由组件会更好！从有角度的网站文档中！那是好习惯！

ng生成模块应用程序路由--flat --module = app

上面的CLI生成了一个路由模块，并将其添加到您的应用程序模块中，您需要从生成的组件中进行的所有操作就是声明您的路由，也不要忘记添加以下内容：

exports: [
    RouterModule
  ],

到您的ng-module装饰器，因为默认情况下它不随生成的应用程序路由模块一起提供！

有两种方法。1.如果要实现app.module.ts文件，则：

import { Routes, RouterModule } from '@angular/router';

const appRoutes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'user', component: UserComponent },
  { path: 'server', component: ServerComponent }
];

@NgModule({
  imports: [
    RouterModule.forRoot(appRoutes)
  ]
})
export class AppModule { }

2. 如果要实现app-routing.module.ts（分离路由模块）文件，则：

//app-routing.module.ts
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

const appRoutes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'users', component: UsersComponent },
  { path: 'servers', component: ServersComponent }
];

@NgModule({
  imports: [
    RouterModule.forRoot(appRoutes)
  ],
  exports: [RouterModule]
})
export class AppRoutingModule { }

//................................................................

//app.module.ts
import { AppRoutingModule } from './app-routing.module';

@NgModule({
  imports: [
    AppRoutingModule
  ]
})
export class AppModule { }

这个问题也和我有关。简单的把戏。

 @NgModule({
  imports: [
   .....       
  ],
 declarations: [
  ......
 ],

 providers: [...],
 bootstrap: [...]
 })

按照上面的顺序使用它。先导入然后声明。它对我有用。

在您的app.module.ts文件中

import { RouterModule, Routes } from '@angular/router';

const appRoutes: Routes = [
{
    path: '',
    redirectTo: '/dashboard',
    pathMatch: 'full',
    component: DashboardComponent
},  
{
    path: 'dashboard',
    component: DashboardComponent
}
];

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

}

添加此代码。编码愉快。

如果有人遇到错误，这里是快速简单的解决方案：

“ Angular工程中的“路由器出口”不是已知元素”，

然后，

只需转到“ app.module.ts”文件并添加以下行：

import { AppRoutingModule } from './app-routing.module';

以及导入中的“ AppRoutingModule”。