Angular 6 Material - 组件不是已知元素

Question

我正在尝试在我的 Angular 6 应用程序中安装 Material Design。我使用命令 ng generate @angular/material:nav myNav 添加了导航示意图。当我编译并提供应用程序时，出现错误

Uncaught Error: Template parse errors: 'my-nav' is not a known element: 1. If 'my-nav' is an Angular component, then verify that it is part of this module.

我的 app.modules.ts 代码如下:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { LayoutModule } from '@angular/cdk/layout';
import { MatToolbarModule, MatButtonModule, MatSidenavModule, MatIconModule, MatListModule } from '@angular/material';
import { MyNavComponent } from './my-nav/my-nav.component';

@NgModule({
  declarations: [
    AppComponent,
    MyNavComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    BrowserAnimationsModule,
    LayoutModule,
    MatToolbarModule,
    MatButtonModule,
    MatSidenavModule,
    MatIconModule,
    MatListModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

我的app.component.html代码如下:

<my-nav></my-nav>

请告诉我哪里出错了。

Answer 1

因为它是:

@Component({
  selector: 'app-my-nav',
  templateUrl: './my-nav.component.html',
  styleUrls: ['./my-nav.component.css']
})

您的选择器是 app-my-nav , 因此它是 <app-my-nav></app-my-nav> :

selector identifies this directive in a template and triggers instantiation of the directive.