Angular2 Material 对话框有问题 - 你是否将它添加到@NgModule.entryComponents？

Question

我正在尝试关注 https://material.angular.io/components/component/dialog 上的文档但我不明白为什么会出现以下问题？

我在组件中添加了以下内容:

@Component({
  selector: 'dialog-result-example-dialog',
  templateUrl: './dialog-result-example-dialog.html',
})
export class DialogResultExampleDialog {
  constructor(public dialogRef: MdDialogRef<DialogResultExampleDialog>) {}
}

在我的模块中我添加了

import { HomeComponent,DialogResultExampleDialog } from './home/home.component';

@NgModule({
  declarations: [
    AppComponent,
    LoginComponent,
    DashboardComponent,
    HomeComponent,
    DialogResultExampleDialog
  ],

// ...

但是我得到这个错误......

EXCEPTION: Error in ./HomeComponent class HomeComponent - inline template:53:0 caused by: No component factory found for DialogResultExampleDialog. Did you add it to @NgModule.entryComponents?
    ErrorHandler.handleError @ error_handler.js:50
    next @ application_ref.js:346
    schedulerFn @ async.js:91
    SafeSubscriber.__tryOrUnsub @ Subscriber.js:223
    SafeSubscriber.next @ Subscriber.js:172
    Subscriber._next @ Subscriber.js:125
    Subscriber.next @ Subscriber.js:89
    Subject.next @ Subject.js:55
    EventEmitter.emit @ async.js:77
    NgZone.triggerError @ ng_zone.js:329
    onHandleError @ ng_zone.js:290
    ZoneDelegate.handleError @ zone.js:246
    Zone.runTask @ zone.js:154
    ZoneTask.invoke @ zone.js:345
    error_handler.js:52 ORIGINAL EXCEPTION: No component factory found for DialogResultExampleDialog. Did you add it to @NgModule.entryComponents?
    ErrorHandler.handleError @ error_handler.js:52
    next @ application_ref.js:346
    schedulerFn @ async.js:91
    SafeSubscriber.__tryOrUnsub @ Subscriber.js:223
    SafeSubscriber.next @ Subscriber.js:172
    Subscriber._next @ Subscriber.js:125
    Subscriber.next @ Subscriber.js:89
    Subject.next @ Subject.js:55
    EventEmitter.emit @ async.js:77
    NgZone.triggerError @ ng_zone.js:329
    onHandleError @ ng_zone.js:290
    ZoneDelegate.handleError @ zone.js:246
    Zone.runTask @ zone.js:154
    ZoneTask.invoke @ zone.js:345

Answer 1

Angular 9.0.0 <

Since 9.0.0 with Ivy, the entryComponents property is no longer necessary. See deprecations guide.

Angular 9.0.0 >

您需要将动态创建的组件添加到 @NgModule 中的 entryComponents

@NgModule({
  declarations: [
    AppComponent,
    LoginComponent,
    DashboardComponent,
    HomeComponent,
    DialogResultExampleDialog        
  ],
  entryComponents: [DialogResultExampleDialog]

注意:在某些情况下，惰性加载模块 下的 entryComponents 将不起作用，因为解决方法是将它们放在您的 app 中。模块(根)