Angular 2 : Property injection instead of constructor injection

Question

我可以这样做吗:

export class BaseComponent {
protected config: IConfig;

@Inject(AppConfig) protected appConfig: AppConfig;

constructor() 
{ 
    this.config = this.appConfig.getConfig();    
}

而不是这个:

export class BaseComponent {
config: IConfig;

constructor(
    private appConfig: AppConfig,
    ) 
{ 
    this.config = appConfig.getConfig();    
}

目标是简化构造函数签名，因此所有子组件都不需要在其构造函数中指定 appConfig。所以从 BaseComponent 继承的组件看起来像这样:

@Component({
    selector: 'sport-templates',
    templateUrl: 'templates.component.html',
    styleUrls: [ 'templates.component.scss' ],
    encapsulation: ViewEncapsulation.None
})
export class SportTemplates extends BaseComponent implements OnInit {

    constructor() {
        super();
    }

而是像这样:

@Component({
    selector: 'sport-templates',
    templateUrl: 'templates.component.html',
    styleUrls: [ 'templates.component.scss' ],
    encapsulation: ViewEncapsulation.None
})
export class SportTemplates extends BaseComponent implements OnInit {

    constructor(appConfig: AppConfig) {
        super(appConfig);
     }

Answer 1

你可以这样做:

myService: MyService = this.injector.get(MyService);
constructor(private injector:Injector) {}

注入(inject)器在@angular/core