Angular 16: Issues with Dependency Injection in Nested Components and Dynamic Module Loading
I'm facing a rather perplexing issue with Angular 16 regarding dependency injection in nested components. I have a main component that loads a child component dynamically using `ViewContainerRef`. The child component is supposed to inject a service that is provided in the main component. However, I get an error indicating that the service is not found when trying to access it in the child component. Here's what my structure looks like: ```typescript // main.component.ts import { Component, ViewChild, ViewContainerRef, ComponentFactoryResolver } from '@angular/core'; import { ChildComponent } from './child.component'; import { MyService } from './my.service'; @Component({ selector: 'app-main', template: `<button (click)="loadChild()">Load Child</button><ng-container #childContainer></ng-container>` }) export class MainComponent { @ViewChild('childContainer', { read: ViewContainerRef }) childContainer!: ViewContainerRef; constructor(private resolver: ComponentFactoryResolver, private myService: MyService) {} loadChild() { const factory = this.resolver.resolveComponentFactory(ChildComponent); const componentRef = this.childContainer.createComponent(factory); componentRef.instance.service = this.myService; // Attempting to pass service } } ``` And in the child component: ```typescript // child.component.ts import { Component, Input } from '@angular/core'; import { MyService } from './my.service'; @Component({ selector: 'app-child', template: `<p>{{ service.getData() }}</p>` }) export class ChildComponent { @Input() service!: MyService; } ``` When I try to load the child component, I receive the following error: ``` ERROR Error: StaticInjectorError[ChildComponent]: StaticInjectorError[ChildComponent]: NullInjectorError: No provider for MyService! ``` I've verified that `MyService` is correctly provided in the `providers` array of the `MainComponent`, and that should ideally make it accessible to the child component. I also tried using `providers: [MyService]` in the `ChildComponent`, but that resulted in the service being instantiated multiple times, which isn’t the desired behavior. Is there a better way to ensure that the injected service in the child component doesn't return a `NullInjectorError`? Any insights into how Angular handles dependency injection in dynamically loaded components would be greatly appreciated!