Angular 16 - Issues with Dynamically Injected Services Not Recognizing Singleton Scope
I'm converting an old project and Hey everyone, I'm running into an issue that's driving me crazy. I'm encountering a perplexing issue with Angular 16 regarding the injection of a service that is dynamically loaded into a component. I have a service, `UserService`, which is supposed to maintain a singleton state, but when I inject it into a dynamically created component, it seems to instantiate a new instance instead of using the existing one. This is causing issues with state management across components. Here's the relevant part of my code: ```typescript // user.service.ts import { Injectable } from '@angular/core'; @Injectable({ providedIn: 'root' }) export class UserService { private userData: any = null; setUserData(data: any) { this.userData = data; } getUserData() { return this.userData; } } ``` Next, I have a component that dynamically loads another component using `ComponentFactoryResolver`: ```typescript // main.component.ts import { Component, ComponentFactoryResolver, ViewChild, ViewContainerRef } from '@angular/core'; import { DynamicComponent } from './dynamic.component'; import { UserService } from './user.service'; @Component({ selector: 'app-main', template: `<ng-container #dynamicContainer></ng-container>` }) export class MainComponent { @ViewChild('dynamicContainer', { read: ViewContainerRef }) dynamicContainer!: ViewContainerRef; constructor(private resolver: ComponentFactoryResolver, private userService: UserService) {} loadComponent() { const factory = this.resolver.resolveComponentFactory(DynamicComponent); const componentRef = this.dynamicContainer.createComponent(factory); componentRef.instance.userService = this.userService; } } ``` And the `DynamicComponent` looks like this: ```typescript // dynamic.component.ts import { Component, Input } from '@angular/core'; import { UserService } from './user.service'; @Component({ selector: 'app-dynamic', template: `User Data: {{ userService.getUserData() | json }}` }) export class DynamicComponent { @Input() userService!: UserService; } ``` When I set the user data in the `MainComponent` like this: ```typescript this.userService.setUserData({ name: 'John Doe' }); this.loadComponent(); ``` The `DynamicComponent` is showing `null` for user data instead of the expected object. I’ve verified that `UserService` is indeed provided in root, so it should be a singleton. To troubleshoot, I added logging in `setUserData()` and `getUserData()` methods but they show that the data is being set correctly before the component is loaded. I also tried moving the service injection directly into `DynamicComponent` but met the same issue. What am I missing here? Why is the `DynamicComponent` not able to access the same instance of `UserService`? Is there something about the lifecycle of dynamically loaded components that I need to consider? Any help would be greatly appreciated! I'm working on a application that needs to handle this. Thanks in advance! For reference, this is a production service. Thanks, I really appreciate it! For context: I'm using Typescript on Windows 11. Has anyone else encountered this?