Collaborative service utilization in Angular 2

My goal is to create a shared service for my app.

import { Injectable } from '@angular/core';

@Injectable()
export class SharedService {
  testService() {
    console.log('share!');
  }
}

However, when I attempt to inject this shared service in my app.component's providers and call it in the constructor of a child component like so:

constructor(public sharedService: SharedService) {}
, I encounter an error stating:
Can't resolve all parameters for MyComponent
. This error persists even if I try to inject the service in my app.module providers. What steps should I take to resolve this issue? Can someone provide an example of how to correctly inject a shared service for the entire app (which consists of multiple modules)?

In addition, with a routing system in place, I aim to have a shared service that allows me to modify its data from the component representing the current module.

Answer №1

It is important to ensure you are using the most recent version and wish to utilize a singleton service. To achieve this, you need to register your service within @NgModule({}), as demonstrated below:

import {Sharedservice} from 'valid path';

@NgModule({
   imports:[BroswerModule],
   ...
   providers:[SharedService]
})

Subsequently, in both child and parent components, simply import Sharedservice at the beginning of the file.

NOTE : Remember to eliminate providers:[SharedService] from each component.

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