Injections only works with classes that are instantiated by Angulars dependency injection (DI).
- You need to
- add
@Injectable()
toMyClass
and - provide
MyClass
likeproviders: [MyClass]
in a component or NgModule.
- add
When you then inject MyClass
somewhere, a MyService
instance gets passed to MyClass
when it is instantiated by DI (before it is injected the first time).
- An alternative approach is to configure a custom injector like
constructor(private injector:Injector) {
let resolvedProviders = ReflectiveInjector.resolve([MyClass]);
let childInjector = ReflectiveInjector.fromResolvedProviders(resolvedProviders, this.injector);
let myClass : MyClass = childInjector.get(MyClass);
}
This way myClass
will be a MyClass
instance, instantiated by Angulars DI, and myService
will be injected to MyClass
when instantiated.
See also Getting dependency from Injector manually inside a directive
- Yet another way is to create the instance yourself:
constructor(ms:myService)
let myClass = new MyClass(ms);