角度2:将服务注入到另一个服务. (没有提供程序错误) [英] Angular 2: Inject Service to another service. (No provider error)

问题描述

我想将一项服务注入另一项服务:

I want to inject a service to another service:

@Injectable()

export class Dispatcher {
}


@Injectable()

export class TodoStore {

    constructor(@Inject(Dispatcher) dispatcher:Dispatcher){ 

    }
}

但我总是收到错误消息:Dispatcher没有提供者！

But I always get Error: No provider for Dispatcher!

谢谢.

推荐答案

您需要在某处provide服务.请参考 angular2文档

You need to provide your service somewhere. Please refer to angular2 docs

您可以在bootstrap方法中提供它:

You could provide it in the bootstrap method:

bootstrap(AppComponent,[TodoStore,Dispatcher]);

或应用程序组件:

@Component({
    ...
      providers:[TodoStore,Dispatcher]
}
...

或在任何其他组件中，具体取决于您的需求.

Or in any other component, depending on your needs.

此外，您无需在构造函数中使用@Inject(Dispatcher).基本上和

Also, you don't need to @Inject(Dispatcher) in the constructor. It's basically the same as

constructor(dispacher:Dispatcher){
}

哦，是的，欢迎来到SO:)

Oh yeah, welcome to SO :)

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