在Angular 2中指定服务的提供者

我得到了什么

低级服务：

服务/角色store.ts

export class RoleStore {
  constructor() {
    // Initialize roles
  }

  getById( id ) {
    // accepts id,returns role object
  }
};

依赖于低级服务的高级服务：

服务/用户store.ts

import {Injectable} from 'angular2/angular2';
import {RoleStore} from './role-store.ts';

@Injectable()
export class UserStore {
  constructor( roleStore: RoleStore ) {
    this.roleStore = roleStore;
    // Initialize users
  }

  roleForUser( user ) {
    let role = this.roleStore.getById( user.roleId );
    return role;
  }
};

依赖于高级服务的组件：

组件/用户dir.ts

import {Component,View,CORE_DIRECTIVES} from 'angular2/angular2';

import {UserStore} from '../services/user-store';

@Component({
  selector: 'user-dir',bindings: [UserStore]
})
@View({
  template: '<!-- inline template -->',directives: [CORE_DIRECTIVES]
})
export class UserDir {
  constructor( data: UserStore ) {
    this.userStore
  }
  // other methods...
}

引导程序的根组件：

app.ts

import {Component,bootstrap} from 'angular2/angular2';

import {RoleStore} from './services/role-store';
import {UserDir} from './components/user-dir';

@Component({
  selector: 'app'
})
@View({
  template: '<user-dir></user-dir>',styleUrls: ['./app.css'],directives: [UserDir]
})
class App {}

bootstrap( App,[RoleStore] );

问题

bootstrap(App,[RoleStore])有效,但我宁愿在user-store.ts中有一个注释,告诉Angular注入RoleStore.

像@Provide(RoleStore)类UserStore {}之类的东西.

任何建议？