如何将多个DataServices传递给Angular 2中的组件构造函数？

Question

我想将多个DataServices传递给组件构造函数。目前我可以逐个传递它们，但我希望能够以更通用的方式将它们作为数组传递。

export class MainGrid {

    constructor(private firstService: FirstDataService, private secondService: SecondDataService) { }
    // how to do this instead -> constructor(private services: BaseDataService[] ) { }

    ngOnInit() {
      this.firstService.getData().then(data => {
        // do something with data
      });

      this.secondService.getData().then(data => {
        // do something with data
      });

      // how to do this instead ->
      this.services.map((service) => {
        service.getData().then(data => {
          // do something with data
        }
      });

    }
}

以下是我对BaseDataService

的看法

import {Injectable} from '@angular/core';
import {Http, Response} from '@angular/http';
import {Data} from '../../app/data/data';


export abstract class BaseDataService {

    constructor() {}

    abstract getData()
}

@Injectable()
export class FirstDataService implements BaseDataService{

    constructor(private http: Http) {}

    getData() {
        return this.http.get('app/resources/data/cars-medium.json')
                    .toPromise()
                    .then(res => <Data[]> res.json().data)
                    .then(data => { return data; });
    }
}

@Injectable()
export class SecondDataService implements BaseDataService {

    constructor(private http: Http) {}

    getData() {
        return this.http.get('app/resources/data/cars-medium.json')
                    .toPromise()
                    .then(res => <Data[]> res.json().data)
                    .then(data => { 
                        return {
                            foo: 'bar'
                        }
                    });
    }
}

所以我的问题是如何以及在何处将BaseDataService数组传递给MainGrid组件构造函数？