Angular 将服务注入(inject)基类而不是子类，并在子类中使用父服务

Question

使用 Angular 7 和 Typescript:我有一个使用大量服务和子类(大约 40 个子类)的基类，我不想在所有子类构造函数中添加这些服务并将它们传递给 super() 但我仍然需要在所有子类中使用这些服务。

---

export class parentTool {

    constructor(type: string, public service1: Service1, public service2: Service2,public service3: Service3, public service4: Service4){}
}

export class ChildTool1 extends parentTool {

    constructor(public service1: Service1, public service2: Service2,public service3: Service3, public service4: Service4) {

        super("tool1", service1, service2, service3, service4);
    }
}

export class ChildTool2 extends parentTool {

    constructor(public service1: Service1, public service2: Service2,public service3: Service3, public service4: Service4) {

        super("tool2", service1, service2, service3, service4);
    }
}

Answer 1

我曾经遇到过同样的问题，所以我最终使用 injector 服务进行手动 DI(依赖注入(inject))

此静态类用于存储注入(inject)器服务的引用

export class AppInjector {

  private static injector: Injector;

  static setInjector(injector: Injector) {
    AppInjector.injector = injector;
  }

  static getInjector(): Injector {
    return AppInjector.injector;
  }
}   

在应用程序模块我设置了 injoctor 服务

export class AppModule { 
  constructor(injector:Injector){
      AppInjector.setInjector(injector);// save a injector ref 💾
  }
}

you need to store the service before you start do any DI (dependency injection)

在基础组件中

export class BaseComponent {
  protected utilitiesService: UtilitiesService; // 👈 service
  protected loggingService: LoggingService; // 👈 service

  constructor() {

      const injector = AppInjector.getInjector();

      this.utilitiesService = injector.get(UtilitiesService); // 🌟 DI
      this.loggingService = injector.get(LoggingService); // 🌟 DI


  }

}

子类现在可以访问注入(inject)器类注入(inject)的所有服务 🎉🎉

    export class ChildComponent extends BaseComponent {
      constructor() {
        super();
      }
    }

demo 🔥🔥