Question

出于某种原因，我不想使用构造函数（私有http：Http）DI。

看着https://angular.io/docs/ts/latest/api/http/index/Http-class.html

并尝试了

const injector = ReflectiveInjector.resolveAndCreate([
  BaseRequestOptions,
  XHRConnection,
  {
    provide: Http,
    useFactory: (backend, defaultOptions) => new Http(backend, defaultOptions),
    deps: [XHRConnection, BaseRequestOptions]
  }
]);

this.http = injector.get(Http);

错误说

原始例外：无法解析＆＃39; XHRConnection＆＃39;（？，？，？）的所有参数。确保所有参数都使用Inject进行修饰或具有有效的类型注释以及“XHRConnection”。用Injectable装饰。

Answer 1

您需要提供HTTP_PROVIDERS：

const injector = ReflectiveInjector.resolveAndCreate([
  HTTP_PROVIDERS,
  XHRConnection,
  {
    provide: Http,
    useFactory: (backend, defaultOptions) => new Http(backend, defaultOptions),
    deps: [XHRConnection, BaseRequestOptions]
  }
]);

Answer 2

实际上，它可以像

一样简单

const injector = ReflectiveInjector.resolveAndCreate([
  HTTP_PROVIDERS
]);

this.http = injector.get(Http);

基于GünterZöchbauer的回答。

如何在不使用构造函数DI的情况下创建Http实例？

2 个答案: