Question

我想使用ReflectiveInjector解析Http而不是通过在构造函数中注入。

以下是我的代码

import { ReflectiveInjector } from '@angular/core';
import { HttpClient, HttpClientModule } from '@angular/common/http';


private http;

constructor()
{
    let injector = ReflectiveInjector.resolveAndCreate([
        (<any>HttpClientModule).decorators[0].args[0].providers
    ]);
    this.http = injector.get(HttpClient);
    console.log(this.http)
}

当我使用ng服务时它工作正常，但是当我构建项目时它会抛出错误，无法读取属性＆＃39; 0＆＃39;未定义的。

注意：我正在开发Angular 5项目。

Answer 1

您需要列出注射器中的所有提供商，例如 HttpModule ：

let injector = ReflectiveInjector.resolveAndCreate([
    {provide: Http, useFactory: httpFactory, deps: [XHRBackend, RequestOptions]},
    BrowserXhr,
    {provide: RequestOptions, useClass: BaseRequestOptions},
    {provide: ResponseOptions, useClass: BaseResponseOptions},
    XHRBackend,
    {provide: XSRFStrategy, useFactory: _createDefaultCookieXSRFStrategy},
  ])

另见https://github.com/angular/angular/blob/master/packages/http/src/http_module.ts#L46-L55

StackBlitz example

HttpClientModule 的提供者可在https://github.com/angular/angular/blob/c8a1a14b87e5907458e8e87021e47f9796cb3257/packages/common/http/src/module.ts#L119-L132

中找到

如何使用ReflectiveInjector解决角度5中的HTTP依赖性

1 个答案: