Question

是否可以将InjectionToken注入工厂提供者：

目前，我已编码：

export const HOST_TOKEN = new InjectionToken<string>("host");

let configDataServiceFactory = (userService: UserService, host: string) => {
    return new Config("host", 8080, userService.getUser(), userService.getPasswd());
};

export let configDataServiceProvider =
{
    provide: CONFIG_API,
    useFactory: configDataServiceFactory,
    deps: [UserService, HOST_TOKEN]
};

进入我的模块：

@NgModule(
  providers: [
    {provide: HOST_TOKEN, useValue: "allianz-host"},
    configDataServiceProvider
  ]
)

尽管如此，角度注入configDataServiceProvider值"host"，而不是"host-allianz"

有什么想法吗？

Answer 1

是的，你可以使用下面的@Inject装饰器来做到这一点，这将帮助你从DI容器中提取相关的依赖。

let configDataServiceFactory = (userService: UserService, @Inject(HOST_TOKEN) host: string) => {
    return new Config(host, 8080, userService.getUser(), userService.getPasswd());
};

您也可以考虑以下选项。基本上所有已注册的InjectionToken都可以从应用程序Injector中检索，这可以通过在get实例上调用injector方法并传递InjectorToken名称来实现

export const HOST_TOKEN = new InjectionToken<string>("host");

let configDataServiceFactory = (userService: UserService, injector: Injector) => {
    let host = injector.get(HOST_TOKEN); //retrieved token from injector
    return new Config(host, 8080, userService.getUser(), userService.getPasswd());
};

export let configDataServiceProvider =
{
    provide: CONFIG_API,
    useFactory: configDataServiceFactory,
    deps: [UserService, Injector]
};

Docs Here

Angular DI：将值令牌注入工厂提供程序

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