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When you add a service provider to root module (root injector), it is available for whole application. That means if you have a feature module with service in providers and that service is also provided in root module, in this case both modules will work with the same instance of service (singleton pattern). providedIn: 'root'}) export class SharedService {constructor {}} In the @Injectable decorator we have a new property called providedIn. With this property we can tell Angular which module to register our service to instead of having to import the module and register it to the providers of a NgModule.
[Перевод] Angular 6+ полное руководство по внедрению зависимостей. providedIn vs providers:[] 03.12.2018 23:34 В Angular 6 появился новый улучшенный синтаксис для внедрения зависимостей сервисов в приложение (provideIn). 使用providedIn: 'root', 'root'将会正常工作，服务也会被正确捆绑，但是使用 providedIn: LazyServiceModule 为我们提供了早期的“missing provider”错误，这是一个很好的早期信号，这有助于我们重新思考我们的架构。 什么时候使用老的 providers:[] 语法？ 当providedIn是null的时候。咱们仅仅是告诉了系统这个类是可注入的。在其他的地方还使用不了。如果想使用需要在NgModule装饰器或者Component装饰器里面的元数据providers中指定。 1.1.2.1 providedIn: 'root' providedIn: 'root'。 使用providedIn: 'root' , 'root'将会正常工作，服务也会被正确捆绑，但是使用 providedIn: LazyServiceModule 为我们提供了早期的“missing provider”错误，这是一个很好的早期信号，这有助于我们重新思考我们的架构。 什么时候使用老的 providers:[] 语法？ providedIn: 'root' 告诉 Angular在根注入器中注册这个服务,这也是使用CLI生成服务时默认的方式. 这种方式注册,不需要再@NgModule装饰器中写providers,而且在代码编译打包时,可以执行摇树优化，会移除所有没在应用中使用过的服务。 Angular is a platform for building mobile and desktop web applications. Join the community of millions of developers who build compelling user interfaces with Angular.
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Whenever providedIn: 'root'}) export class SharedService {constructor {}} In the @Injectable decorator we have a new property called providedIn. With this property we can tell Angular which module to register our service to instead of having to import the module and register it to the providers of a NgModule.
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For some services however you need to make sure that they are real singletons, meaning that there is only one instance in the whole application. Providers for services are usually the service class itself and you would usually use the providedIn shortcut to provide the service in the root injector. This feature is not available right now.
In order to increase the capability for frequency support to nomical impact from the provider or owner of such a service.
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regarding currency risks is provided in Note 28. The term “social network service” may include a service provider that builds online WiFi, Bluetooth®, and/or USB connectivity 456, which can be provided in, for The desktop manager 1012 can use a root window to create panels that can US20020126876A1 (en), 1999-08-10, 2002-09-12, Paul George V. Tracking
providedIn: 'root'. }) The app.component.ts is the root as the application loads: from '@angular/core'; @Component({ selector: 'app-root', templateUrl: '.
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Whenever providedIn: 'root'}) export class SharedService {constructor {}} In the @Injectable decorator we have a new property called providedIn. With this property we can tell Angular which module to register our service to instead of having to import the module and register it to the providers of a NgModule. By default, this syntax registers it to the root injector which will make our service an application wide singleton.