2019年6月5日本文由达观数据研究院根据《Total Guide To Angular 6+ Dependency Injection — providedIn vs providers》编译，如有不当，还请指正。

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providedIn? Determines which injectors will provide the injectable, by either associating it with an @NgModule or other InjectorType, or by specifying that this injectable should be provided in one of the following injectors: 'root' : The application-level injector in most apps. The service itself is a class that the CLI generated and that's decorated with @ Injectable (). By default, this decorator has a providedIn property, which creates a provider for the service. In this case, providedIn: 'root' specifies that Angular should provide the service in the root injector. What kinds of problems can be solved using providedIn?

Providedin

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Angular Interview Question: providedIn vs providers Array, Pre Angular 6 **. The only way to define providers was with the providers array. Services were singletons in eagerly loaded modules but could The providedIn property tells the Angular dependency injection with the "scope" of our service in the application i.e where it can be provided.

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2020-08-24 · @Injectable({ providedIn: 'root', }) Let’s continue our work with the environment files by modifying the environment-url.service.ts file:

All the rights are The guidance is provided in paragraphs 2 through to 19.

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We will implement and use the Firebase auth platform in Angular application to build a robust Login and Signup system. Our user authentication application covers the following … It is mostly recommended to have any service available application-wide by using either @Injectable({providedIn: 'root'}) OR by adding to providers of AppModule, unless there is a strong reason to add it only in some component or in some lazy loaded module. 2020-08-24 · @Injectable({ providedIn: 'root', }) Let’s continue our work with the environment files by modifying the environment-url.service.ts file: Se hela listan på offering.solutions The providedIn attribute makes it possible to register a service directly inside the @Injectable() decorator. It is no longer necessary to register a service in @NgModule(). providedIn: ‘root’ tells Angular to register the service as a singleton in the application root (equivalent to @NgModule({ providers: [ MessageService ]}) Tip: Share your reusable components between projects using Bit ().

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The providedIn: ‘root’ metadata field of @Injectable provides the most recommended approach. This metadata field released with Angular 6. As mentioned before, providedIn: ‘root’ registers a service with the root module injector. It is instantiable across the entire application as a result. The novelty of providedIn: ‘root’ is tree

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