I have been reading a lot of articles explaining how to set up Entity Framework’s DbContext so that only one is created and used per HTTP web request using various DI frameworks. Why is this a good idea in the first place? What advantages do you gain by using this approach? Are there certain situations … Read more
How do I manually resolve a type using the ASP.NET Core MVC built-in dependency injection framework? Setting up the container is easy enough: public void ConfigureServices(IServiceCollection services) { // … services.AddTransient<ISomeService, SomeConcreteService>(); } But how can I resolve ISomeService without performing injection? For example, I want to do this: ISomeService service = services.Resolve<ISomeService>(); There are … Read more
I’ve built a basic app in Angular, but I have encountered a strange issue where I cannot inject a service into one of my components. It injects fine into any of the three other components I have created, however. For starters, this is the service: import { Injectable } from ‘@angular/core’; @Injectable() export class MobileService … Read more
Most of the examples quoted for usage of Dependency Injection, we can solve using the factory pattern as well. Looks like when it comes to usage/design the difference between dependency injection and factory is blurred or thin. Once someone told me that its how you use it that makes a difference! I once used StructureMap … Read more
I’m trying to understand dependency injections (DI), and once again I failed. It just seems silly. My code is never a mess; I hardly write virtual functions and interfaces (although I do once in a blue moon) and all my configuration is magically serialized into a class using json.net (sometimes using an XML serializer). I … Read more
Closed. This question is opinion-based. It is not currently accepting answers. Closed 8 years ago. Locked. This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. I’ve been using Dependency Injection (DI) for a while, injecting either in a constructor, … Read more
According to the paper written by Martin Fowler, inversion of control is the principle where the control flow of a program is inverted: instead of the programmer controlling the flow of a program, the external sources (framework, services, other components) take control of it. It’s like we plug something into something else. He mentioned an … Read more
I am going through some blogs on SpringSource and in one of the blogs, author is using @Inject and I suppose he can also use @Autowired. Here is the piece of code: @Inject private CustomerOrderService customerOrderService; I am not sure about the difference between @Inject and @Autowired and would appreciate it if someone explained their … Read more
I understood, I think, that a “Bean” is a Java-class with properties and getters/setters. As much as I understand, it is the equivalent of a C struct. Is that true? Also, is there a real syntactic difference between a JavaBean and a regular class? Is there any special definition or an Interface? Basically, why is … Read more
What are the differences between a Service, Provider and Factory in AngularJS? 30 30 From the AngularJS mailing list I got an amazing thread that explains service vs factory vs provider and their injection usage. Compiling the answers: Services Syntax: module.service( ‘serviceName’, function ); Result: When declaring serviceName as an injectable argument you will be … Read more
