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Dependency injection is a pattern used to create instances of objects that other objects rely upon without knowing at compile time which class will be used to provide that functionality or simply the way of injecting properties to an object is called dependency injection. Example for Dependency injection.
Dependency Inversion Principle (DIP) Dependency Injection (DI) 1- IOC: abstract principle describing an aspect of some software architecture designs in which the flow of control of a system is inverted in comparison to procedural programming. 2- DIP: is Object Oriented Programming (OOP) principle (D of SOLID).
This is some pseudocode (roughly based on Unity): You create a logging interface: void Log(string text); then use this interface in your classes. [Dependency] public ILog Log {get;set;} inject those dependencies at runtime. public SomeClass Create() var result = new SomeClass();
Dependency Injection is an Inversion of Control technique for supplying objects ('dependencies') to a class by way of the Dependency Injection Design Pattern. Typically passing dependencies via one of the following: 'High-level modules should not depend on low-level modules. Both should depend on abstractions.'.
What the Dependency Injection is all about it to help you to, well, "inject" these dependencies in your code. Most of the frameworks allow you to do this by specifying in an external file, what object is to be injected. Assume a properties file for a fictitious dependency injector: #mock employee.
xunit.di is an extension of xUnit testing framework, built to support xUnit dependency injection, which allows us to achieve Inversion of Control (IoC) between test classes and their dependencies. To use xunit.di: Configure dependencies in the Setup.cs class. Find instructions from xunit.di GET-STARTED.
As @Nkosi said, your library should not concern itself with dependency injection, just the inversion of control, i.e. externalizing its dependencies, so that they can be injected. The job of configuring the DI container is for the application utilizing the library (ies). If there's a lot of services to be configured, you can abstract this via ...
Dependency injection in simplified terms is adding a parameter to an capsulating chunk block of code (e.g. class, function, block, etc.), as opposed to using the literal procedural code that would be used without the parameter. Composition is when you use a dependency injected parameter/argument upon instantiating the object being composed
Use that to resolve the dependencies: _serviceCollection.AddSingleton<IService> (x => new Service (x.GetRequiredService<IOtherService> (), x.GetRequiredService<IAnotherOne> (), "")); The factory delegate is a delayed invocation. Whenever the type is to be resolved, it will pass the completed provider as the delegate parameter.
The IServiceCollection interface is used for building a dependency injection container. After it's fully built, it gets composed to an IServiceProvider instance which you can use to resolve services. You can inject an IServiceProvider into any class.