The generic GetService< T> method is an extension method. This means you need to have a : using Microsoft.Extensions.DependencyInjection; to allow the compiler to find it. This method is only meant for optional services. It will return null if the object can’t be constructed, either because the type wasn’t registered or because some of its … Read more
(Note: This answer is language-agnostic, although the question specifically mentions PHP, but being unfamiliar with PHP, I have not provided any PHP examples). Terminology – Dependencies and Coupling In the context of Object-Oriented Programming, a dependency is any other object type which a class has a direct relationship with. When a class depends directly upon … Read more
What Is It? The books Agile Software Development, Principles, Patterns, and Practices and Agile Principles, Patterns, and Practices in C# are the best resources for fully understanding the original goals and motivations behind the Dependency Inversion Principle. The article “The Dependency Inversion Principle” is also a good resource, but due to the fact that it … Read more