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SOLID By Example

So I’ve recently been discussing SOLID principles with some engineers who are unfamiliar with them, and have realized that a good set of practical examples would be really useful for programmers who haven’t had professional experience with SOLID come to understand it. I won’t claim to be an expert at SOLID, so this is mostly an exercise for myself and a resource geared towards those who are less familiar with the SOLID principles and how to put them into practice when architecting applications in a modern object-oriented language.

To this end, I will take a very simple WPF application which uses a REST client to pull data from an online REST API. Then I will apply SOLID principles in a refactor to make its structure more testable, extensible, reusable, and maintainable. The example repository can be found on Github and is written in C#, but the basic principles apply to all object-oriented languages.

In the coming weeks I will create 5 more blog posts, each centering around one of the SOLID principles:

  • Single Responsibility Principle
  • Open Closed Principle
  • Liskov Substitution Principle
  • Interface Segregation Principle
  • Dependency Inversion Principle

I hope that newer developers will be able to learn from this, and that those of you who are already familiar with SOLID principles will find it to be a useful example!

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