Open Closed Principle: Real-Life Example with Refactoring. Open for Extension Closed for Modification. I cover test-ability, multiple inheritance and polymorphism. Example Below example violates the rules of SRP & OCP. by Tagged csharp, ocp in c#, open closed principle, open closed principle in csharp The Open/Closed Principle, which I explained in a previous article, is one of the key concepts in OOP that enables you to write robust, maintainable and reusable software components.But following the rules of that principle alone is not enough to ensure that you can change one part of your system without breaking other parts. Notice that the single responsibility principle is also applied. Prefer extension over modification (C# Code example).Bad Way. The Open Closed Principle represents the “O” of the five SOLID software engineering principles to write well-designed code that is more readable, maintainable, and easier to upgrade and modify. SOLID Principles by Examples: Open/Closed This post analyzes and provides a real-world example of the Open/Closed principle, one of the five SOLID principles for programming. A regular discussion I have with junior developers is about loosely coupled code. It is relatively easy to describe certain topics that way: a dog barks, a cat meows, but they all make a sound. A module will be said to be open if it is still available for extension. Why especially with .Net, it is important and the benefits it can bring. Suppose we are going to design a class for Shopping cart, Generally we need 3 basic functionalities for that. When I was studying IT, the examples in the object-oriented programming course usually had something to do with the animal kingdom. Here's a breakdown of the SOLID principles in a real-world setting. Bertrand Meyer coined the term Open Closed Principle, which first appeared in his book Object-Oriented Software Construction , release in 1988. O — Open/Closed Principle. That’s why I searched for some examples of these issues in Open Source projects and use them in this series. Class should be open for extension not for modification. The Open/Closed Principle Real World Example 20 March 2018. ... o is for open/closed principle ... behaviors. The Open/Closed Principle. should be open for extension but closed for modification. Photo: Unsplash. This violates the Open Closed Principle, because at the moment there are 2 types of customer, if we want to add another customer type we have to add an if else statement below and will modify the existing code. This principle suggests that “classes should be open for extension but closed for modification”. The Open/Closed Principle, created by Bertrand Meyer in 1988, states: Software entities (classes, modules, functions, etc.) Now you know that Open-Closed means that your code is open to be extended by new functionalities and closed in terms of changing the source code, but appending to it. 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