C# notes about SOLID

Single Responsibility Principle

A module should have only one responsibility, do only one thing. For ex. convert text to html, but not convert text to html and upload it to the storage.

.. the final version of the SRP is: A module should be responsible to one, and only one, actor. [Robert C. Martin]

• A module is a unit of code that performs a specific task. It can be a class, function, or procedure.
• An actor is a person, system, or process that interacts with the module.

Open-Closed Principle

Software entities (classes, modules, functions, etc.) should be open for extension but closed for modification.

After introducing a new feature if code in present class, function, etc is changing somehow this principle is violated. Create plugin system.

Liskov Substitution Principle.

The new modifier should not be used to override virtual methods in inherited classes.

Interface Segregation Principle.

If two classes need to use different methods from one interface, the interface should be split into two.

Dependency Inversion Principle.

Pass interfaces as parameters instead of classes.