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SOLID Principles in C# with Real Time Examples | Design Principles

The SOLID Principles are the design principles that enable us to manage several software design problems. These principles provide us with ways to move from tightly coupled code to loosely coupled and encapsulated real business needs properly. Also, readable, adaptable, and scalable code.

The SOLID Principles guide developers as they write readable, adaptable, and scalable code or design an application.

The SOLID Principles can be applied to any OOP program.

The SOLID Principles were developed by computer science instructor and author Robert C. Martin. 

The 5 principles of SOLID are:

1.      Single Responsibility Principle (SRP)

2.      Open-Closed Principle (OCP)

3.      Liskov Substitution Principle (LSP)

4.      Interface Segregation Principle (ISP)

5.      Dependency Inversion Principle (DIP)

Now, the SOLID Principles have also been adopted in both agile development and adaptive software development.

Single Responsibility Principle (SRP):

  • Idea: A class should have one reason to change.
  • In Short: Do one thing and do it well.

Open/Closed Principle (OCP):

  • Idea: Software entities should be open for extension but closed for modification.
  • In Short: Extend without changing existing code.

Liskov Substitution Principle (LSP):

  • Idea: Subtypes must be substitutable for their base types.
  • In Short: Inheritance should make sense.

Interface Segregation Principle (ISP):

  • Idea: A class should not be forced to implement interfaces it does not use.
  • In Short: Be specific in your interfaces.

Dependency Inversion Principle (DIP):

  • Idea: Depend on abstractions, not on concretions.
  • In Short: High-level and low-level modules should depend on abstractions.

Remember, SOLID principles aim to make your code more maintainable, flexible, and scalable. They're like guiding principles to write clean and robust code.


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