Design Patterns: Single Responsibility Principle Explained Practically in C# (The S in SOLID)

Step-by-Step Tutorial: Implementing the Single Responsibility Principle in C#

1. Understand the Single Responsibility Principle (SRP):

   • SRP states that a class should have only one reason to change, meaning it should have a single responsibility.
   • Identify areas in your code where multiple responsibilities are handled by a single class.

2. Analyze the Existing Code:

   • Review your codebase to identify classes that violate the SRP.
   • Look for classes that handle multiple tasks such as user interaction, data validation, and data generation in the same class.

3. Refactor Standard Messages Handling:

   • Create a new class named StandardMessages to handle standard messages for the application.
   • Implement methods like WelcomeMessage() and EndApplication() within this class to manage standard messages effectively.

4. Separate User Data Capture Logic:

   • Extract the logic related to capturing user data into a separate class, e.g., PersonDataCapture.
   • Create a method like CapturePersonInformation() within this class to handle user data input.

5. Implement Data Validation in a Separate Class:

   • Create a new class named PersonValidator to handle data validation tasks.
   • Define methods like ValidateFirstName() and ValidateLastName() within this class to validate user input.

6. Refactor User Account Generation:

   • Move the logic for creating user accounts into a separate class, e.g., AccountGenerator.
   • Implement a method like CreateAccount() within this class to generate user accounts.

7. Reorganize the Main Control Flow:

   • Refactor the Main method to control the flow of different parts of the application.
   • Ensure that the Main method delegates tasks to the appropriate classes like PersonDataCapture, PersonValidator, and AccountGenerator.

8. Maintain a Balanced Approach:

   • Aim for a balance between creating new classes for single responsibilities and avoiding excessive class creation.
   • Consider creating a folder structure to organize related classes within your project.

9. Test and Iterate:

   • Test your refactored code to ensure it functions correctly.
   • Iterate on the design based on feedback and further understanding of the SRP.

10. Stay Informed:

    • Continuously educate yourself on design principles like SRP and other SOLID principles.
    • Stay tuned for the next video in the series to learn about the Open-Closed Principle.

By following these steps, you can effectively apply the Single Responsibility Principle in your C# codebase, leading to more maintainable and scalable software.