Mastering SOLID Principles of Object Oriented Design (C#)

Understand the theory behind Single Responsibility Principle (SRP) and see what are the common signs in our code that could indicate SRP violations.

In this lecture we will look at a small piece of code catering to one functionality and try to understand and identify how this class is violating SRP. We will then try to fix the SRP violation by refactoring the code and splitting it into multiple classes.

We will try to look at the changes we made and try to understand the benefits of SRP and how it leads to and is a first step in the direction of better design.

Understand the theory behind Open-Closed Principle (OCP).

Lets try to implement a simple user requirement and identify what are the common signs in our code that could indicate OCP violations. We will then try to fix the OCP violation by refactoring the code and introducing interfaced and splitting the single class into multiple classes.

We will try to understand the benefits of OCP and how it another step in the direction of better design.

Understand the theory behind Liskov Substitution Principle (LSP)

Let's implement a simple user requirement and identify the common signs in our code that could indicate Liskov Substitution Principle (LSP) violations. We will then refactor the code to resolve these violations by ensuring that our derived classes can be used interchangeably with their base classes without altering the correctness of the program. This will help us adhere to the LSP, promoting more robust and maintainable code.

We will explore the benefits of the Liskov Substitution Principle (LSP) and how it contributes to better software design. By adhering to LSP, we ensure that derived classes can replace their base classes without altering the program's behavior, leading to more reliable and flexible code.

In this video, you'll learn how ISP encourages creating smaller, more specific interfaces that are tailored to the needs of individual clients, rather than one large, general-purpose interface. This helps reduce the impact of changes and makes the system more maintainable and flexible.

In this video, you'll explore how to identify and fix violations of the Interface Segregation Principle (ISP) in your code. Through a practical example, you'll learn how large, bloated interfaces can lead to issues when clients are forced to implement methods they don't need. The video will demonstrate how to refactor such interfaces into smaller, more focused ones, ensuring each client only depends on methods that are relevant to them, leading to cleaner and more maintainable code.

In this video, you'll discover the benefits and importance of the Interface Segregation Principle (ISP) in software design. ISP promotes the creation of small, focused interfaces, allowing for more flexible and modular code. You'll learn how adhering to ISP leads to easier maintenance, reduced complexity, and a more robust architecture by ensuring that clients only interact with the methods they actually need. This principle plays a crucial role in building scalable and adaptable systems.

The Dependency Inversion Principle (DIP) promotes a design where high-level modules do not depend on low-level modules but instead rely on abstractions. It encourages decoupling dependencies to make code more flexible, maintainable, and easier to test.

Explores how to recognize violations of the Dependency Inversion Principle (DIP) in code and demonstrates how to fix them. It likely walks through a code example where high-level modules are directly dependent on low-level implementations, causing tight coupling and reducing flexibility. The video then shows how to refactor the code by introducing interfaces or abstractions, making the high-level modules depend on these abstractions instead of concrete implementations. This process helps improve maintainability, testability, and scalability of the system.

The video provides an in-depth explanation of key software architecture principles, focusing on Dependency Inversion Principle (DIP), Inversion of Control (IoC), IoC Containers, and Dependency Injection (DI).

Highlights the advantages of adopting DIP in software development.

In this final video of the SOLID Principles course, we recap the five key principles—Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion. I’ll summarize how these principles help create clean, maintainable, and scalable code. As a next step, I recommend diving into Design Patterns to further enhance your software design skills. Congrats on completing the course, and happy learning!