SOLID Principles in .NET Core

 The SOLID principles are fundamental object-oriented design principles that help create more maintainable, flexible, and scalable software. Let me explain how each principle applies in .NET Core:

Single Responsibility Principle (SRP)

A class should have only one reason to change, meaning it should have only one job or responsibility.

In .NET Core, you might implement this by:

• Separating your controllers from your business logic
• Using dedicated service classes for specific operations
• Creating focused repository classes for data access

Open/Closed Principle (OCP)

Software entities should be open for extension but closed for modification.

.NET Core supports this through:

• Interfaces and dependency injection
• Abstract base classes
• Extension methods
• Middleware pipeline architecture

Liskov Substitution Principle (LSP)

Objects of a superclass should be replaceable with objects of subclasses without affecting program correctness.

In .NET Core:

• Properly implement interface contracts
• Use inheritance carefully
• Leverage polymorphism through DI container

Interface Segregation Principle (ISP)

Clients should not be forced to depend on interfaces they don't use.

Implement in .NET Core by:

• Creating focused, granular interfaces
• Using composition of interfaces rather than large, monolithic ones
• Leveraging .NET Core's built-in DI container for registration

Dependency Inversion Principle (DIP)

High-level modules should not depend on low-level modules; both should depend on abstractions.

.NET Core has excellent support through:

• Built-in dependency injection container
• Interface-based programming
• Factory patterns