Exploring the Backbone of .NET Core: 5 Essential Design Patterns

?? Hello Network,

I hope this post finds you all well. Today, I wanted to share some insights into the most common patterns in .NET Core that I've come across, and hope to shed some light on these concepts using Mermaid Diagrams.?? ♀?

#1 - Repository Pattern

The repository pattern is widely used to create an abstraction layer between the data access layer and the business logic layer of an application.

In the above diagram, the `Controller` uses a `Service` which in turn uses a `Repository`. The `Repository` then interacts with the `DBContext`, which finally communicates with the `Database`.

#2 - Factory Pattern

The factory pattern is a creational design pattern providing an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created.

Here, a `Factory` creates a `Product`. `ConcreteFactory` is a specific implementation of the `Factory` and it creates a `ConcreteProduct`, which is a specific implementation of the `Product`. The `Client` uses the `Factory` to create objects.

#3 - Dependency Injection Pattern

Dependency Injection is a technique where an object receives other objects that it depends on. It allows decoupling objects and their dependencies.

In the above diagram, `Startup` configures the `IServiceProvider`. The `Controller` uses the `IServiceProvider` to get the `Service` it depends on.

#4 - Adapter Pattern

The Adapter Pattern is a structural design pattern that allows objects with incompatible interfaces to work together. This is done by creating a separate adapter class that converts the (incompatible) interface of a class (adaptee) into another interface that clients require.

In the diagram, `Client` uses the `Adapter` to communicate with the `Adaptee`. The `Adapter` translates the requests from the `Client` into a form that the `Adaptee` can understand.

#5 - Decorator Pattern

The Decorator Pattern is a structural pattern that allows behavior to be added to an individual object, either statically or dynamically, without affecting the behavior of other objects from the same class.

In the diagram, `Component` is the base interface, and `ConcreteComponent` is a class that implements the `Component`. `Decorator` is an abstract class that also implements the `Component` but it has a HAS-A relationship with `Component`. `ConcreteDecorator` is a concrete class that extends the `Decorator`.

I hope these diagrams provide some value to your understanding of these design patterns in .NET Core. Always remember, the right pattern depends on the problem at hand, there's no one-size-fits-all!

If you have any other patterns you'd like me to explore or have any questions, feel free to drop a comment!?

Stay coding! ????

Keep learning, keep growing! ????