ASP.Net Core Web API - Onion Architecture | Best Practices Architecture

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In this video , we are going to cover the Onion architecture in ASP.Net 5.0.

What is Onion Architecture?
======================
A large portion of the customary design raises basic issues of tight coupling and partition of concerns. Onion Architecture was acquainted by Jeffrey Palermo with giving a superior method to construct applications in the context of better testability, practicality, and constancy. Onion Architecture tends to the difficulties confronted with 3-tier and n-tier architectures, and gives an answer for normal issues. Onion design layers associate with one another by utilizing the Interfaces.

Layers of Onion Architecture
======================
Basically, it uses the concept of Layers but they are different from 3-tier and N-tier Layers. Let's deep dive into each of these layers.

Domain Layer:
It exists at the center part of the Onion architecture where it consists of all application domain entities which are nothing but database models created by code first approach. In this video, I have used Fluent API in creating the table schema using Entity Framework

Repository Layer :
The repository layer acts as a middle layer between the services and Model objects and in this layer, we will maintain all the Database migrations and application Data context object and in this layer, we typically add interfaces that will consist of data access pattern of read and write operations involving a database.

Services Layer:
This layer is used to communicate between the Repository layer and Main Project where it consists of exposable API's. The Service layer also could hold business logic for an entity. In this layer, the service interfaces are kept separate from their implementation for loose coupling and also the separation of concerns.

UI Layer:
The UI is nothing but a front end application that will communicate with this API.

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