Learn ASP NET Core using Step-by-Step Tutorials

There can be multiple database contexts in a large project so it is always a good idea to create a separate folder for all context classes. Currently, this folder will only contain ApplicationDbContext.cs file. This folder contains interfaces such as IUnitOfWork, IGenericRepository, and other domain-specific interfaces such as IPlayerRepository, etc. The Application layer contains the business logic and defines abstractions in the form of interfaces. The application layer depends on the Domain layer and acts as a bridge between the Domain layer and external layers such as Persistence or Presentations layer. This layer contains business services, DTOs, Commands, Queries, etc.

Our test project is interested in testing the behavior of CartController. There are quite a few test templates supported in .NET Core like nunit, xunit and mstest. Note how we will not create any concrete implementations of our services at this point. We are asp net razor tutorial more interested in establishing and testing the behavior of our code. That means that concrete service implementations can come later. You are free to throw unhandled exceptions or terminate your application – background jobs will be re-tried automatically.

ASP.NET Core Data Context

In my previous post, A Guide for Building Software with Clean Architecture, I explained how clean architecture allows developers to build testable, maintainable, and flexible software systems. We learned the benefits, principles, and challenges of using clean architecture. We learned how clean architecture focuses on dividing the software into independent and loosely coupled layers in a way that code modifications done in one layer don’t affect the code in other layers. In this post, I will show you how to implement the clean architecture in an ASP.NET Core Web API project. You will learn how to organize the application code into separate layers or modules with a specific responsibility. If you are working on a particular feature, then it is difficult to find related controllers, models, etc.

  • For example the Users Controller accesses app settings via an IOptions appSettings object that is injected into the constructor.
  • Finally, you should see each web application with some indication that you are currently logged in.
  • In this article, you will learn how to install the latest version of Python 3 on Windows, macOS, Linux, iOS, and Android.
  • After the Homebrew brew install command finishes, Python 3 should be installed on your system.
  • Unhandled exceptions are generated by the .NET framework and caused by bugs in the application code.
  • Each of the above feature folders can contain Commands, Queries, Handlers, Events, DTOs, Validators, and other components specific to that particular feature.

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CVE-2020-0603: ASP.NET Core Remote Code Execution Vulnerability

The startup class configures the request pipeline of the application and how all requests are handled. ASP.NET Core merges ASP.NET MVC, ASP.NET Web API, and ASP.NET Web Pages into
one application framework. ASP.NET API is an API application model (Application Programming Interface). When a browser requests an ASP or ASP.NET file, the ASP engine reads the file, executes
any code in the file, and returns the result to the browser. Controller methods, such as the Index method above, generally return an IActionResult (or a class derived from ActionResult), not a type like string. This tutorial is designed for software programmers who would like to learn the basics of ASP.NET Core from scratch.

Affordable solution to train a team and make them project ready. Currently, .NET 6 and .NET 7 are Active, and Microsoft Ended the Support for the rest of the older versions. Out of .NET 6 and .NET 7, Long Term Support (LTS) is provided to .NET 6, and Short Term Support (STD) is provided to .NET 7.


It’s about testing only one thing, in isolation, by mocking how your dependencies should behave. Job storage access is fully abstracted and you can implement the support for your favorite storage. The .NET agent v9.2.0 or higher automatically instruments the Microsoft.Azure.Cosmos library.

Within each route the controller calls the user service to perform the action required, this enables the controller to stay ‘lean’ and completely separated from the database / persistence code. I hope the article helps you understand the usages and variety of methods of connection string used. Here you will learn how to create the context and entity classes for an existing database in Entity Framework Core.

The Web API offers a simple communication way based on Representational State Transfer (REST). With REST, HTTP verbs such as GET, POST, PUT, and DELETE is used. GET is used to retrieve resources, POST is used to add new resources, PUT is used to update resources, and DELETE is used to delete resources.

It only has one property DateOccurred that tells us when a particular event has occurred. This interface declares a method that can be used to dispatch domain events throughout the application. This file defines a child interface of IEntity interfaces defined above.

WPF Demos

It is clearly not a good approach to combine your models and validation logic. Microsoft is aware of a remote code execution vulnerability exists in ASP.NET Core software when the software fails to handle objects in memory. An attacker who successfully exploited this vulnerability could cause a denial of service against an ASP.NET Core web application. The vulnerability can be exploited remotely, without authentication. All business services defined in the application layer are registered with the dependency injection container.

The domain layer is the core component of clean architecture and it represents the domain and use-case-independent business logic of the system. This layer has no dependency on any technology, third-party library, or frameworks. For our demo project, let’s create the following two folders Common and Entities in the project.