Top 10 ASP.NET Core Interview Questions and Answers for 2023

What is .NET Core?

1

.Net core is a free, open source and cross platform framework which is developed by Microsoft. It has design to build scalable, high performance applications for various platforms including Windows, Linux, and macOS.

What is the difference between .NET Core and .NET Framework?

2

While the.NET Framework is a Windows-only framework,.NET Core is modular and cross-platform. The performance of.NET Core is improved, and it is lightweight and optimised for cloud and microservices architecture. On the other hand, the.NET Framework supports older Windows applications and has a bigger ecosystem.

What are the benefits of using .NET Core?

3

Using.NET Core has some advantages, such as:  - Cross-platform compatibility - Scalability and high performance - an open-source design with a sizable user base. - Nature's modularity and lightness - capability to create applications using containers and the cloud.

What are the main components of .NET Core?

4

The main components of .NET Core include: - Common Language Runtime (CLR): It provides the execution environment for .NET Core applications. - Class Library: It provides a collection of reusable types and APIs. - CoreFX: It is the foundational class library for .NET Core. - CLI (Command-Line Interface): It allows building, running, and managing .NET Core applications from the command line.

Explain the concept of Dependency Injection in .NET Core.

5

Dependency Injection (DI) is a design pattern used in .NET Core to achieve loose coupling and improve code maintainability. It allows the creation of loosely coupled components, where dependencies are provided from external sources. DI reduces the direct dependencies between components by injecting the required dependencies through constructor parameters or properties.

What is ASP.NET Core?

6

ASP.NET Core is a web framework built on top of .NET Core. It provides a lightweight and modular approach for developing web applications. ASP.NET Core supports MVC (Model-View-Controller) pattern, Web API development, and SignalR for real-time web applications.

What is the difference between ASP.NET MVC and ASP.NET Core MVC?

7

ASP.NET MVC is built on top of the .NET Framework and is Windows-only, while ASP.NET Core MVC is built on top of .NET Core and is cross-platform. ASP.NET Core MVC is also more modular and lightweight compared to ASP.NET MVC. It provides improved performance and is optimized for cloud and microservices-based applications.

How do you handle configuration in .NET Core?

8

.NET Core provides the Configuration API to handle configuration settings. Configuration can be stored in various sources such as JSON files, XML files, environment variables, command-line arguments, and more. The Configuration API allows reading and accessing these settings easily in your application.

What is Middleware in ASP.NET Core?

9

Middleware in ASP.NET Core is software components that can be chained together to process HTTP requests and responses. Middleware sits between the web server and the application and performs various tasks such as authentication, logging, error handling, routing, and more. Each middleware component can process the request and pass it to the next middleware in the pipeline.

How do you deploy an ASP.NET Core application?

10

ASP.NET Core applications can be deployed in various ways, including: - Self-contained deployment: In this method, the application and its dependencies are published together as a standalone package that can be run on the target platform without requiring the .NET Core runtime. - Framework-dependent deployment: In this method, only the application-specific code is published, and the target platform should have the .NET Core runtime installed separately. - Docker containerization: ASP.NET Core applications can be containerized using Docker and deployed as Docker images to various platforms.