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Mastering ASP.NET Core: Top 20 Interview Questions and Expert Answers

ASP.NET Core has become a cornerstone in modern web development, and mastering it is essential for anyone pursuing a career in this field. To help you prepare for your ASP.NET Core interview, we’ve compiled a list of the top 20 questions that frequently appear in interviews, along with detailed answers to ensure you’re well-equipped to impress your potential employers.

1. What is ASP.NET Core?

ASP.NET Core is an open-source, cross-platform framework for building modern, cloud-based, and internet-connected applications. It’s a redesigned version of ASP.NET, providing a modular and high-performance framework for building web applications.

2. Differentiate between ASP.NET and ASP.NET Core.

ASP.NET Core is cross-platform and supports a modular architecture. It’s lightweight and optimized for cloud-based applications. It also enables side-by-side app versioning. ASP.NET, on the other hand, is Windows-centric and follows a monolithic architecture.

3. Explain Middleware in ASP.NET Core.

Middleware in ASP.NET Core is components that handle requests and responses. They are executed sequentially in the order they are added to the pipeline. Examples include authentication, routing, and exception handling.

4. What is Dependency Injection (DI) in ASP.NET Core?

Dependency Injection is a design pattern used to achieve Inversion of Control (IoC). In ASP.NET Core, DI is built into the framework and allows you to inject dependencies into classes, making components more modular and testable.

5. How does ASP.NET Core support cross-platform development?

ASP.NET Core is cross-platform by design. It supports Windows, macOS, and Linux, allowing developers to build and run applications on various operating systems.

6. Explain the term ‘Kestrel’ in ASP.NET Core.

Kestrel is a cross-platform web server built for ASP.NET Core. It is lightweight, fast, and designed to work seamlessly with the framework. While Kestrel can handle direct incoming requests, it’s often used in conjunction with a reverse proxy server like Nginx or Apache.

7. What is Razor Pages in ASP.NET Core?

Razor Pages is a new feature in ASP.NET Core that makes coding page-focused scenarios easier and more productive. It combines the best of Web Forms and MVC, providing a simple, clean, and efficient way to build web applications.

8. Explain the concept of Tag Helpers.

Tag Helpers in ASP.NET Core are used to generate HTML dynamically. They provide a way to run server-side code to generate HTML with a syntax similar to HTML. Examples include form tag helpers and link tag helpers.

9. Differentiate between TempData, ViewData, and ViewBag.

TempData, ViewData, and ViewBag are used to pass data from controllers to views. TempData persists for the duration of an HTTP request, ViewData persists during the current request, and ViewBag is a dynamic wrapper around ViewData.

10. What is Entity Framework Core?

Entity Framework Core (EF Core) is an object-relational mapping (ORM) framework for building modern, data-driven applications. It provides a set of APIs for interacting with databases, allowing developers to work with data using .NET objects.

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11. Explain the role of the Startup class in ASP.NET Core.

The Startup class in ASP.NET Core is the entry point for configuring services and the application’s request-handling pipeline. It contains the ConfigureServices method for configuring services and the Configure method for setting up the HTTP request pipeline.

12. How does ASP.NET Core support asynchronous programming?

ASP.NET Core has extensive support for asynchronous programming, allowing developers to write non-blocking code. It uses async/await keywords and asynchronous versions of various APIs to improve application responsiveness.

13. What is the role of the ConfigureServices method in the Startup class?

The ConfigureServices method in the Startup class is used to configure services that the application will use. This includes setting up dependency injection, adding middleware components, and configuring various services required by the application.

14. Explain the term ‘JWT’ and its usage in ASP.NET Core.

JWT stands for JSON Web Token. It is a compact, URL-safe means of representing claims to be transferred between two parties. In ASP.NET Core, JWTs are commonly used for authentication and authorization by generating and validating tokens.

15. What is the purpose of the appsettings.json file in ASP.NET Core?

The appsettings.json file in ASP.NET Core is used for storing configuration settings. It allows developers to separate configuration from code, making it easier to manage and update settings for different environments.

16. Differentiate between Authentication and Authorization in ASP.NET Core.

Authentication is the process of determining a user’s identity, while authorization is the process of determining what actions a user is allowed to perform. ASP.NET Core provides mechanisms for both authentication and authorization.

17. Explain the concept of Dependency Injection in ASP.NET Core.

Dependency Injection is a pattern used to create loosely coupled components in an application. In ASP.NET Core, services are injected into components, making the application more modular, testable, and maintainable.

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18. How does ASP.NET Core handle configuration settings?

ASP.NET Core uses the IConfiguration interface to access configuration settings. Configuration settings can be stored in various sources, including appsettings.json files, environment variables, and command-line arguments.

19. What is the purpose of the ConfigureServices method in the Startup class?

The ConfigureServices method in the Startup class is used to configure services that the application will use. This includes setting up dependency injection, adding middleware components, and configuring various services required by the application.

20. Explain the concept of Middleware in ASP.NET Core.

Middleware in ASP.NET Core is components that handle requests and responses. They are executed sequentially in the order they are added to the pipeline. Examples include authentication, routing, and exception handling.

External Links

  1. Official ASP.NET Core Documentation
    • The official documentation by Microsoft is a comprehensive resource for learning and mastering ASP.NET Core.
  2. ASP.NET Core GitHub Repository
    • Explore the source code, issues, and discussions related to ASP.NET Core on its GitHub repository.

Conclusion:

Mastering ASP.NET Core is a valuable skill for web developers, and being well-prepared for interviews is essential. By understanding these top 20 interview questions and their answers, you’ll be well-equipped to showcase your expertise in ASP.NET Core and land that dream job in web development. Good luck!

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