Razor Pages Interview Questions & Answers

1. What are Razor Pages in ASP.NET Core?

• Answer: Razor Pages is a feature in ASP.NET Core that makes it easy to build web applications with a page-centric architecture. It combines the benefits of MVC (Model-View-Controller) and Web Forms, providing a simpler way to create web pages.

2. How does Razor Pages differ from MVC in ASP.NET Core?

• Answer: Razor Pages is a page-focused framework, while MVC is a controller-focused framework. In Razor Pages, each page has its own model, view, and code-behind file, making it more straightforward for small to medium-sized applications.

3. Explain the Razor Pages file structure.

• Answer: Razor Pages typically consist of three files: a .cshtml file for the HTML markup and view logic, a .cshtml.cs file for the page's code-behind (C#), and a .cshtml.designer.cs file for IntelliSense support.

4. What is the purpose of the @page directive in Razor Pages?

• Answer: The @page directive is used to specify the URL or route for a Razor Page. It defines the URL that should map to the page, making it accessible to users.

5. How can you pass data from a Razor Page to its model?

• Answer: Data can be passed from a Razor Page to its model using the @page directive with additional parameters. These parameters can then be captured by the corresponding handler method in the code-behind file.

6. Explain the role of the @model directive in Razor Pages.

• Answer: The @model directive is used to declare the model type for a Razor Page. It specifies the type of data that the page expects and is used for type-checking in the view.

7. What is dependency injection, and how is it used in Razor Pages?

• Answer: Dependency injection is a design pattern where dependencies are injected into a class rather than being created inside the class. In Razor Pages, services and dependencies can be injected into the page's constructor or handler methods.

8. How can you handle form submissions in Razor Pages?

• Answer: Form submissions in Razor Pages are handled by creating a POST handler method in the code-behind file. This method is decorated with the [ValidateAntiForgeryToken] attribute, and it processes the form data.

9. Explain the purpose of the @section directive in Razor Pages.

• Answer: The @section directive is used to define content sections within a Razor Page. It allows you to organize and structure the layout of a page by specifying different sections for styles, scripts, and other content.

10. What is the role of the @Html helper in Razor Pages?

• Answer: The @Html helper in Razor Pages provides a set of methods for rendering HTML elements and generating URLs. It simplifies common HTML tasks, such as rendering form elements, creating links, and displaying validation messages.

11. How can you implement authentication and authorization in Razor Pages?

• Answer: Authentication and authorization in Razor Pages can be implemented using ASP.NET Core Identity or other authentication mechanisms. You can use the [Authorize] attribute to restrict access to specific pages or handlers.

12. Explain the concept of Tag Helpers in Razor Pages.

• Answer: Tag Helpers are a feature in Razor Pages that enable server-side code to participate in the rendering and processing of HTML elements. They provide a more readable and HTML-like syntax for generating dynamic content.

13. What is the purpose of the @* *@ syntax in Razor Pages?

• Answer: The @* *@ syntax is used for multi-line comments in Razor Pages. It allows developers to comment out a block of code within the view without affecting the rendered output.

14. How can you use ViewData and TempData in Razor Pages?

• Answer: ViewData and TempData are used to pass data between a controller or page and its corresponding view. ViewData is used for the current request, while TempData persists data for the next request.

15. What is the role of the RedirectToPage method in Razor Pages?

• Answer: The RedirectToPage method is used to redirect users to another Razor Page. It takes the page name as a parameter and can also pass route values, query parameters, or TempData.

16. How can you use AJAX with Razor Pages?

• Answer: AJAX can be used in Razor Pages by making asynchronous requests to server-side handler methods. This is typically achieved using JavaScript frameworks like jQuery or directly using the Fetch API.

17. Explain the purpose of the OnGet and OnPost methods in Razor Pages.

• Answer: The OnGet and OnPost methods in Razor Pages are handler methods that correspond to HTTP GET and POST requests, respectively. They are used to process requests and perform actions based on user interactions.

18. What is the @functions directive in Razor Pages used for?

• Answer: The @functions directive is used to declare C# functions within a Razor Page. It allows developers to define

reusable code blocks that can be used in the page's code-behind.

19. How can you implement validation in Razor Pages?

• Answer: Validation in Razor Pages can be implemented using the ModelState dictionary and data annotations on the model properties. The @Html.ValidationMessageFor helper can be used to display validation error messages.

20. How does Razor Pages handle routing and URL parameters?

• Answer: Razor Pages use attribute routing, and the route for a page is defined using the @page directive. URL parameters are typically captured as parameters in the handler methods, and the routing system binds them to corresponding method parameters.