Are you preparing for a job change / Interview? Here are some sets of questions and Answers for you to crack your goal.
Let's start and best of luck in advance.
1. What is ASP.NET Core, and how does it differ from previous versions of ASP.NET?
Ans:- ASP.NET Core is a modern, open-source framework used to build cross-platform web applications.
- It differs from previous versions of ASP.NET by being lightweight, modular, and designed for improved performance.
- It also introduces a unified programming model for building web APIs and MVC applications.
2. Explain the concept of middleware in ASP.NET Core?
Ans:- Middleware in ASP.NET Core refers to components that handle HTTP requests and generate responses. Each middleware component performs specific tasks like authentication, logging, routing, or exception handling. Middleware is configured in the application pipeline and is executed sequentially based on the request and response flow.
Ex:- Inside Startup.cs class file Configure() method we can see middlewares
- app.UseHttpsRedirection();
- app.UseStaticFiles();
- app.UseRouting();
- app.UseAuthentication();
- app.UseAuthorization();
- app.UseSession();
3. What is Dependency Injection, and how is it implemented in ASP.NET Core?
Ans:- Dependency injection is a design pattern.
It allows objects to receive their dependencies from an external source rather than creating them internally.
In ASP.NET Core, dependency injection is implemented through Microsoft.Extensions.DependencyInjection framework.
It allows you to register dependencies in the startup class and inject them into controllers, services, or other components.
We have three ways to do Dependency Injection
- Constructor Injection
- Method Injection
- Property Injection
4. How does routing work in ASP.NET Core?
Ans:- Routing in ASP.NET Core determines which controller and action method should handle an incoming HTTP request based on the URL pattern and HTTP verb.
It can be configured using attributes or convention-based approaches, providing flexibility in defining custom routes, route constraints, and route parameters.
We can set our custom routes in Route.config.
The default route in ASP .Net Core is {controller=Home}/{action=Index}/{id?}
5. Can you describe the request pipeline in ASP.NET Core?
Ans:- The request pipeline in ASP.NET Core consists of a series of middleware components that process an incoming HTTP request and generate a response.
Each middleware component performs specific tasks, such as authentication, authorization, request processing, and response generation. The pipeline is configured in the Startup class using the Configure(...) method.
6. What is the purpose of tag helpers in ASP.NET Core?
Ans:- Tag helpers in ASP.NET Core extend HTML tags with additional functionality or logic.
They allow server-side code to participate in rendering and processing HTML elements, making it easier to work with server-side code in Razor views. Tag helpers simplify the development of dynamic views, form validation, or data binding scenarios.
Ex:-
<form asp-action="Create">
<input asp-for="FirstName" class="form-control" />
<a asp-action="Edit" asp-route-id="@Model.Id">Edit</a>
here asp-action, asp-for, and asp-route-id are tag helpers.
7. How do you handle authentication and authorization in ASP.NET Core?
Ans:- ASP.NET Core provides a flexible and extensible authentication and authorization system.
It supports so many authentication schemes such as cookies, JWT tokens, OAuth, and OpenID Connect.
Authorization can be based on roles, policies, or custom requirements.
Using attributes or middleware, you can configure authentication and authorization in the Startup class and apply them to controllers or actions.
8. Differenciate Razor Page and MVC in ASP.NET Core?
Ans:- Razor Pages and MVC are two approaches for building web applications in ASP.NET Core. MVC follows the Model-View-Controller pattern.
Ex:-
Razor Pages adopt the simpler approach, allowing developers to put the UI and logic for a specific page in a single file.
Ex of Razor Page:- This is the example of a razor page, where we can write HTML codes and cs logics in one page i.e. ".cshtml"
{
@if (Model.TeamLeaves != null)
{
@foreach (var item in Model.TeamLeaves)
{
<tr>
<td>
@item.AppliedBy
</td>
<td>
@item.DateRequested.Value.ToString("dd/MM/yyyy")
</td>
<td>
@item.Reason
</td>
<td>
@Html.ActionLink("Details", "Details", new { id = item.Id })
</td>
<td>
</td>
</tr>
}
}
}
9. Can you explain the concept of model binding in ASP.NET Core?
Ans:- Model binding in ASP.NET Core maps incoming request data to parameters or properties of an action method's input model. It simplifies handling user input and binding it to strongly typed models. ASP.NET Core's model binding infrastructure automatically maps form data, query strings, route data, and request headers to the corresponding action method parameters.
10. How to implement caching in ASP.NET Core?
Ans:- ASP.NET Core provides built-in support for caching data. It offers in-memory caching, distributed caching with providers like Redis or SQL Server, and response caching to cache the output of specific actions or pages. Caching improves performance by storing frequently accessed data and reducing the load on the server.
11. What are the advantages of using Entity Framework Core in ASP.NET Core?
Ans:- Entity Framework Core simplifies database access and data manipulation in ASP.NET Core applications. It offers a higher-level abstraction over database operations, supports multiple database providers, and provides features like migrations, LINQ query generation, and automatic change tracking. Entity Framework Core promotes productivity, maintainability, and testability in data access code.
12. How do you handle errors and exceptions in ASP.NET Core?
Ans:- ASP.NET Core provides a centralized error-handling mechanism through middleware. You can configure custom error-handling middleware to catch exceptions and generate appropriate responses. Additionally, ASP.NET Core offers logging facilities for capturing and tracking application errors. Proper exception handling and logging contribute to the robustness and maintainability of an application.
13. Can you describe the different deployment options for an ASP.NET Core application?
Ans:- ASP.NET Core applications can be deployed as self-contained executables, including the runtime, or as framework-dependent executables that rely on a shared runtime. Deployment options include traditional web servers, containerized environments like Docker, and cloud platforms such as Azure or AWS.
14. How do you implement logging in ASP.NET Core?
Ans:- Logging in ASP.NET Core is achieved using the built-in logging framework based on Microsoft.Extensions.Logging namespace. It supports various logging providers like console, debug, file, or external logging frameworks such as Serilog. Logging can be configured in the Startup class to capture application logs, handle exceptions, and track important events for troubleshooting and monitoring purposes.
15. What are the best practices for securing an ASP.NET Core application?
Ans:- Securing an ASP.NET Core application involves practices like using strong authentication mechanisms, implementing authorization based on the principle of least privilege, protecting sensitive data through encryption and secure storage, following secure coding practices, regularly updating dependencies and frameworks, and performing threat modeling and security testing to identify and mitigate potential risks.
Thank You :)
