# ASP.NET Core Fundamentals (.NET)

> Controllers, Actions, Routing, Middleware, Dependency Injection, Configuration

- 18 interview questions
- Junior
- [Interview Questions: .NET](https://sharpskill.dev/en/technologies/dotnet/interview-questions.md)

## 1. What is a Controller in ASP.NET Core?

**Answer**

A Controller is a class that handles incoming HTTP requests and returns responses. It contains action methods (Actions) that process specific requests and generate content (HTML, JSON, etc.). Controllers inherit from ControllerBase for APIs or from Controller for MVC applications with views.

## 2. What does an Action represent in an ASP.NET Core Controller?

**Answer**

An Action is a public method in a Controller that processes a specific HTTP request. It can return different types of results (IActionResult, ActionResult<T>, typed object). Actions are mapped to routes via conventional routing or route attributes.

## 3. What is the difference between ControllerBase and Controller in ASP.NET Core?

**Answer**

ControllerBase is the minimal base class for Web APIs that provides essential functionalities (ModelState, Request, Response). Controller inherits from ControllerBase and adds functionalities for views (ViewBag, ViewData, View()). Using ControllerBase for APIs improves performance by avoiding unnecessary view-related code.

## 15 more questions available

- How to define a route with attribute routing in ASP.NET Core?
- What does the route pattern "{controller=Home}/{action=Index}/{id?}" do?

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## Other .NET interview topics

- [C# Basics](https://sharpskill.dev/en/technologies/dotnet/interview-questions/csharp-basics.md): 25 questions, Junior
- [LINQ & Delegates](https://sharpskill.dev/en/technologies/dotnet/interview-questions/csharp-linq-delegates.md): 20 questions, Junior
- [C# Language Essentials](https://sharpskill.dev/en/technologies/dotnet/interview-questions/csharp-language-essentials.md): 15 questions, Junior
- [ASP.NET Core Request Lifecycle](https://sharpskill.dev/en/technologies/dotnet/interview-questions/aspnet-core-request-lifecycle.md): 20 questions, Junior
- [Configuration & Settings](https://sharpskill.dev/en/technologies/dotnet/interview-questions/configuration-settings.md): 20 questions, Junior
- [Application Lifecycle](https://sharpskill.dev/en/technologies/dotnet/interview-questions/application-lifecycle.md): 20 questions, Junior
- [Dependency Injection](https://sharpskill.dev/en/technologies/dotnet/interview-questions/dependency-injection.md): 24 questions, Mid-Level
- [Entity Framework Core](https://sharpskill.dev/en/technologies/dotnet/interview-questions/entity-framework-core.md): 25 questions, Mid-Level
- [Minimal APIs](https://sharpskill.dev/en/technologies/dotnet/interview-questions/minimal-apis.md): 18 questions, Mid-Level
- [Web API Development](https://sharpskill.dev/en/technologies/dotnet/interview-questions/web-api-development.md): 22 questions, Mid-Level
- [Async in ASP.NET Core](https://sharpskill.dev/en/technologies/dotnet/interview-questions/async-aspnet-core.md): 20 questions, Mid-Level
- [Authentication & Authorization](https://sharpskill.dev/en/technologies/dotnet/interview-questions/authentication-authorization.md): 18 questions, Mid-Level
- [HttpClient & Networking](https://sharpskill.dev/en/technologies/dotnet/interview-questions/httpclient-networking.md): 20 questions, Mid-Level
- [JSON Serialization](https://sharpskill.dev/en/technologies/dotnet/interview-questions/json-serialization.md): 20 questions, Mid-Level
- [Entity Framework Core Advanced](https://sharpskill.dev/en/technologies/dotnet/interview-questions/ef-core-advanced.md): 25 questions, Mid-Level
- [C# Advanced Features](https://sharpskill.dev/en/technologies/dotnet/interview-questions/csharp-advanced-features.md): 20 questions, Mid-Level
- [Clean Architecture](https://sharpskill.dev/en/technologies/dotnet/interview-questions/clean-architecture.md): 20 questions, Mid-Level
- [Logging, Monitoring & Observability](https://sharpskill.dev/en/technologies/dotnet/interview-questions/logging-monitoring.md): 22 questions, Mid-Level
- [Unit Testing & xUnit](https://sharpskill.dev/en/technologies/dotnet/interview-questions/unit-testing-xunit.md): 20 questions, Mid-Level
- [Integration Testing](https://sharpskill.dev/en/technologies/dotnet/interview-questions/integration-testing.md): 18 questions, Mid-Level
- [Docker & Containerization](https://sharpskill.dev/en/technologies/dotnet/interview-questions/docker-containerization.md): 16 questions, Mid-Level
- [NuGet Package Management](https://sharpskill.dev/en/technologies/dotnet/interview-questions/nuget-package-management.md): 16 questions, Mid-Level
- [Memory Management & GC](https://sharpskill.dev/en/technologies/dotnet/interview-questions/memory-management-gc.md): 22 questions, Senior
- [Reactive Programming](https://sharpskill.dev/en/technologies/dotnet/interview-questions/reactive-programming.md): 24 questions, Senior
- [Async/await & Patterns](https://sharpskill.dev/en/technologies/dotnet/interview-questions/async-await-patterns.md): 26 questions, Senior
- [.NET Design Patterns](https://sharpskill.dev/en/technologies/dotnet/interview-questions/dotnet-design-patterns.md): 24 questions, Senior
- [Performance Optimization](https://sharpskill.dev/en/technologies/dotnet/interview-questions/performance-optimization.md): 22 questions, Senior
- [Security & Best Practices](https://sharpskill.dev/en/technologies/dotnet/interview-questions/security-best-practices.md): 24 questions, Senior
- [SignalR & Real-time](https://sharpskill.dev/en/technologies/dotnet/interview-questions/signalr-realtime.md): 22 questions, Senior
- [Microservices Architecture](https://sharpskill.dev/en/technologies/dotnet/interview-questions/microservices-architecture.md): 25 questions, Senior

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