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ASP.NET Core: About

ASP.NET Core is built on top of .NET but also runs on top of .NET Framework.

.NET Core includes console applications only, which is useful for various tools and local services. Additional application models have been built on top of .NET Core to extend its functionality, such as:

So, ASP.NET Core is built on .NET Core, but it also runs on the .NET Framework. See diagram.

ASP.NET 4.6 ASP.NET Core 1.0
.NET Framework 4.6 .NET Core 1.0
.NET Framework libraries .NET Core libraries
compilers and runtime components
.NET Platform (C#, VB.NET, F#, Roslyn, RyuJIT, SIMD)

Like .NET Core, ASP.NET Core can run on the platforms MacOS, Linux and Windows. It was designed to be leaner and more responsive than ASP.NET even on platforms other than Windows.

ASP.NET Core is a cross-platform, high-performance framework for building modern, cloud-based, and internet-connected applications. It is a redesign of the traditional ASP.NET framework, making it more modular, scalable, and lightweight. Here are the key features and concepts of ASP.NET Core:

Key Features

  1. Cross-Platform: ASP.NET Core runs on Windows, macOS, and Linux, making it versatile for various development environments and deployment targets.

  2. High Performance: Designed for speed and efficiency, ASP.NET Core can handle high-throughput and low-latency applications. It's one of the fastest web frameworks available.

  3. Modular Architecture: ASP.NET Core uses a modular framework design, allowing developers to include only the necessary components, resulting in a lighter and more manageable application.

  4. Unified MVC and Web API: Combines the MVC (Model-View-Controller) and Web API frameworks into a single, unified framework, simplifying development and code sharing.

  5. Dependency Injection: Built-in support for dependency injection improves code maintainability and testability by promoting loose coupling between components.

  6. Razor Pages: A page-based coding model that makes it easy to create server-side rendered pages with a simple and clean syntax.

  7. Tag Helpers: HTML tag helpers allow server-side code to participate in creating and rendering HTML elements in Razor views.

  8. Configuration and Environment Management: Flexible configuration system that can read settings from various sources (e.g., JSON files, environment variables, command-line arguments).

  9. Middleware Pipeline: Uses a middleware pipeline for handling requests and responses, enabling more granular control over HTTP processing.

  10. Cross-Site Request Forgery (CSRF) Protection: Built-in mechanisms to protect against CSRF attacks.

  11. SignalR: Provides real-time web functionality, enabling server-side code to push content to clients instantly.

Development Workflow

  1. Create a Project: Use Visual Studio, Visual Studio Code, or the .NET CLI to create a new ASP.NET Core project.
  2. Define Models: Create model classes that represent the data and business logic.
  3. Create Controllers: Implement controllers to handle HTTP requests and responses.
  4. Design Views: Use Razor syntax to create views for rendering HTML to the client.
  5. Configure Services: Register and configure services in the Startup class using dependency injection.
  6. Set Up Middleware: Configure middleware components in the request processing pipeline.
  7. Run and Debug: Use the development environment to run and debug the application locally.


  1. Performance: High performance and scalable applications.
  2. Cross-Platform: Develop and deploy on multiple platforms.
  3. Unified Framework: Single framework for web and API development.
  4. Modern Development Practices: Encourages best practices like dependency injection and modular design.
  5. Community and Support: Strong community and extensive documentation.


  1. Learning Curve: Steeper learning curve for developers new to .NET or coming from older ASP.NET versions.
  2. Migration: Migrating existing applications from older ASP.NET frameworks can be challenging.
  3. Platform-Specific Issues: Cross-platform compatibility can introduce subtle platform-specific issues.

Use Cases

  1. Web Applications: Building dynamic and responsive web applications.
  2. APIs: Creating RESTful services and APIs.
  3. Real-Time Applications: Using SignalR for real-time functionality like chat applications.
  4. Microservices: Developing microservices architectures due to its lightweight and modular design.

ASP.NET Core is a powerful and flexible framework for building modern web applications and services, leveraging the latest advancements in .NET technology to deliver high performance, scalability, and maintainability.

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