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What is ASP.NET Core, and how is it different from ASP.NET?

ASP.NET Core is a modern, open-source, and cross-platform web framework developed by Microsoft. It is a part of the .NET Core platform and is designed to build web applications, APIs, and microservices that can run on various platforms, including Windows, macOS, and Linux.

Key features of ASP.NET Core include:

  1. Cross-Platform Compatibility: ASP.NET Core is built on top of .NET Core, which makes it cross-platform. It allows developers to build and run web applications on different operating systems, providing greater flexibility in deployment.
  2. Modular and Lightweight: ASP.NET Core follows a modular design, and developers can use only the required components (NuGet packages) for their web applications. This lightweight approach results in better performance and reduced overhead.
  3. Improved Performance: ASP.NET Core has been optimized for high performance, offering faster application startup times and improved response times compared to the traditional ASP.NET.
  4. Unified MVC and Web API Framework: ASP.NET Core combines the functionalities of ASP.NET MVC (Model-View-Controller) and ASP.NET Web API into a single framework, making it easier to build both web pages and APIs within the same application.
  5. Middleware Pipeline: ASP.NET Core uses a middleware pipeline that allows developers to handle requests and responses at different stages in the processing pipeline. This makes it easier to add cross-cutting concerns, such as authentication, logging, and exception handling.
  6. Dependency Injection (DI): ASP.NET Core natively supports Dependency Injection, making it easier to manage dependencies and improve testability and maintainability of the application.
  7. Support for Modern Web Standards: ASP.NET Core is designed to support modern web standards and follows the latest web development best practices, including support for WebSockets and SignalR for real-time communication.
  8. Razor Pages: ASP.NET Core introduces Razor Pages, a page-based programming model that simplifies building simple web pages without the need for a full MVC architecture.

Differences between ASP.NET Core and ASP.NET:

  1. Platform Compatibility: ASP.NET Core is cross-platform and can run on Windows, macOS, and Linux, while traditional ASP.NET applications are primarily designed to run on Windows operating systems.
  2. Framework Dependency: ASP.NET Core relies on .NET Core, which is a leaner and more modular framework, while traditional ASP.NET applications depend on the full .NET Framework, which is more extensive and Windows-specific.
  3. Performance: ASP.NET Core is designed with performance optimization in mind and is generally faster than traditional ASP.NET due to its lightweight architecture and improved request processing.
  4. MVC and Web API Integration: ASP.NET Core integrates the functionalities of MVC and Web API into a unified framework, allowing developers to build web pages and APIs using the same set of tools and concepts.
  5. Middleware Pipeline: ASP.NET Core introduces a middleware pipeline, providing more control over the request/response processing, while traditional ASP.NET uses HTTP modules and handlers.
  6. Dependency Injection: ASP.NET Core natively supports Dependency Injection, which is more robust and flexible compared to the earlier dependency resolution mechanisms in traditional ASP.NET.

Overall, ASP.NET Core offers a modern and lightweight alternative to traditional ASP.NET, providing cross-platform support, improved performance, and enhanced development capabilities. It is well-suited for building web applications and APIs that can run on various platforms, making it a preferred choice for modern web development.

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