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.NET 9 中的 OpenAPI 文档生成

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Introduction

OpenAPI is a powerful tool for defining and documenting HTTP APIs, providing a standardized way to describe API endpoints, request and response formats, authentication schemes, and other important details. The widespread use of OpenAPI has led to a rich ecosystem of tools and services that can help build, test, and document APIs more efficiently.

Why Choose OpenAPI?

OpenAPI simplifies API interactions, fosters better collaboration, and enables the use of Large Language Models (LLMs) to accelerate development processes by training on OpenAPI documents.

What's New in .NET 9?

In .NET 9, built-in support for OpenAPI document generation has been introduced, making it easier for .NET developers to create OpenAPI documents for API endpoints. Key highlights include runtime generation of OpenAPI documents, attribute and extension method support for adding metadata to API methods and data, converter APIs for modifying generated documents, and compatibility with Minimal API and native Ahead-of-Time (AoT) compilation.

Getting Started

  1. Upgrade to .NET 9: Ensure your project is using the latest .NET 9 version.
  2. Enable OpenAPI Support: Add the Microsoft.AspNetCore.OpenApi package and configure the OpenAPI service in your main application file.
  3. Add Endpoints: Define your endpoints and serve the generated OpenAPI document using extension methods.
  4. Add OpenAPI Metadata: Add descriptions, tags, examples, and other metadata to API methods and data using attributes or extension methods.
  5. Customize Documentation: Customize the generated OpenAPI document using converters to modify the document, operations, or schemas.
  6. Build-Time Generation: Optionally generate OpenAPI documents as part of the build process.

Summary

The new OpenAPI document generation in .NET 9 simplifies the process of creating and maintaining API documentation for ASP.NET applications. By integrating this feature directly into ASP.NET Core, developers can now generate OpenAPI documents at build time or runtime, customize them as needed, and ensure they stay in sync with the codebase. This feature is fully compatible with Minimal API applications and native AoT compilation, providing a streamlined experience for developers.

We look forward to hearing your feedback on this new feature. Give it a try and let us know your thoughts. Happy coding!