Microsoft has just launched .NET 9, introducing significant advancements within ASP.NET Core 9 that are sure to enhance your development experience! This new version not only boosts performance but also simplifies workflows while expanding the framework’s versatility to meet modern application needs.

Blazor Gets a Major Upgrade!

One of the standout features in this release is the revamped Blazor framework. Developers now have access to a new runtime API that allows them to query component states, significantly improving performance troubleshooting and making it easier to optimize applications. A notable addition is the [ExcludeFromInteractiveRouting] attribute, which allows for static server-side rendering (SSR) to be implemented more efficiently—perfect for legacy applications that thrive on classical HTTP request cycles rather than interactive rendering.

Optimize Your Static Assets Like Never Before!

The introduction of MapStaticAssets could revolutionize the way developers handle static resources. This feature automates the lifecycle of assets, providing automatic compression, caching, and version management without the need for manual setup. By integrating build and publish metadata seamlessly, it enhances how static assets are served across various frameworks like Blazor, Razor Pages, and MVC applications. Plus, those who prefer managing external or dynamic resources can still use the UseStaticFiles method effortlessly.

Example of implementing MapStaticAssets: ```csharp var builder = WebApplication.CreateBuilder(args); builder.Services.AddRazorPages(); var app = builder.Build(); app.UseHttpsRedirection(); app.MapStaticAssets(); ```

SignalR: Polymorphic and Performance-Enhanced!

SignalR has undergone impressive improvements too. Now, it accommodates polymorphic hub method arguments, allowing methods to accept base class types and handle derived types seamlessly. Improved activity tracking with detailed event generation for each hub method makes it easier than ever to maintain performance. Plus, support for trimming and Native AOT (Ahead-of-Time) compilation means applications are not just smaller; they run faster on both client and server sides, helping you deliver superior user experiences!

Enhanced Error Handling with Minimal APIs

The new tools for Minimal APIs allow for more structured error handling, introducing TypedResults for more precise response types, including handling HTTP 500 Internal Server Errors elegantly through the following code snippet: ```csharp var app = WebApplication.Create(); app.MapGet("/", () => TypedResults.InternalServerError("An error occurred.")); app.Run(); ```

Simplified OpenAPI Support

The release also boasts built-in OpenAPI document generation through the new Microsoft.AspNetCore.OpenApi package. This feature allows for straightforward generation of OpenAPI documents for both controller-based and minimal APIs with minimal setup. While it replaces SwaggerGen's functionality, the UI component found in SwaggerUI won’t be included out of the box—but you can still integrate it manually if needed. Developer GaussZ on Reddit highlighted this change: "The OpenAPI support is designed to streamline the backend, not replace SwaggerUI, which can still be used separately for enhanced visualization."

Strengthening Authentication and Authorization

Last but not least, updates to authentication and authorization now encompass Pushed Authorization Requests (PAR) within OpenID Connect workflows, offering developers greater customization of parameters in OAuth and OpenID Connect handlers, leading to finer control over authentication processes.

Conclusion

With these revolutionary updates in ASP.NET Core 9, developers can look forward to a more powerful, flexible, and streamlined platform for building modern web applications. Whether you're enhancing an existing app or starting a new project, these features are bound to elevate your development experience to unprecedented heights! Don't miss out—dive into ASP.NET Core 9 today and unleash your creativity!