.NET 6 Preview 4 is now available and includes many great new improvements to ASP.NET Core.

Here’s what’s new in this preview release:

• Introducing minimal APIs
• Async streaming
• HTTP logging middleware
• Use Kestrel for the default launch profile in new projects
• IConnectionSocketFeature
• Improved single-page app (SPA) templates
• .NET Hot Reload updates
• Generic type constraints in Razor components
• Blazor error boundaries
• Blazor WebAssembly ahead-of-time (AOT) compilation
• .NET MAUI Blazor apps
• Other performance improvements

Get started

To get started with ASP.NET Core in .NET 6 Preview 4,  install the .NET 6 SDK.

If you’re on Windows using Visual Studio, we recommend  installing the latest preview of Visual Studio 2019 16.11. If you’re on macOS, we recommend  installing the latest preview of Visual Studio 2019 for Mac 8.10.

Upgrade an existing project

To upgrade an existing ASP.NET Core app from .NET 6 Preview 3 to .NET 6 Preview 4:

• Update all Microsoft.AspNetCore.* package references to 6.0.0-preview.4.*.
• Update all Microsoft.Extensions.* package references to 6.0.0-preview.4.*.

See the full list of  breaking changes in ASP.NET Core for .NET 6.

Introducing minimal APIs

In .NET 6, we are introducing minimal APIs for hosting and routing in web applications. This opens the doors for new developers building their first web application with .NET and to our existing customers who want to build small microservices and HTTP APIs. These streamlined APIs provide the benefits of ASP.NET MVC with less ceremony.

To try out creating a minimal API, create a new ASP.NET Core empty web app.

dotnet new web -o MinApi

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