ABP Now Supports .NET 9

Cover image

.NET 9.0.100-rc.2 has been released on October 8, 2024. To align with the latest .NET, we also released the ABP Platform 9.0.0-rc.1 version.
With this release, ABP now supports .NET 9.

The .NET 9 stable version is planned to be released on November 12, 2024 before the .NET Conf 2024 event. The ABP 9.0 stable version is planned to be released on November 19, 2024.

.NET 9 Releases

In the following link, you can find a list of all .NET 9 releases with direct links to release notes and announcements/discussions:

ABP Supports Both .NET 8 & .NET 9

The ABP 9.0 version fully supports .NET 9 within our new templates and modules. For developers who want to update their ABP packages to the latest but want to keep them in .NET 8, we support both .NET 8 and .NET 9 in ABP 9. In your host application, you can choose your target framework.

So you can decide which version you want to use in your startup Host Application’s <TargetFramework> tag.

In this link you can see that netstandard2.0/2.1 and net8/9 are supported.

<Project Sdk="Microsoft.NET.Sdk">
    <TargetFrameworks>
      netstandard2.0;netstandard2.1;net8.0;net9.0
    </TargetFrameworks>
</Project>

New ASP.NET Core Middleware: Static Asset Delivery

MapStaticAssets is a new middleware that helps optimize the delivery of static assets in any ASP.NET Core app, including Blazor apps. With this change, some JavaScript/CSS/Images files exist in the Virtual File System, but the new ASP.NET Core 9 MapStaticAssets can't handle them. You need to add StaticFileMiddleware to serve these files. In ABP 9, we added MapAbpStaticAssetsan extension method to support the new MapStaticAssets. You can read about this new feature at this link.
ABP’s new extension method is available here.

How to Upgrade from .NET 8 to .NET 9:

Install the latest .NET 9 SDK from this link.
Upgrade dotnet-ef tool version with the following command:

dotnet tool uninstall --global dotnet-ef && dotnet tool install --global dotnet-ef

EF Core Upgrade

  1. Change all TargetFramework tags from net8.0 to net9.0.
  2. Upgrade all Microsoft NuGet packages to 9.0.0.
  3. If you have global.json, update dotnetversion to 9.0.0 .
  4. Replaceapp.UseStaticFiles() to app.MapAbpStaticAssets() in your module classes and startup projects.
    See the related changes in the repository.

What’s new with .NET 9

.NET 9 Blazor New Features

.NET 9 Performance Improvements Summary

What’s new in .NET 9 (Microsoft’s post)

We Are Eating Our Own Dog Food

Before we release any version of ABP, we test our upcoming version on our sample apps and live website https://abp.io. The ABP.io website is also built on top of the ABP Framework, and you can see that we have already started to use .NET 9-rc.2 on our live website.

Eating our own dog food

Microsoft .NET Support Policy

Lastly, I want to mention Microsoft's .NET support policy.

  • .NET 7 support has been finished on May 2024.
  • .NET 8 will be supported until November 2026.
  • .NET 9 is on the standard term support, which means Microsoft will release patches until May 2026.

Find detailed information about the .NET support policy at this link.

.NET Core Official Support Policy

Finally

.NET 9 is making a significant impact. It introduces features like Native AOT for faster applications, enhanced AI integration and improved tools for cloud-native and cross-platform development, all aimed at simplifying developers’ work. Whether you’re handling small projects or large-scale enterprise applications, it offers enhancements that elevate your productivity by just upgrading your .NET version to 9.0