Add .NET 10 (preview) as the default TFM and enable multi-targeting builds #949

Copilot · 2025-11-06T05:00:56Z

Closes #

Adds net10.0 as the default target framework moniker (TFM) and enables multi-targeting for .NET 8.0, 9.0, and 10.0 (preview) across all source projects.

Changes Made

Build Configuration

Directory.Build.props:
- Changed DefaultTargetFramework from net8.0 to net10.0
- Set AllTargetFrameworks to net10.0;net8.0;net9.0
Directory.Packages.props: Added .NET 10 Overrides section using 9.0.10 package versions for compatibility during preview phase
global.json: Enabled prerelease SDK support (allowPrerelease: true)
Project workarounds: Extended existing .NET 9.0 conditions to include 10.0 in SqlDatabaseProjects and SqlServer.Extensions projects (Aspire issue #7779 workaround)

GitHub Actions Workflows

Updated all workflows and composite actions to install and support .NET 10:

dotnet-main.yml and dotnet-release.yml: Changed DEFAULT_DOTNET_VERSION to 10.0.x
codeql.yml, package.yml, and generate-api-diffs.yml: Added 10.0.x to dotnet-version lists
generate-api-diffs.yml: Updated build target from net8.0 to net10.0
setup-runtimes-caching/action.yml: Added 10.0.x to dotnet-version list in the composite action

Development Environment

devcontainer.json: Updated to install .NET 10 preview as the primary SDK version with .NET 8.0 and 9.0 as additional versions

Impact

Default TFM: .NET 10 is now the primary framework (affects examples and tests)
Source Projects: All src/ projects multi-target to net10.0, net8.0, and net9.0
CI/CD: All GitHub Actions workflows and composite actions now install and build with .NET 10 preview
Development Environment: Devcontainer now installs .NET 10 preview as the primary SDK
NuGet Packages: Will include binaries for all three target frameworks

PR Checklist

Other information

This change enables .NET 10 preview as the default framework. The repository now requires .NET 10 SDK (preview) for building. All CI/CD workflows, composite actions, and the development environment (devcontainer) have been updated to install .NET 10 preview alongside .NET 8 and 9 for multi-targeting support.

Original prompt

Add .NET 10 (currently preview) as a TFM that is used in the multi-targetting builds

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

Co-authored-by: aaronpowell <[email protected]>

aaronpowell · 2025-11-06T05:21:55Z

@copilot can you make the default TFM .NET 10 and also ensure any GitHub Actions that install .NET are installing .NET 10 as well

…ET 10 Co-authored-by: aaronpowell <[email protected]>

Copilot · 2025-11-06T05:27:45Z

@copilot can you make the default TFM .NET 10 and also ensure any GitHub Actions that install .NET are installing .NET 10 as well

Done! I've made the following changes in commit 303a76f:

Changed default TFM to .NET 10:
- DefaultTargetFramework is now net10.0
- AllTargetFrameworks reordered to net10.0;net8.0;net9.0
- Enabled prerelease SDKs in global.json
Updated GitHub Actions to install .NET 10:
- dotnet-main.yml and dotnet-release.yml: Changed DEFAULT_DOTNET_VERSION to 10.0.x
- codeql.yml, package.yml, and generate-api-diffs.yml: Added 10.0.x to the dotnet-version list
- generate-api-diffs.yml: Updated build target from net8.0 to net10.0

All examples, tests, and the default build now use .NET 10 as the primary framework.

aaronpowell · 2025-11-06T05:40:01Z

@copilot can you also ensure the devcontainer will install .NET 10 as preview

Co-authored-by: aaronpowell <[email protected]>

Copilot · 2025-11-06T05:42:56Z

@copilot can you also ensure the devcontainer will install .NET 10 as preview

Done! Updated the devcontainer configuration in commit c6b19fc:

Changed primary .NET version from 8.0 to 10.0
Updated additionalVersions to include 8.0,9.0
Added installUsingApt: false to ensure preview versions are installed from Microsoft's feeds

The devcontainer will now install .NET 10 preview as the primary SDK with .NET 8 and 9 as additional versions.

aaronpowell · 2025-11-06T05:54:12Z

@copilot missed one place to install .NET 10 - the action.yml in .github/actions/setup-runtimes-caching

Co-authored-by: aaronpowell <[email protected]>

Copilot · 2025-11-06T05:56:48Z

@copilot missed one place to install .NET 10 - the action.yml in .github/actions/setup-runtimes-caching

Fixed in commit 1e4e20d. Added 10.0.x to the dotnet-version list in .github/actions/setup-runtimes-caching/action.yml.

… but the MassTransit.ActiveMQ package isn't updated yet Tracked: MassTransit/MassTransit#6133

…ss ambiguous referencing

…able

I feel dirty doing that...

aaronpowell · 2025-11-12T04:55:45Z

@ErikEJ @jmezach either of you able to look at the SQL db project errors - https://github.com/CommunityToolkit/Aspire/actions/runs/19286737811/job/55149036924?pr=949#step:6:88

Could it be because the SDK package isn't supporting .NET 10?

ErikEJ · 2025-11-12T07:36:35Z

@aaronpowell The 3.2.0 SDK supports .NET 10 just fine. Not sure what is specific about the single failing test?

@jmezach Thoughts?

aaronpowell · 2025-11-12T07:46:46Z

@aaronpowell The 3.2.0 SDK supports .NET 10 just fine. Not sure what is specific about the single failing test?

@jmezach Thoughts?

Oh bugger. I saw something on the sdk repo about cutting a release, thought it might be related

ErikEJ · 2025-11-12T07:49:15Z

@aaronpowell Ah, we have used .NET 10 SDK for a few months now, the issue was just about cutting a release based on the RTM SDK and with the latest DacFX package, for the best SQL Server 2025 support

jmezach · 2025-11-12T09:02:16Z

@ErikEJ @aaronpowell I'm wondering if this might be related to the Microsoft.Build.Locator package that we're using to find an MSBuild instance on the local machine in order to read the project file. Perhaps we need to update that package as well in order to support .NET 10 here?

aaronpowell · 2025-11-12T09:19:18Z

Which package is that?

jmezach · 2025-11-12T09:28:49Z

@aaronpowell https://www.nuget.org/packages/Microsoft.Build.Locator. It is referenced here:

Aspire/Directory.Packages.props

Line 82 in 2b1757e

ErikEJ · 2025-11-12T09:40:06Z

@jmezach But is that not the latest version already?

jmezach · 2025-11-12T09:45:11Z

1.10.12 is the latest version, we're currently using 1.10.2

ErikEJ · 2025-11-12T09:47:35Z

@jmezach Ah - number blindness! 😄

aaronpowell · 2025-11-12T10:01:34Z

Ah, thought I'd bumped it. Wanna bump to latest and see what CI dpes

Alirexaa · 2025-11-12T11:20:54Z

examples/sql-database-projects/SdkProject/SdkProject.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="MSBuild.Sdk.SqlProj/3.2.0">
    <PropertyGroup>
-        <TargetFramework>$(DefaultTargetFramework)</TargetFramework>


This change likely caused the test failure. We encountered a similar issue with .NET 9 support last year; multi-targeting was incompatible with SqlProj then.

#182 (comment)

Yes, this needs to remain

Yeah that's my bad, I was doing a bunch of stuff trying to force target frameworks and forgot what I had done

Initial plan

4e9036e

Copilot AI assigned Copilot and aaronpowell Nov 6, 2025

Copilot started work on behalf of aaronpowell November 6, 2025 05:01 View session

Add .NET 10 (preview) as a TFM for multi-targeting builds

7236d38

Co-authored-by: aaronpowell <[email protected]>

Copilot AI changed the title ~~[WIP] Add .NET 10 as a TFM for multi-targeting builds~~ Add .NET 10 (preview) as a TFM for multi-targeting builds Nov 6, 2025

Copilot AI requested a review from aaronpowell November 6, 2025 05:19

Copilot finished work on behalf of aaronpowell November 6, 2025 05:19

Copilot started work on behalf of aaronpowell November 6, 2025 05:22 View session

Change default TFM to .NET 10 and update GitHub Actions to install .N…

303a76f

…ET 10 Co-authored-by: aaronpowell <[email protected]>

Copilot AI changed the title ~~Add .NET 10 (preview) as a TFM for multi-targeting builds~~ Add .NET 10 (preview) as the default TFM and enable multi-targeting builds Nov 6, 2025

Copilot finished work on behalf of aaronpowell November 6, 2025 05:29

Copilot started work on behalf of aaronpowell November 6, 2025 05:40 View session

Update devcontainer to install .NET 10 as preview

c6b19fc

Co-authored-by: aaronpowell <[email protected]>

Copilot finished work on behalf of aaronpowell November 6, 2025 05:44

Copilot started work on behalf of aaronpowell November 6, 2025 05:54 View session

Add .NET 10 to setup-runtimes-caching action

1e4e20d

Co-authored-by: aaronpowell <[email protected]>

Copilot finished work on behalf of aaronpowell November 6, 2025 05:59

aaronpowell added 6 commits November 6, 2025 22:55

Fixing some versioning

ac50650

Hard coding an update to use [email protected] as 2.2.0 has a CVE…

9441794

… but the MassTransit.ActiveMQ package isn't updated yet Tracked: MassTransit/MassTransit#6133

Fixing some projects that specified their own TFM and trying to addre…

ef89379

…ss ambiguous referencing

Using an improved approach approach to adding system.linq.asyncenumer…

e66de71

…able

Updating how dev certs are setup

51e57ba

Turns out you can't upgrade around the CVE, so we now suppress it

f3ff1ff

I feel dirty doing that...

aaronpowell added 3 commits November 12, 2025 10:20

Setting target frameworks too

3a3128d

Merge branch 'main' into copilot/add-dotnet-10-tfm-support

7ab3be8

Moving to the new sdk structure

87c71c6

aaronpowell requested review from FullStackChef, Harold-Morgan, WhitWaldo, esskar, fboucher, justinyoo, martinjt, paule96, shiranshalom and tommasodotNET as code owners November 12, 2025 04:05

aaronpowell added 4 commits November 12, 2025 04:07

how'd I miss that merge

7919020

Can't have Aspire.Hosting.AppHost in CPM as it's implicitly added

f6d32e9

Back to zero compiler errors, woo

5349300

Removing the .net down levelling there too

809b171

Missed another reference to the apphost package

6a73db8

Alirexaa reviewed Nov 12, 2025

View reviewed changes

Add .NET 10 (preview) as the default TFM and enable multi-targeting builds #949

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Add .NET 10 (preview) as the default TFM and enable multi-targeting builds #949

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Changes Made

Build Configuration

GitHub Actions Workflows

Development Environment

Impact

PR Checklist

Other information

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