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 · 2025-11-11T05:02:46Z

The CI failures are related to #907 which 🤞 will not be a problem once .NET 10 RTW ships

cc @ErikEJ

Copilot

Pull Request Overview

This PR adds .NET 10 (preview) as the default target framework moniker (TFM) and enables multi-targeting for .NET 8.0, 9.0, and 10.0 across all source projects in the .NET Aspire Community Toolkit.

Key Changes:

Updated DefaultTargetFramework from net8.0 to net10.0 in build configuration
Configured multi-targeting to net10.0;net8.0;net9.0 for all source projects
Updated all CI/CD workflows, composite actions, and development environment to support .NET 10 SDK

Reviewed Changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Directory.Build.props	Changed default TFM to net10.0, enabled multi-targeting for net10.0/net8.0/net9.0, updated DotNetExtensionsVersion to 10.0 RC, added NuGet audit suppression
Directory.Packages.props	Consolidated package versions to use DotNetExtensionsVersion variable, removed .NET 9 overrides section, added System.Linq packages for KurrentDB support
global.json	Enabled prerelease SDK support for .NET 10
src/CommunityToolkit.Aspire.Hosting.SqlDatabaseProjects/CommunityToolkit.Aspire.Hosting.SqlDatabaseProjects.csproj	Extended Aspire issue #7779 workaround condition to include net10.0
src/CommunityToolkit.Aspire.Hosting.SqlServer.Extensions/CommunityToolkit.Aspire.Hosting.SqlServer.Extensions.csproj	Extended Aspire issue #7779 workaround condition to include net10.0
src/CommunityToolkit.Aspire.KurrentDB/CommunityToolkit.Aspire.KurrentDB.csproj	Added conditional System.Linq.AsyncEnumerable reference for net8.0/net9.0
src/CommunityToolkit.Aspire.Hosting.KurrentDB/CommunityToolkit.Aspire.Hosting.KurrentDB.csproj	Added conditional System.Linq.AsyncEnumerable reference for net8.0/net9.0
tests/CommunityToolkit.Aspire.KurrentDB.Tests/CommunityToolkit.Aspire.KurrentDB.Tests.csproj	Added conditional System.Linq.AsyncEnumerable reference for net8.0/net9.0
tests/CommunityToolkit.Aspire.Testing/ConformanceTests.cs	Added guard to skip test when no log categories are specified
tests/CommunityToolkit.Aspire.SurrealDb.Tests/ConformanceTests.cs	Added CanCreateClientWithoutConnectingToServer property override, fixed whitespace formatting
tests-app-hosts/Ollama.AppHost/Ollama.AppHost.csproj	Updated explicit TargetFramework to net10.0
examples/powershell/CommunityToolkit.Aspire.PowerShell.AppHost/CommunityToolkit.Aspire.PowerShell.AppHost.csproj	Removed redundant TargetFramework, ImplicitUsings, and Nullable properties to inherit from Directory.Build.props
examples/masstransit-rabbitmq/CommunityToolkit.Aspire.MassTransit.RabbitMQ.Publisher/CommunityToolkit.Aspire.MassTransit.RabbitMQ.Publisher.csproj	Removed redundant properties to inherit from Directory.Build.props
examples/masstransit-rabbitmq/CommunityToolkit.Aspire.MassTransit.RabbitMQ.MessageTypes/CommunityToolkit.Aspire.MassTransit.RabbitMQ.MessageTypes.csproj	Removed redundant properties to inherit from Directory.Build.props
.github/workflows/dotnet-main.yml	Changed DEFAULT_DOTNET_VERSION from 8.0.x to 10.0.x
.github/workflows/dotnet-release.yml	Changed DEFAULT_DOTNET_VERSION from 8.0.x to 10.0.x
.github/workflows/codeql.yml	Added 10.0.x to dotnet-version list
.github/workflows/package.yml	Added 10.0.x to dotnet-version list
.github/workflows/generate-api-diffs.yml	Added 10.0.x to dotnet-version list, updated build target from net8.0 to net10.0
.github/actions/setup-runtimes-caching/action.yml	Added 10.0.x to dotnet-version list, replaced linux-dev-certs tool with dotnet dev-certs
.devcontainer/devcontainer.json	Updated primary .NET version to 10.0, added installUsingApt:false configuration
.devcontainer/post-create.sh	Replaced linux-dev-certs tool with dotnet dev-certs

Copilot · 2025-11-11T05:09:12Z

tests-app-hosts/Ollama.AppHost/Ollama.AppHost.csproj

  <PropertyGroup>
    <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>


The explicit TargetFramework setting here is inconsistent with the approach used in other AppHost projects. Most example AppHost projects (e.g., examples/powershell/CommunityToolkit.Aspire.PowerShell.AppHost) have removed explicit TargetFramework settings to inherit from Directory.Build.props. Consider removing this line to maintain consistency and allow the framework to be inherited from DefaultTargetFramework.

Suggested change

<TargetFramework>net10.0</TargetFramework>

Copilot · 2025-11-11T05:09:13Z

tests-app-hosts/Ollama.AppHost/Ollama.AppHost.csproj

    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>


Similar to the pattern used in other AppHost projects, consider removing the explicit ImplicitUsings and Nullable properties as they are already set in Directory.Build.props (lines 11-12) and will be inherited automatically.

Suggested change

<ImplicitUsings>enable</ImplicitUsings>

<Nullable>enable</Nullable>

Copilot · 2025-11-11T05:09:13Z

Directory.Packages.props

-    <PackageVersion Include="Microsoft.Extensions.Options" Version="9.0.10" />
+
+  <ItemGroup Label="System">
+    <PackageVersion Include="System.Linq.Async" Version="6.0.1" />


The new "System" ItemGroup label lacks context for why System.Linq.Async has ExcludeAssets set to all while System.Linq.AsyncEnumerable is conditionally included in specific projects. Consider adding a comment explaining that System.Linq.Async is excluded here to avoid transitive dependencies, and that System.Linq.AsyncEnumerable is conditionally referenced for .NET 8.0/9.0 only as the functionality is built-in to .NET 10.

Suggested change

<PackageVersion Include="System.Linq.Async" Version="6.0.1" />



<PackageVersion Include="System.Linq.Async" Version="6.0.1" ExcludeAssets="all" />

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 force-pushed the copilot/add-dotnet-10-tfm-support branch from f10b449 to f3ff1ff Compare November 10, 2025 23:45

aaronpowell added 2 commits November 11, 2025 00:50

skipping tests which would do nothing

dc27f09

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

ce0d983

aaronpowell marked this pull request as ready for review November 11, 2025 05:01

aaronpowell requested review from Alirexaa and MichielBrys as code owners November 11, 2025 05:01

Copilot AI review requested due to automatic review settings November 11, 2025 05:01

aaronpowell requested review from ErikEJ and jmezach as code owners November 11, 2025 05:01

Copilot started reviewing on behalf of aaronpowell November 11, 2025 05:02 View session

Copilot finished reviewing on behalf of aaronpowell November 11, 2025 05:05

Copilot AI reviewed Nov 11, 2025

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

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		<ImplicitUsings>enable</ImplicitUsings>
		<Nullable>enable</Nullable>

-    <PackageVersion Include="System.Linq.Async" Version="6.0.1" />
+    <!--
+      System.Linq.Async is referenced with ExcludeAssets="all" to avoid introducing transitive dependencies.
+      System.Linq.AsyncEnumerable is conditionally referenced for .NET 8.0/9.0 only, as the functionality is built-in to .NET 10.
+    -->
+    <PackageVersion Include="System.Linq.Async" Version="6.0.1" ExcludeAssets="all" />

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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