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  • Ship the net10.0 version of our msbuild tasks.
  • This required a bit of a reshuffling of the files in our Sdk pack, since we now
    ship both a netstandard2.0 and a net10.0 version of our msbuild tasks.
  • Use the net10.0 version of the msbuild tasks by default, but allow opt-out using
    the property '_UseDesktopTaskAssemblies'.

Loading the net10.0 version of the tasks should work in VS2026, because VS2026 supports
the "Runtime=NET" metadata on the 'UsingTask' directive (VS2022 does not, but this
doesn't matter, because we don't support VS2022 anymore in .NET 10+).

Hopefully we'll be able to remove the opt-out once we've confirmed nothing breaks,
and then we can remove the netstandard2.0 versions of our task assemblies.

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Pull request overview

This pull request updates the MSBuild build system to ship both netstandard2.0 and net10.0 versions of the MSBuild task assemblies, with net10.0 being the default. The changes introduce new properties _TaskAssemblyName and _TaskRuntime to support loading the appropriate version of task assemblies, with an opt-out mechanism via _UseDesktopTaskAssemblies.

Changes:

  • Added support for shipping both netstandard2.0 and net10.0 task assemblies with configurable selection
  • Updated all UsingTask declarations to include Runtime metadata and use the new _TaskAssemblyName property
  • Modified Makefile to copy net10.0 assemblies to the SDK pack structure

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 5 comments.

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File Description
msbuild/Xamarin.Shared/Xamarin.Shared.targets Added properties to select task assembly version and runtime, updated all UsingTask declarations to use new properties and Runtime attribute
msbuild/Xamarin.iOS.Tasks.Windows/Xamarin.iOS.Windows.After.targets Updated UsingTask declarations to use new Runtime attribute and _TaskAssemblyName property
msbuild/Xamarin.iOS.Tasks.Windows/Xamarin.iOS.ObjCBinding.CSharp.After.targets Updated UsingTask declaration to use new Runtime attribute and _TaskAssemblyName property
msbuild/Xamarin.iOS.Tasks.Windows/Xamarin.iOS.Common.Before.targets Removed UsingTask declaration (moved to Common.After.targets)
msbuild/Xamarin.iOS.Tasks.Windows/Xamarin.iOS.Common.After.targets Added CollectMonotouchReferences UsingTask and updated all declarations with Runtime attribute
msbuild/Xamarin.MacDev.Tasks/Xamarin.MacDev.Tasks.csproj Enabled CopyLocalLockFileAssemblies for net10.0 and disabled ILMerge for net10.0 target
msbuild/Makefile Added NETTARGETFRAMEWORK variable and updated install rules to copy both netstandard2.0 and net10.0 assemblies
msbuild/.gitignore Added .copy-stamp-* to ignore list for build artifacts
dotnet/targets/Xamarin.Shared.Sdk.targets Updated UsingTask declarations to use Runtime attribute and _TaskAssemblyName property
dotnet/targets/Xamarin.Shared.Sdk.props Removed _XamarinTaskAssembly property definition (replaced by _TaskAssemblyName)
dotnet/targets/Microsoft.MaciOS.Sdk.Xcode.targets Updated UsingTask declarations to use Runtime attribute and _TaskAssemblyName property

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* Ship the net10.0 version of our msbuild tasks.
* This required a bit of a reshuffling of the files in our Sdk pack, since we now
  ship both a netstandard2.0 and a net10.0 version of our msbuild tasks.
* Use the net10.0 version of the msbuild tasks by default, but allow opt-out using
  the property '_UseDesktopTaskAssemblies'.

Using the net10.0 version of the msbuild tasks is a good thing because:

* We get to use a much newer version of .NET (which is better for performance).
* We get to use newer APIs and features.
* Task assemblies are loaded in isolation from eachother, we means we don't have
  to use ILMerge to merge dependencies into a single assembly, simplifying the build
  process: https://github.com/dotnet/msbuild/blob/main/documentation/specs/task-isolation-and-dependencies.md

Loading the net10.0 version of the tasks should work in VS2026, because VS2026 supports
the "Runtime=NET" metadata on the 'UsingTask' directive (VS2022 does not, but this
doesn't matter, because we don't support VS2022 anymore in .NET 10+).

Hopefully we'll be able to remove the opt-out once we've confirmed nothing breaks,
and then we can remove the netstandard2.0 versions of our task assemblies.
@rolfbjarne rolfbjarne force-pushed the dev/rolf/msbuild-dotnet-host branch from 39f84ad to 242e7d3 Compare January 26, 2026 08:17
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✅ [CI Build #98c877d] Build passed (Build packages) ✅

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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✅ [PR Build #98c877d] Build passed (Detect API changes) ✅

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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✅ API diff for current PR / commit

NET (empty diffs)

✅ API diff vs stable

NET (empty diffs)

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Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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✅ [CI Build #98c877d] Build passed (Build macOS tests) ✅

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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💻 [CI Build #98c877d] Tests on macOS X64 - Mac Sonoma (14) passed 💻

All tests on macOS X64 - Mac Sonoma (14) passed.

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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💻 [CI Build #98c877d] Tests on macOS M1 - Mac Monterey (12) passed 💻

All tests on macOS M1 - Mac Monterey (12) passed.

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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💻 [CI Build #98c877d] Tests on macOS M1 - Mac Ventura (13) passed 💻

All tests on macOS M1 - Mac Ventura (13) passed.

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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💻 [CI Build #98c877d] Tests on macOS arm64 - Mac Sequoia (15) passed 💻

All tests on macOS arm64 - Mac Sequoia (15) passed.

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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💻 [CI Build #98c877d] Tests on macOS arm64 - Mac Tahoe (26) passed 💻

All tests on macOS arm64 - Mac Tahoe (26) passed.

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Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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🔥 [CI Build #98c877d] Test results 🔥

Test results

❌ Tests failed on VSTS: test results

1 tests crashed, 1 tests failed, 113 tests passed.

Failures

❌ windows tests

🔥 Failed catastrophically on VSTS: test results - windows (no summary found).

Html Report (VSDrops) Download

❌ xcframework tests

1 tests failed, 3 tests passed.

Failed tests

  • xcframework-test/tvOS - simulator/Debug: Crashed

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Successes

✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ generator: All 5 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 4 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 9 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 11 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 9 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 9 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

Pipeline on Agent
Hash: 98c877db4ed7a5bb465fd795a9a8875fd63f429b [PR build]

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