Use live runtime references for vcxproj

[ViktorHofer]

Fixes #9490
Unblocks dotnet/sdk#43015

When building wpf inside the VMR, a 10.0.100 SDK is used. WPF currently still targets net9.0. As WPF directly depends on runtime, it already uses 10.0.0-alpha versions of the targeting and runtime packs for managed projects.

Enable this for vcxprojs as well so that the host packages can also be restored from the flowing runtime dependency.

Fixes errors like these:

The Apphost pack is not installed and NuGet package restore is not supported. Upgrade Visual Studio, remove global.json if it specifies a certain SDK version, and uninstall the newer SDK. For more options visit https://aka.ms/targeting-apphost-pack-missing Pack Type:Apphost, Pack directory: D:\a_work\1\vmr.dotnet\packs\Microsoft.NETCore.App.Host.win-x64, targetframework: net9.0, Pack PackageId: Microsoft.NETCore.App.Host.win-x64, Pack Package Version: 9.0.0-rc.2.24473.5

Fixes #

Main PR

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Regression

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Microsoft Reviewers: Open in CodeFlow

[ViktorHofer]

Unfortunately this doesn't work:

C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\CommonExtensions\Microsoft\NuGet\NuGet.targets(751,5): error : Unexpected failure reading NuGet.Confi
g. Path: 'C:\Program Files (x86)\NuGet\Config\Microsoft.VisualStudio.Offline.config'. [C:\git\wpf\src\Microsoft.DotNet.Wpf\src\Themes\PresentationFramework.Luna\Presen
tationFramework.Luna.csproj]
C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\CommonExtensions\Microsoft\NuGet\NuGet.targets(751,5): error :   The process cannot access the file '
C:\Program Files (x86)\NuGet\Config\Microsoft.VisualStudio.Offline.config' because it is being used by another process. [C:\git\wpf\src\Microsoft.DotNet.Wpf\src\Themes
\PresentationFramework.Luna\PresentationFramework.Luna.csproj]
C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\CommonExtensions\Microsoft\NuGet\NuGet.targets(751,5): error : Unexpected failure reading NuGet.Confi
g. Path: 'C:\Program Files (x86)\NuGet\Config\Microsoft.VisualStudio.Offline.config'. [C:\git\wpf\src\Microsoft.DotNet.Wpf\tests\UnitTests\System.Xaml.Tests\System.Xam
l.Tests.csproj]
C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\CommonExtensions\Microsoft\NuGet\NuGet.targets(751,5): error :   The process cannot access the file '
C:\Program Files (x86)\NuGet\Config\Microsoft.VisualStudio.Offline.config' because it is being used by another process. [C:\git\wpf\src\Microsoft.DotNet.Wpf\tests\Unit
Tests\System.Xaml.Tests\System.Xaml.Tests.csproj]

cc @ericstj as you might have ideas

[ViktorHofer]

Submitted #10030 as a workaround until this PR gets in.

[ericstj]

That error is odd - I would expect that file to be opened for read only (since build processes should never write to such global files) - I wonder if NuGet is missing a sharing permission when opening this file?

[ViktorHofer]

That error is odd - I would expect that file to be opened for read only (since build processes should never write to such global files) - I wonder if NuGet is missing a sharing permission when opening this file?

Others are hitting this as well in different repos. We have an offline conversation going about this. This seems to be Defender related.

@ericstj I'm not sure how to avoid the current failures. It looks like the vcxprojs use the net9.0-windows7.0 TFM but everything else just uses the net9.0 TFM. Any idea whether the vcxprojs need to use that TargetPlatformMoniker? Unsure if there's a better person to ask this.