[Problem/Bug]: Found conflicts between different versions of "WindowsBase" that could not be resolved

[mikemeinz]

What happened?

I upgraded a .NET Framework 4.8.1 VB .NET app that uses WebView2 to use .NET 9.0. Now, I get the following warning message when I build the project. My project does not use WPF. My project only uses WinForms.

5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277: Found conflicts between different versions of "WindowsBase" that could not be resolved.
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277: There was a conflict between "WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" and "WindowsBase, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35".
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:     "WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was chosen because it was primary and "WindowsBase, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was not.
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:     References which depend on "WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" [C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref\net9.0\WindowsBase.dll].
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:         C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref\net9.0\WindowsBase.dll
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:           Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref\net9.0\WindowsBase.dll".
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:             C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref/net9.0/WindowsBase.dll
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:     References which depend on or have been unified to "WindowsBase, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" [].
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:         C:\Users\MikeMeinz\.nuget\packages\microsoft.web.webview2\1.0.2903.40\lib_manual\net5.0-windows10.0.17763.0\Microsoft.Web.WebView2.Wpf.dll
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:           Project file item includes which caused reference "C:\Users\MikeMeinz\.nuget\packages\microsoft.web.webview2\1.0.2903.40\lib_manual\net5.0-windows10.0.17763.0\Microsoft.Web.WebView2.Wpf.dll".
5>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:             C:\Users\MikeMeinz\.nuget\packages\microsoft.web.webview2\1.0.2903.40\buildTransitive\..\\lib_manual\net5.0-windows10.0.17763.0\Microsoft.Web.WebView2.Wpf.dll

That is the only error or warning message from the build process.

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Version 17.12.1
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Version 4.8.09032

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Importance

Blocking. My app's basic functions are not working due to this issue.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

131.0.2903.70

SDK Version

1.0.2903.40

Framework

Winforms

Operating System

Windows 11

OS Version

22631.4037

Repro steps

Rebuild and run program in Debug mode.

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

Don't know

Last working version (if regression)

No response