[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.

Visual Studio Help / About / Installed Products
Microsoft Visual Studio Community 2022
Version 17.12.1
VisualStudio.17.Release/17.12.1+35514.174
Microsoft .NET Framework
Version 4.8.09032

Installed Version: Community

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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

[mbodm]

Hi,

same here (or at least rather similar):

C:\Program Files\dotnet\sdk\9.0.100\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:
  Es wurden Konflikte zwischen verschiedenen Versionen von "WindowsBase" gefunden, die nicht aufgelöst werden konnten.
  Konflikt zwischen WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 und WindowsBase, Vers  ion=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35.
      WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 wurde aufgrund der primären Eigensc  haft WindowsBase, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 vorgezogen.
      Verweise, die von "WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" abhängig sind [  C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.11\ref\net8.0\WindowsBase.dll].
          C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.11\ref\net8.0\WindowsBase.dll
            Elementincludes einer Projektdatei, die den Verweis "C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref  \8.0.11\ref\net8.0\WindowsBase.dll" verursacht haben.
              C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.11\ref/net8.0/WindowsBase.dll
      Verweise, die von „WindowsBase, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35“ [] abhängen ode  r damit vereint wurden.
          C:\Users\Marcel\.nuget\packages\microsoft.web.webview2\1.0.2903.40\lib_manual\net5.0-windows10.0.17763.0\Micro  soft.Web.WebView2.Wpf.dll
            Elementincludes einer Projektdatei, die den Verweis "C:\Users\Marcel\.nuget\packages\microsoft.web.webview2\  1.0.2903.40\lib_manual\net5.0-windows10.0.17763.0\Microsoft.Web.WebView2.Wpf.dll" verursacht haben.
              C:\Users\Marcel\.nuget\packages\microsoft.web.webview2\1.0.2903.40\buildTransitive\..\\lib_manual\net5.0-w  indows10.0.17763.0\Microsoft.Web.WebView2.Wpf.dll

---

Environment:

• The .csproj TFM (target framework moniker) is set to "net8.0-windows"
• Installed dotnet version is 9.0.100 (output of dotnet --version)
• Used WebView2 package version is Latest (WebView2 1.0.2903.40)
• Used Visual Studio 2022 version is 17.12.2
• Used Windows Version is Windows 10 Pro 22H2 (Build 19045.5131)

---

Sorry for the non-english parts in the error message. I'm using a german Windows version.

I just thought i should post it. Maybe it helps the devs. Maybe it doesn't. But at least it also don't hurt. 😉

[zzmyers]

Same issue here.

Found conflicts between different versions of "WindowsBase" that could not be resolved. 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". "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. 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]. C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref\net9.0\WindowsBase.dll Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref\net9.0\WindowsBase.dll". C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref/net9.0/WindowsBase.dll References which depend on or have been unified to "WindowsBase, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" []. C:\Users\Doctor\.nuget\packages\microsoft.web.webview2\1.0.2903.40\lib_manual\net5.0-windows10.0.17763.0\Microsoft.Web.WebView2.Wpf.dll Project file item includes which caused reference "C:\Users\Doctor\.nuget\packages\microsoft.web.webview2\1.0.2903.40\lib_manual\net5.0-windows10.0.17763.0\Microsoft.Web.WebView2.Wpf.dll". C:\Users\Doctor\.nuget\packages\microsoft.web.webview2\1.0.2903.40\buildTransitive\..\\lib_manual\net5.0-windows10.0.17763.0\Microsoft.Web.WebView2.Wpf.dll

[ATECoder]

Same here:

Found conflicts between different versions of "WindowsBase" that could not be resolved.
There was a conflict between "WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" and "WindowsBase, Version=9.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35".
    "WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was chosen because it was primary and "WindowsBase, Version=9.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was not.
    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].
        C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref\net9.0\WindowsBase.dll
          Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref\net9.0\WindowsBase.dll".
            C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\9.0.0\ref/net9.0/WindowsBase.dll
    References which depend on or have been unified to "WindowsBase, Version=9.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" [].
        C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\WindowsFormsIntegration.dll
          Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\WindowsFormsIntegration.dll".
            C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref/net9.0/WindowsFormsIntegration.dll
        C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\PresentationCore.dll
          Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\PresentationCore.dll".
            C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref/net9.0/WindowsFormsIntegration.dll
        C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\PresentationFramework.dll
          Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\PresentationFramework.dll".
            C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref/net9.0/WindowsFormsIntegration.dll
        C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\ReachFramework.dll
          Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\ReachFramework.dll".
            C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref/net9.0/WindowsFormsIntegration.dll
        C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\System.Printing.dll
          Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\System.Printing.dll".
            C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref/net9.0/WindowsFormsIntegration.dll
        C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\UIAutomationProvider.dll
          Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref\net9.0\UIAutomationProvider.dll".
            C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.0\ref/net9.0/WindowsFormsIntegration.dll

Project info;

    <TargetFrameworks>net472;net48;net9.0-windows</TargetFrameworks>
    <NoWarn>NU1701;RAZORSDK1006</NoWarn>
    <OutputType>WinExe</OutputType>
    <UseWindowsForms>true</UseWindowsForms>

Visual Studio Info:

Microsoft Visual Studio Community 2022
Version 17.12.3
VisualStudio.17.Release/17.12.3+35527.113
Microsoft .NET Framework
Version 4.8.09032

Installed Version: Community

ASP.NET and Web Tools 17.12.178.10385
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C# Tools 4.12.0-3.24572.7+dfa7fc6bdea31a858a402168384192b633c811fa
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Code Converter 1.0
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Common Azure Tools 1.10
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Cookiecutter 17.0.24269.5
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Xamarin 17.12.0.153 (d17-12@1d0906d)
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SQLite: xamarin/sqlite@68c69d8
Xamarin.Android Tools: xamarin/xamarin-android-tools/d17-5@ca1552d

[praxmarer]

same issue here

[Aspage]

Same issue here! It works, but the message annoys me!