MsBuild cannot resolve MsBuildMajorVersion

user_1281652 0
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I have Visual Studio Solution with more than 100 projects. Five of them have Fody's nuget packages installed (version 6.0.3). When I try to build the Solution I get the following error:

Fody.6.3.0\build\Fody.targets(38,12): error MSB4086: A numeric comparison was attempted on "$(MsBuildMajorVersion)" that evaluates to "" instead of a number, in condition "($(MsBuildMajorVersion) < 16)"

After this failed build I try to build repeatedly and after several attempts (sometimes one, sometimes five) building finishes with success. I was trying to reinstall all nuget packages, clear nuget caches, reinstall Visual Studio, set MSBUILDDISABLENODEREUSE variable and nothing helped.

Visual Studio 2019 is in version 16.8.4 and all projects have .NET Framework in version 4.8.

UPDATE:

The problem exists on my machine only. On colleagues' workstations, everything works fine. I found the tip that after an unsuccessful build Visual Studio should be restarted and the build process is successful. This tip is a sufficient workaround for me.

fody visual-studio msbuild .net
6 Answers

The solution to the problem was to migrate from packages.config to PackageReference. You can do this in Visual Studio 2019: within Solution Explorer expand your project, than click right mouse button on the References and choose Migrate packages.config to PackageReference....

user_12816520

Try to install the latest Costura.Fody nuget package additionally on those five projects and also try to update Fody nuget package to the latest 6.3.0 version.

And then rebuild your project to check whether the issue happens.

user_124507470

I was able to fix this problem by adding to .csproj code to restore nugets (just copied from project created in VS 2017). Converting packages.config to PackageReference also worked for me but causes some other problems when build by msbuild.

Need to add following lines at the end of first PropertyGroup

  <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
  <RestorePackages>true</RestorePackages>
</PropertyGroup>

And following line EnsureNuGetPackageBuildImports target:

  <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">

See attached screenshot for more details:

enter image description here

user_11106640

I was able to fix this problem by cleaning up my whole resolution and trying to run a rebuild, then succeeded to rebuild the project.

Maybe you should try.

user_63759640

May sound silly, but for me all I needed to do, is simply upgrading Fody nuget to another version and switching back to the original version, and my code compiled successfully again. Might not be your case, but worth to try this 2 minutes solution.

user_51982830

I tried several of the solutions suggested here, but what finally worked was simply cleaning everything out, then performing the "Restore NuGet packages" from the solution context menu. Why this manual step worked when the auto-restore did restore the packages but caused the error, I'm not sure.

user_8640650
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