Running a PreBuild target only once if multitarget

[AlexanderRydberg]

Heya!
Im all out of ideas. I need some help. Short story: I want to run a .exe from a nuget-package only once, before build, in a multitarget project. This is how I would usually do this for the projects that are not multitarget:

<Target Name="PreBuild" BeforeTargets="PreBuildEvent">
    <Exec WorkingDirectory="$(MSBuildProjectDirectory)\Localization" Command="&quot;$(PkgMyNuget)\tools\MyNuget\MyNuget.exe&quot; /public /ns:MyNameSpace" />
  </Target>

This is my test setup where I only do Message for debugging purposes:

<PropertyGroup>
  <TargetFrameworks>net48;net6.0</TargetFrameworks>
</PropertyGroup>

<ItemGroup>
  <PackageReference Include="MyNuget" version="1.0.0"> 
    <PrivateAssets>all</PrivateAssets>
    <IncludeAssets>none</IncludeAssets>
  </PackageReference>
</ItemGroup>

This works except it is running for each of the target frameworks:

<Target Name="PreBuild" BeforeTargets="PreBuildEvent">
  <Message Text="PkgMyNuget: $(PkgMyNuget)" Importance="high" />
</Target>

Result:

PkgMyNuget: D:\Nuget\MyNuget\1.0.0
PkgMyNuget: D:\Nuget\MyNuget\1.0.0

For it to run only once i can do this:

<Target Name="OuterPreBuild" BeforeTargets="DispatchToInnerBuilds">
  <Message Text="PkgMyNuget: $(PkgMyNuget)" Importance="high" />
</Target>

Result: PkgMyNuget:

From what I understand, if Im running beforeTargets DispatchToInnerBuilds, then its running to early. So, here I am, asking for some help on how to solve this. Any suggestions?

Edit: I think I have found a workaround. But I would still like to see if theres any other approach to this problem since the package might not have been restored yet.

  <PropertyGroup>
    <MyNugetVersion>1.0.0</MyNugetVersion>
    <PkgMyNuget>$(NuGetPackageRoot)\MyNuget\$(MyNugetVersion)</PkgMyNuget>
  </PropertyGroup>

<ItemGroup>
  <PackageReference Include="MyNuget" version="$(MyNugetVersion)"> 
    <PrivateAssets>all</PrivateAssets>
    <IncludeAssets>none</IncludeAssets>
  </PackageReference>
</ItemGroup>

<Target Name="PreBuild" BeforeTargets="PreBuildEvent">
    <Exec WorkingDirectory="$(MSBuildProjectDirectory)\Localization" Command="&quot;$(PkgMyNuget)\tools\MyNuget\MyNuget.exe&quot; /public /ns:MyNameSpace" />
  </Target>

What I did not mention is that we are using CPM. The first property group I can have in Directory.Packages.props (and ofc skip the version in the csproj and have $(MyNugetVersion) on the version in .props)