msbuild PackageReference.PrivateAssets = All does not seem to work

问题

I have a test project which reference NUnit3TestAdapter. I do not this reference to be copied over to the projects that depend on this one.

I thought setting PrivateAssets = All would do it, but apparently I misunderstand how it works, because it does not have the desired effect.

Here is the code:

Rollup\Rollup.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net472</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <ProjectReference Include="..\UITests\UITests.csproj"/>
  </ItemGroup>

</Project>

UITests\UITests.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net472</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="NUnit3TestAdapter" Version="3.11.2">
      <PrivateAssets>All</PrivateAssets>
    </PackageReference>
  </ItemGroup>

</Project>

Directory.Build.rsp

.\Rollup.sln /restore /v:m

After I run msbuild all is built, but I can see NUnit3TestAdapter is in the bin folder for Rollup.

What am I missing?

(https://github.com/Microsoft/msbuild/issues/3996)

回答1:

PrivateAssets works as expected but the NUnit test adapter NuGet package adds an MSBuild target to the build that adds a few dll files as content items to the project, which then flow transitively through the build - this has the same effect as if you added a text file and set its "Copy to Output Directory" property.

The NUnit3TestAdapter.props contains definitions like:

<Content Include="$(MSBuildThisFileDirectory)NUnit3.TestAdapter.dll">
  <Link>NUnit3.TestAdapter.dll</Link>
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
  <Visible>False</Visible>
</Content>

You should see these files if you click the "Show All Files" in the Visual Studio solution explorer.

Note that test projects aren't really supposed to be packaged or referenced. They should be leaf projects. The test project templates even contain an <IsPackable>false</…> definition and XUnit's core package also adds it as an imported MSBuild file. The test frameworks expect you to use their abstraction libraries and not runtime assemblies / test adapter packages for projects that share tests or test logic.

来源：https://stackoverflow.com/questions/53687694/msbuild-packagereference-privateassets-all-does-not-seem-to-work

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