Add .dll reference to nuget that is generated before build - msbuild

Question

I'm deploying a MsBuild task using nuget, that generates a .dll before each build.
I fail to get the generated dll referenced in the References node in the Visual Studio project of consumers.
I'm also using MSBuild to build the .nupkg file. Generating and compiling works just fine, I deploy the following target in the build/directory
<Project>
<!-- this will automatically run before the 'Build' target -->
<Target Name="GenerateAndBuild" BeforeTargets="Build">
<!--the deployed task that generates the code-->
<Utils.CreateUtilResourceTask/>
<ItemGroup>
<CompileGeneratedSources Include="GeneratedClass.cs" />
</ItemGroup>
<MakeDir Directories="$(OutputPath)" Condition="!Exists('$(OutputPath)')" />
<Csc Sources="#(CompileGeneratedSources )" OutputAssembly="$(OutputPath)Util.dll" TargetType="library" EmitDebugInformation="true" />
<Delete Files="#(CompileGeneratedSources )" />
</Target>
</Project>
That generates the util.dll in the project output folder but I fail to get it referenced in the consuming project.
I thought that this would work in the .csproj file:
<PropertyGroup>
<TargetFrameworks>netstandard1.6;net46</TargetFrameworks>
<BuildOutputTargetFolder>tasks</BuildOutputTargetFolder>
<VersionPrefix>0.1.1</VersionPrefix>
<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
<PackageOutputPath>$(MSBuildThisFileDirectory)</PackageOutputPath>
<PackageId>BuildUtil</PackageId>
<!-- that does not add a refenrece in consuming projects -->
<references>
<reference file="$(OutputPath)Util.dll"/>
</references>
<files>
<file src="$(OutputPath)Util.dll"/>
</files>
</PropertyGroup>
Perhaps someone has a hint on that?

Answer 1

You need to declare the assembly reference in an ItemGroup, not a PropertyGroup. For example:
<ItemGroup>
<Reference Include="$(OutputPath)Util.dll" />
</ItemGroup>