BuildPackage

App.csproj

<Target Name="AfterBuild" DependsOnTargets="BuildPackage" />
<Target Name="BuildPackage" DependsOnTargets="BuildPackageCore" Outputs="$(Packages)" Condition=" '$(BuildPackage)' == 'True' " />
<Target Name="BuildPackageCore">
  <PropertyGroup>
    <!-- Escape the OutDir's trailing slash -->
    <_PackagesOutDir Condition="HasTrailingSlash('$(OutDir)')">"$(OutDir)\"</_PackagesOutDir>
    <_PackagesOutDir Condition="!HasTrailingSlash('$(OutDir)')">"$(OutDir)\\"</_PackagesOutDir>
  </PropertyGroup>
  <Exec ContinueOnError="ErrorAndContinue" ConsoleToMSBuild="True" Command="&quot;$(SolutionDir)tools\nuget.exe&quot; pack &quot;$(MSBuildThisFileFullPath)&quot; -Symbols -IncludeReferencedProjects -OutputDirectory $(_PackagesOutDir) -Properties Configuration=$(Configuration)">
    <Output TaskParameter="ConsoleOutput" ItemName="_out" />
  </Exec>
  <PropertyGroup>
    <_Pattern><![CDATA[Successfully created package '(?<package>.+)'.]]></_Pattern>
  </PropertyGroup>
  <ItemGroup>
    <_Matches Include="$([System.Text.RegularExpressions.Regex]::Match('%(_out.Identity)', '$(_Pattern)').Groups['package'].Value)" Condition="$([System.Text.RegularExpressions.Regex]::IsMatch('%(_out.Identity)', '$(_Pattern)'))" />
  </ItemGroup>
  <PropertyGroup>
    <Packages>@(_Matches->'%(FullPath)')</Packages>
  </PropertyGroup>
  <WriteLinesToFile Lines="$(Packages)" File="$(IntermediateOutputPath)$(CleanFile)" />
</Target>