Update Directory.Build.props

Author: IVNSTN

Directory.Build.props

@@ -93,7 +93,17 @@
   <!-- Packing options -->
   <PropertyGroup>
     <ContentTargetFolders>content</ContentTargetFolders>
-  </PropertyGroup>
+  </PropertyGroup><Project>
+
+  <!-- Manual fix for publishing targeting multiple frameworks
+  <Target Name="PublishProjectIfFrameworkSet" DependsOnTargets="Publish" Condition=" '$(TargetFramework)' != '' " />
+  <Target Name="PublishProjectForAllFrameworksIfFrameworkUnset" Condition=" '$(TargetFramework)' == '' ">
+    <ItemGroup>
+      <_PublishFramework Include="$(TargetFrameworks)" />
+    </ItemGroup>
+    <MSBuild Projects="$(MSBuildProjectFile)" Targets="Publish" Properties="TargetFramework=%(_PublishFramework.Identity)" />
+  </Target>
+  <Target Name="PublishAll" DependsOnTargets="PublishProjectIfFrameworkSet;PublishProjectForAllFrameworksIfFrameworkUnset" />
 
   <ItemGroup>
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118">