Compilation fails with NETSDK1130 error, WITHOUT directly referencing a winmd

Hi,

I’m running into problems with NETSDK1130. Basically I can’t compile 84 of the 100 projects in my solution because of this error. The message seems very clear: Referencing a Windows Metadata component directly when targeting .NETCoreApp,Version=v5.0 is not supported. Use the C#/WinRT projection tool (https://aka.ms/cswinrt) or a provided projection for this target. But that is exactly what I’m doing. I don’t have direct references to winmd files.

So, I created a small test solution comprising of 1 class library and 1 console app. These are the project files:

ClassLibrary

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

  <PropertyGroup>
    <TargetFramework>net5.0-windows</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Toolkit.Uwp.Notifications" Version="6.1.1" />
    <PackageReference Include="Microsoft.Windows.CsWinRT" Version="1.0.1" />
  </ItemGroup>

</Project>

Console app

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0-windows</TargetFramework>
  </PropertyGroup>

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

</Project>

Both the class library and the console app contain only the newly scaffolded files (so, without any code).

Now when I try building the solution I get this output:

1>------ Rebuild All started: Project: ClassLibrary, Configuration: Debug Any CPU ------
2>------ Rebuild All started: Project: TestWinmd, Configuration: Debug Any CPU ------
2>C:\Program Files\dotnet\sdk\5.0.100-rc.2.20479.15\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(934,5):
    error NETSDK1130: Referencing a Windows Metadata component directly when targeting .NETCoreApp,Version=v5.0 is not supported.
    Use the C#/WinRT projection tool (https://aka.ms/cswinrt) or a provided projection for this target.
2>Done building project "TestWinmd.csproj" -- FAILED.
========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ==========

As you can see the ClassLibrary compiles fine and the console app fails.

My conclusion: there are no direct references to Windows Metadata components, therefore the NETSDK1130 error is misplaced.

As far as I can tell this problem started after upgrading nuget packages from .Net 5 RC1 to .Net 5 RC2. The copy of my dev-environment running the .Net 5 RC1 packages, compiles the entire solution just fine.

I’m using .Net 5.0 RC2, and Visual Studio Professional 2019 Version 16.8.0 Preview 5.0

I hope you can point out what I’m doing wrong here, because I have no clue on how to fix this, other that staying on .NET5 RC1.

Thanks, Richard

[ClosetBugSlayer]

I’m having the same exact problem as OP. I regret ever attempting to port my project to .NET 5. I’m going to lose weeks too aren’t I. ($$$) I have to warn the others.

[marcpopMSFT]

@dsplaisted to respond in email on the discussion we’re having on this.