Warnings on <Sdk /> style import

[andrew-boyarshin]

MSBuild warnings:

C:\Users\<user>\.nuget\packages\msbuild.sdk.extras\1.6.41\Sdk\Sdk.props(11,3): warning MSB4011: "C:\Program Files\dotnet\sdk\2.1.400-preview-009063\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.props" cannot be imported again. It was already imported at "<project path>\project.csproj". This is most likely a build authoring error. This subsequent import will be ignored.
C:\Users\<user>\.nuget\packages\msbuild.sdk.extras\1.6.41\Sdk\Sdk.targets(15,3): warning MSB4011: "C:\Program Files\dotnet\sdk\2.1.400-preview-009063\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.targets" cannot be imported again. It was already imported at "<project path>\project.csproj". This is most likely a build authoring error. This subsequent import will be ignored.

Sample project:

<Project Sdk="Microsoft.NET.Sdk">
  <Sdk Name="MSBuild.Sdk.Extras" />
  <Sdk Name="Microsoft.Build.CentralPackageVersions" />
  <PropertyGroup>
    <TargetFramework>net472</TargetFramework>
    <ExtrasEnableWpfProjectSetup>true</ExtrasEnableWpfProjectSetup>
  </PropertyGroup>
</Project>

I believe some checks are needed in Sdk\Sdk.props and Sdk\Sdk.targets not to import Microsoft.NET.Sdk if already imported, since <Sdk /> imports are valid scenario too (I believe they are much more maintainable than <Project Sdk="" />).

[clairernovotny]

Hi,

The extras should be in place of the Microsoft.NET.Sdk in the Project element. It will include that in the correct locations.

[andrew-boyarshin]

@onovotny of course I know that. The issue is about support of almost identical method: <Sdk />. It presents almost the same import behavior while preserving Project SDK.

[clairernovotny]

That cannot work though due to ordering requirements. The extras needs things both before and after the main SDK targets to work. Thats why it does the import.

[andrew-boyarshin]

I see. Makes sense. Still, that's unfortunate limitation. Linking msbuild issue for reference. Feel free to close this if you believe this is not an issue then.