Nancy: Cannot build .NET Standard lib referencing Nancy 2.0.0

Created on 8 Dec 2016  ·  5Comments  ·  Source: NancyFx/Nancy

I am using Visual Studio 2015 Update 3 and have a *.csproj portable class library set to target .NETStandard1.x.

In order to be able to reference Nancy 2.0.0-barneyrubble nuget package, I need to upgrade the portable class library to .NETStandard1.6. However, doing so renders the project unbuildable.

Any attempt to build it in Visual Studio or using msbuild report this error:

Your project is not referencing the ".NETPlatform,Version=v5.0" framework. Add a reference to ".NETPlatform,Version=v5.0" in the "frameworks" section of your project.json, and then re-run NuGet restore.

Here is the project.json file:

{
  "supports": {},
  "dependencies": {
    "Microsoft.AspNetCore.Owin": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.NETCore.Portable.Compatibility": "1.0.1",
    "Nancy": "2.0.0-Pre0",
    "NETStandard.Library": "1.6.1"
  },
  "frameworks": {
    "netstandard1.6": {}
  }
}

Building the project with dotnet restore and dotnet build from the command line works, though.

I know this issue is not specific to Nancy. Yet I'd love to know if somebody found a workaround for this problem. Or if it might be possible to use a lower .NET Standard version when building Nancy itself?

Most helpful comment

I wrote a blog post on the topic, just in case.

All 5 comments

I don't think just using Visual Studio 2015 Update 3 is enough. The dotnet/web tooling for Visual Studio ships out of band, so you need to go get the latest version of that here.

@khellang I had already installed the .NET Core tooling (both command line and Visual Studio 2015 integration). And I can happily build .NET Standard 1.3 class libraries. It is just that I need 1.6 to be able to reference Nancy. And that won't build.

Hmm. Have you looked at this?

Thank you - indeed, adding this to the end of the *.csproj file did the trick:

<PropertyGroup>
  <NuGetTargetMoniker>.NETStandard,Version=v1.6</NuGetTargetMoniker>
</PropertyGroup>

I wrote a blog post on the topic, just in case.

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