How to use the .NET Core Class Library in a .NET .NET application?

In particular, it doesn't work on ubuntu.

For example, if I do this:

dotnet new sln -n HelloWorld
dotnet new classlib -n HelloLib
dotnet new console -n HelloApp
dotnet sln add ./HelloApp/HelloApp.csproj
dotnet sln add ./HelloLib/HelloLib.csproj
dotnet restore
dotnet build

cd HelloApp/
dotnet add reference ../HelloLib/HelloLib.csproj

      

        
        
        
      

    

And change Program.cs like this:

using System;
using HelloLib;

namespace HelloApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var x = new Class1();
            Console.WriteLine("Hello World!");
        }
    }
}

      

        
        
        
      

    

The application will then compile creating these artifacts:

HelloApp/bin$ du -a
4   ./Debug/netcoreapp1.1/HelloApp.deps.json
4   ./Debug/netcoreapp1.1/HelloApp.runtimeconfig.json
4   ./Debug/netcoreapp1.1/HelloApp.pdb
4   ./Debug/netcoreapp1.1/HelloLib.pdb
8   ./Debug/netcoreapp1.1/HelloApp.dll
4   ./Debug/netcoreapp1.1/HelloApp.runtimeconfig.dev.json
4   ./Debug/netcoreapp1.1/HelloLib.dll
36  ./Debug/netcoreapp1.1
40  ./Debug
44  .

      

        
        
        
      

    

... but application execution fails:

$ dotnet HelloApp.dll 

Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly 'HelloLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.

Aborted (core dumped)

      

        
        
        
      

    

If I remove the line using HelloLib

, it works:

$ dotnet HelloApp.dll 
Hello World!

      

        
        
        
      

    

What's with that?

I am guessing it has something to do with confusing incompatibilities in the project files:

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

  <PropertyGroup>
    <TargetFramework>netstandard1.4</TargetFramework> <-- **THIS**
  </PropertyGroup>

</Project>

      

        
        
        
      

    

against

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp1.1</TargetFramework> <-- **And THIS**
  </PropertyGroup>
  <ItemGroup>
    <ProjectReference Include="..\HelloLib\HelloLib.csproj">
      <Project>{1607a379-5bae-423b-8efc-796a06556be0}</Project>
      <Name>HelloLib</Name>
    </ProjectReference>
  </ItemGroup>
</Project>

      

        
        
        
      

    

I assumed this was just a bug.

... but other people seem to be using the .NET core without too much trouble.

So, am I doing something wrong?

Or are people using ".NET core" just not using class libraries because they don't work?

(edit: versions:

Microsoft .NET Core Shared Framework Host

  Version  : 1.1.0
  Build    : 928f77c4bc3f49d892459992fb6e1d5542cb5e86

$ dpkg -l |grep dotnet
ii  dotnet-dev-1.0.3                                                 1.0.3-1                                      amd64        .NET Core SDK 1.0.3

$ cat /etc/issue
Ubuntu 16.10 \n \l