NuGet: references to assemblies in runtimes folder not added

Question

I have a project that targets two different operating systems/frameworks:

1. net461 on Windows and
2. netcoreapp2.0 on OSX
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Answer 1

I'm trying to solve the same problem. The solution proposed by you works fine, but there is one question ... The case of Win and net46 is clear. And now I need to add a reference to the assembly in the project for a netcoreapp for the Win and for Linux. The problem is that this is a DIFFERENT assembly with the SAME name. Those my package looks like this:

/lib/net461/myassembly1.dll                       (net461/Windows Compile and Runtime)
/runtimes/ubuntu/lib/netcoreapp2.0/myassembly2.dll   (netcore/Ubuntu Runtime)
/runtimes/win/lib/netcoreapp2.0/myassembly1.dll   (netcore/Win Runtime)
/ref/netcoreapp2.0/???

Update: Actually, the myassembly1.dll and myassembly2.dll are both called myassembly.dll. But to show that one is assembled for Windows, and the second one for Linux, I will leave here such a name.

The most interesting thing is that I tried to put any assembly in the folder ref, and it works on both Windows and Linux. This version works on both systems

/lib/net461/myassembly1.dll   
/runtimes/ubuntu/lib/netcoreapp2.0/myassembly2.dll 
/runtimes/win/lib/netcoreapp2.0/myassembly1.dll  
/ref/netcoreapp2.0/myassembly1.dll

And this too

/lib/net461/myassembly1.dll   
/runtimes/ubuntu/lib/netcoreapp2.0/myassembly2.dll 
/runtimes/win/lib/netcoreapp2.0/myassembly1.dll  
/ref/netcoreapp2.0/myassembly2.dll

But I think this is not right and I was wrong somewhere.