CNTK NuGet package doesn't work with new-style csproj format

[alexpolozov]

Repro steps: try to create basically a Hello World project using CNTK C# evaluation API:

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
  </PropertyGroup>

  <ItemGroup Condition="'$(TargetFramework)' == 'net461'">
    <PackageReference Include="CNTK.CPUOnly" Version="2.1.0" />
  </ItemGroup>

</Project>

using System;
#if NET461
using CNTK;
#endif

namespace TestCntk {
    class Program {
        static void Main(string[] args) {
            Console.WriteLine("Hello World!");
        }
    }
}

It doesn't even link to the right library, even though VS displays the NuGet package as a (conditional) dependency and it's definitely restored locally to the machine.

1>Program.cs(3,7,3,11): error CS0246: The type or namespace name 'CNTK' could not be found (are you missing a using directive or an assembly reference?)

[robinhad]

The same here for .netcoreapp 2.0

[yiylin]

when will this be fixed?

[davidbrownellWork]

Support for .NET Core 2.0 has been checked into the master branch and will be a part of the next official release.

[lostmsu]

@davidbrownellMS still not in 2.6.0 RCs

[davidbrownellWork]

This issue is being tracked by #2352.