Latest System.Reactive 4.2.0 is not directly supported in LINQPad 6.3.0

sdflysha

Seems latest System.Reactive 4.2.0 has changed it's nuget layout:

C:\Users\flysha.zhou\.nuget\packages\system.reactive\4.2.0>tree /f
卷 Windows 的文件夹 PATH 列表
卷序列号为 2657-E1FC
C:.
│  .nupkg.metadata
│  .signature.p7s
│  system.reactive.4.2.0.nupkg
│  system.reactive.4.2.0.nupkg.sha512
│  system.reactive.nuspec
│
├─build
│  └─netcoreapp3.0
│          System.Reactive.dll
│          System.Reactive.targets
│          System.Reactive.xml
│
├─buildTransitive
│  └─netcoreapp3.0
│          System.Reactive.targets
│
└─lib
    ├─net46
    │      System.Reactive.dll
    │      System.Reactive.xml
    │
    ├─netcoreapp3.0
    │      _._
    │
    ├─netstandard2.0
    │      System.Reactive.dll
    │      System.Reactive.xml
    │
    ├─uap10.0
    │      System.Reactive.dll
    │      System.Reactive.pri
    │      System.Reactive.xml
    │
    └─uap10.0.16299
            System.Reactive.dll
            System.Reactive.pri
            System.Reactive.xml

Note: lib/netcoreapp3.0 has NOTHING. (Maybe they moved it to build\netcoreapp3.0😂) So that LINQPad 6 randomly select "net46", which popup a warning when install "System.Reactive":


Everything works perfectly fine in Visual Studio 2019:

JoeAlbahari

You're right in that LINQPad shouldn't pick the net46 framework; it should ignore the package altogether when a compatible framework folder is present with a file called _._

In terms of a proper fix, I don't know what to do other than special-case System.Reactive. They've designed it now so that it can only with MSBuild.