.Net Standard dependency for Nuget packages

Question

Current Situation

I'm having a .net core based project that target .net standard 2.0. In there I want to use the following Nuget package:

Microsoft.OneDriveSDK

Its dependencies are

Microsoft.OneDriveSDK
  Microsoft.Graph.Core
  Newtonsoft.Json

Looking into Nuget it seems that Newtonsoft.Json supports .net standard. Microsoft.Graph.Core does not list any target framework.

Actual Question

Why does Visual Studio show a warning regarding incompatibility as shown below? To me it looks like all packages do support .net standard.

Answer 1

This warning is the result of the .NET Framework 4.6.1 compatibility of .NET Core / .NET Standard 2.0.

The warning tells you that it is using assets built for .NET Framework. This allows many libraries to be used in .NET Core 2.0 but also a lot of libraries may not work and throw exceptions at runtime (missing types / members, PlatformNotSupportedException etc.)

See the "Reusing an existing .NET Framework library" part of the announcement blog post.