问题
According to the docs on the .NET Platform Standard, it seems like it should be possible for Xamarin apps to consume NuGet packages targetin netstandard13. However, when I try this I get the following error while trying to add the NuGet:
Unable to find a version of 'System.Collections.Concurrent' that is compatible with 'npgsql 3.9.0 constraint: System.Collections.Concurrent (>= 4.0.12-rc2-24027)'.
I'm trying to do this on VS2015 update 2 + RC2 tooling. Is this not possible, is there another way to approach this?
回答1:
That npgsql package seems to be depending on pre-release packages (RC - Release Candidate). Run the install with -pre option:
Install-Package npgsql -pre
来源：https://stackoverflow.com/questions/37393982/xamarin-android-dependency-netstandard13-package