VS 2017 RC : I Can not update NETStandard.Library in Nuget

问题

From the last (or maybe the two last) update, I can't update the package NETStandartLibrary in Nuget. I just create a new standard library project. See this message :

In project's properties, the version is different :

And in the .csproj :

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

   <PropertyGroup>
       <TargetFramework>netstandard1.4</TargetFramework>
   </PropertyGroup>

</Project>

In Nuget, I add the dependency 'Microsoft.EntityFrameworkCore', then I got the warning :

Warning Detected package downgrade: NETStandard.Library from 1.6.1 to 1.6.0 AgainTest (>= 1.0.0) -> Microsoft.EntityFrameworkCore (>= 1.1.0) -> NETStandard.Library (>= 1.6.1) AgainTest (>= 1.0.0) -> NETStandard.Library (>= 1.6.0)

I select the high version in the project's property, but the warning continue.

• What are all this version numbers?
• How can I resolve this warning?

回答1:

You can't change this from the GUI because this package is impliclity defined from your TargetFramework. To change the version of NETStandard.Library package, add the following to your csproj file.

<PropertyGroup>
  <NetStandardImplicitPackageVersion>1.6.1</NetStandardImplicitPackageVersion>
</PropertyGroup>

回答2:

Adding the following to your csproj also seems to work:

<ItemGroup>
    <PackageReference Update="NETStandard.Library" Version="1.6.1" />
</ItemGroup>

来源：https://stackoverflow.com/questions/42320021/vs-2017-rc-i-can-not-update-netstandard-library-in-nuget