将 .NetStandard 2.0 Nuget 包安装到 VS2015 Net 4.6.1 项目中

Question

I'm trying to install a Nuget package that targets .NetStandard 2.0 (Microsoft.Extensions.Logging.Abstractions) into a Net 4.6.1 project in Visual Studio 2015. However, while Frameworks should be compatible, it doesn't quite work:

Install-Package : Could not install package 'Microsoft.Extensions.Logging.Abstractions 2.0.0'. You are trying to 
install this package into a project that targets '.NETFramework,Version=v4.6.1', but the package does not contain 
any assembly references or content files that are compatible with that framework. For more information, contact 
the package author.
At line:1 char:1
+ Install-Package Microsoft.Extensions.Logging.Abstractions

I've followed the steps outlined here: Entity Framework Core 2.0 on .NET 4.6.1

So I have installed package "NETStandard.Library.NETFramework", and added

<PropertyGroup>
  <PackageTargetFallback>netstandard2.0</PackageTargetFallback>
</PropertyGroup>

to the csproj. But, no luck there - still the same issue.

Is there any way to install a NetStandard 2.0 package into my project (without upgrading VS or installing any Net Core targeting packs or such)?

Thanks

Answer 1

Is there any way to install a NetStandard 2.0 package into my project (without upgrading VS or installing any Net Core targeting packs or such)?

I am afraid not. Just like Jon pointed out that the reason for that issue is that you are using Visual Studio 2015.

According to the .NET Standard , .NET Standard 2.0 support .NET Framework 4.6.1 (with .NET Core 2.0 SDK ):

So we need install .NET Core 2.0 SDK. And every communication from Microsoft about the preview of .NET Core 2.0 mentions Visual Studio 2017 , so I think it's highly recommanded to use Visual Studio 2017 to work with .NET Core 2.0.

Besides, the NuGet package NETStandard.Library.NETFramework is deprecated .

So install a .NetStandard 2.0 Nuget package into a Net 4.6.1 project, I highly recommanded to use Visual Studio 2017 to work with .NET Core 2.0.

Hope this helps.

Answer 2

Referencing .NET Standard 2.0 packages is supported using the following:

• NuGet 3.6.0 or higher for VS 2015 (from NuGet's download site - may not yet be listed as recommended latest)
• Install the ".NET Standard Support for Visual Studio 2015" from https://aka.ms/netstandard-build-support-netfx (NuGet in VS will also print a link to this in its output window).

There are a still few bugs when consuming .NET Standard 2.0 libraries, especially when mixing .NET Standard < 2.0 and 2.0 libraries but these updates give basic support.