NU1202 Package Microsoft.EntityFrameworkCore 6.0.3 is not compatible with netstandard2.1

Question

I am trying to install the latest Microsoft.EntityFrameworkCore 6.0.3 into a class library project targetting netstandard2.1 using Nuget Package Manager and I get this error:

Package Microsoft.EntityFrameworkCore 6.0.3 is not compatible with netstandard2.1 (.NETStandard,Version=v2.1). Package Microsoft.EntityFrameworkCore 6.0.3 supports: net6.0 (.NETCoreApp,Version=v6.0)

Can anyone help me with their guidance to fix this issue?

Answer 1

In my case, I had a project targetting both .NET Standard 2.0 and .NET Core:

<TargetFrameworks>netstandard2.0;net6.0</TargetFrameworks>

So they solution was to apply a condition to use the older version of the Microsoft.EntityFrameworkCore package for .NET Standard 2.0, and the newer one for .NET 6:

<ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.17" />
</ItemGroup>

<ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.29" />
</ItemGroup>

Answer 2

To add to Santosh's Answer.

Back in 2020 MSFT put out a statement that they were moving away from .Net Standard.

Essentially:

• Use netstandard2.0 to share code between .NET Framework and all other platforms.

• Use netstandard2.1 to share code between Mono, Xamarin, and .NET Core 3.x.

• Use net5.0 for code sharing moving forward.

So with the above, transitioning class libraries to .NET 6 makes sense.

More:

https://devblogs.microsoft.com/dotnet/the-future-of-net-standard/

Answer 3

After upgrading the classlibrary from .NETStandard 2.1 to net6.0 and then adding the nuget packages related to EntityFramework 6.0.3 worked for me.