[macOS] macOS build doesn't support Entity Framework

[bstrother1]

Current behavior

MacOS build is stuck on Net Framework 2 which is so old that Entity Framework does not support it even at its earliest NuGet stable build https://www.nuget.org/packages/EntityFramework/4.2.0 which requires minimum Net Framework 4.0 nor does Net Framework Core which earliest build requires minimum 4.5.1.

Expected behavior

Expected macOS build to support Entity Framework usage like UWP and WPF builds do.

How to reproduce it (as minimally and precisely as possible)

Follow https://docs.microsoft.com/en-us/ef/core/get-started/overview/first-app?tabs=netcore-cli

MyApp01.zip

Workaround

None

Works on UWP/WinUI

Yes

Environment

No response

NuGet package version(s)

PackageReference Include="Uno.UI" Version="4.0.13"
PackageReference Include="Uno.UI.RemoteControl" Version="4.0.13" Condition="'$(Configuration)'=='Debug'"
PackageReference Include="Uno.UI.Adapter.Microsoft.Extensions.Logging" Version="4.0.13"
PackageReference Include="Microsoft.Extensions.Logging" Version="5.0.0"
PackageReference Include="Microsoft.Extensions.Logging.Console" Version="5.0.0"
PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="6.0.0"
PackageReference Include="Microsoft.Data.Sqlite.Core" Version="5.0.14"
PackageReference Include="Microsoft.EntityFrameworkCore" Version="5.0.14"
PackageReference Include="Microsoft.EntityFrameworkCore.Analyzers" Version="5.0.14"
PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.14"
PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="5.0.14"
PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="5.0.14"
PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="5.0.14"
PackageReference Include="System.Data.SQLite.Core"

Affected platforms

macOS

IDE

Visual Studio 2019

IDE version

8.10

Relevant plugins

No response

Anything else we need to know?

No response

[jeromelaban]

Thanks for the question. Xamarin.mac is indeed supporting netstandard2.1 as a maximum.

If you want to run packages above this version, you'll need to go with the net6.0-mac projects from net6 and use Entity Framework Core. These net6 targets are still in preview at this point, because .NET is currently still in preview (Preview 13, currently).

[MartinZikmund]

I have been able to reference netstandard2.1 class library from macOS project without issues locally, so the repro would help

[bstrother1]

MyApp01.zip

I believe the attached example demonstrates what I mean. If I go into the .csproj in the mac head of this project and edit the target to netstandard2.1 it just errors out the project. No, I haven't attempted Rider.

[bstrother1]

I have been able to reference netstandard2.1 class library from macOS project without issues locally, so the repro would help

Could you attach a sample project of you doing this so I can see if it is my local build failing?

[bstrother1]

Just to update this discussion https://docs.microsoft.com/en-us/visualstudio/releasenotes/vs2019-mac-relnotes under Visual Studio 2019 for Mac version 8.10.15 (8.10.15.32), Old .NET x64 SDKs are not supported on Arm64 and must be removed before installing the latest supported versions. So the old template (non-net6) cannot be upgraded to netstandard2.0 and is essentially stranded on xamarin 2.0. I hope this saves someone else time.

[ajpinedam]

Thanks @bstrother1 for bringing this up!