Efcore.pg: .NET Core 3.0 Preview 6 incompatibility

[SonicGD]

Hello. When i try to run my app on .NET Core 3.0 Preview 6 it fails with error:

Unhandled Exception: System.TypeLoadException: Could not load type 'Microsoft.EntityFrameworkCore.Query.ExpressionTranslators.IMemberTranslator' from assembly 'Microsoft.EntityFrameworkCore.Relational
, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
   at Microsoft.Extensions.DependencyInjection.NpgsqlEntityFrameworkServicesBuilderExtensions.AddEntityFrameworkNpgsql(IServiceCollection serviceCollection)

As i understand, problem is here - https://github.com/npgsql/Npgsql.EntityFrameworkCore.PostgreSQL/blob/d86bd4eff553d9a65713d8a1d2e84a41791f5a8b/src/EFCore.PG/Extensions/NpgsqlServiceCollectionExtensions.cs#L96

and caused by https://github.com/aspnet/EntityFrameworkCore/pull/14455

[roji]

You will have to wait until a preview6 of the Npgsql provider is released. This is expected to take a while, as the upstream changes are quite significant - we may end up syncing only for preview7.

[SeppPenner]

Hi @roji. Do you already have a slight idea when this will be available?

[roji]

Probably only for preview7, which is not too far away. Once that's out, I'll try to do a big push and release the corresponding Npgsql provider. Sorry it's not immediately available as usual - preview6 actually includes some pretty big changes that introduce considerable breakage on the provider side.

[SeppPenner]

@roji Is this already available in the preview8 version? (Right now I'm using SQL server but I want to switch back to PostgreSQL again as soon as possible...)

[SonicGD]

Yes, it is. Preview8 and preview9 (released today) works great.

[SeppPenner]

Yes, it is. Preview8 and preview9 (released today) works great.

Thanks, I will try it. I have seen the Visual Studio update and the NetCore update already 👍

[SeppPenner]

Yep, works for me as well. Thanks for the updates to all.