DbContextActivator missing in net core 3?

[ronsson]

Hello,

I can't find the DbContextActivator class after upgrading to net core 3.1. I was using it and was wondering if it has been removed?

[bricelam]

We made it a little harder to reference the EFCore.Design assembly where it lives. See Microsoft.EntityFrameworkCore.Design is now a DevelopmentDependency package.

Out of curiosity, how what are you using it for?

[ronsson]

Thanks for the explanation. Well, I am breaking the DI pattern and recreate DB Contexts at certain intervals or after x transactions instead, performing operations in a BackgroundService per database. I still believe that must be a lot better where I have hundreds or thousands of operations per second also it is only created in that class.

This is a game server running in IIS so I get a lot of database input via web socket communication.

I don't use Controllers for realtime data management that much and can't DI all my various classes since the classes remain alive until the application dies. I tried retrieving the context from services but it becomes disposed.

But yeah if you have a silver bullet for DI with persistent classes or retrieving contexts from IWebHost.Services and I am totally wrong about my assumption I'd be happy to learn :D

public class DbThreadUpdater<T, C> : BackgroundService where C : DbContext

[AndriySvyryd]

@ronsson Check out DbContextFactory added in #21246 and available in 5.0.0-preview7

[ronsson]

Thanks!