Aspnetcore: Sharing DI Container in WebHost

[devbrsa]

ASP.NET Core 2.1 now supports Generic Host, and is there a way to share DI container registered in IWebHostBuilder among GenericHosts/HostBuilders?

[Tratcher]

Even if you could there are some core services that would break. E.g. IApplicationLifetime is assumed to be a singleton per host.

[davidfowl]

No you cannot. Why are you using both in the same process?

[devbrsa]

I have an API running under WebHost and a stream process running under GenericHost. The problem is when in my service orchestrator persists to a database under DI of WebHost and after that, I send a message to the streamer under GenericHost. Looks like (and really is) my IHost tries to resolve the service dependencies there were already resolved by WebHost. I don't want to duplicate my dependencies.
Actually, I'm thinking to migrate everything to GenericHost (even my web api), so all components will be under the same container.
Any suggestions?

[Tratcher]

We don't plan to get eveything migrated to GenericHost until at least 3.0, though here's an initial sample of that may look like: https://github.com/aspnet/Hosting/blob/8d55a447d480bb826cf0088718bbea200b2537bb/samples/GenericWebHost/Program.cs

[davidfowl]

If you're in the same process you should just do everything in the web host. What @Tratcher brought up is what we plan to investigate in 3.0

[devbrsa]

@davidfowl you mean, run everything under GenericHost or WebHost?

[davidfowl]

WebHost

[devbrsa]

@Tratcher is the example just a concept, or should create a response when running?

[Tratcher]

It doesn't hook up a real server due to some circular dependency issues, but you should be able to add Kestrel for some one-off testing. See https://github.com/aspnet/KestrelHttpServer/issues/2498