New doc Hosting: IServiceProviderFactory

[Rick-Anderson]

For hosting content.

References:

• Proposal: Add IServiceProviderFactory aspnet/DependencyInjection#442
• Add support for IServiceProviderFactory aspnet/DependencyInjection#443
• Proposal: Support IServiceProviderFactory aspnet/Hosting#829
• https://github.com/davidfowl/ServiceProviderFactorySample

[guardrex]

For hosting content.

References:

• Proposal: Add IServiceProviderFactory aspnet/DependencyInjection#442
• Add support for IServiceProviderFactory aspnet/DependencyInjection#443
• Proposal: Support IServiceProviderFactory aspnet/Hosting#829
• https://github.com/davidfowl/ServiceProviderFactorySample

[Rick-Anderson]

@guardrex can we close this? If no, what's the plan?

[guardrex]

We used to have https://docs.microsoft.com/en-us/aspnet/core/fundamentals/host/generic-host?view=aspnetcore-2.2#container-configuration ... I think 🤔 it was dropped because one of the goals for the 3.0 update was ...

Avoid advanced scenarios in a Fundamentals article.

Moving it would have been better than dropping it. If it isn't here and it isn't in the DI topic (for the same reason), where does that go? ... a short topic in the Advanced node? ... maybe so.

Also, idk if this issue was created because PU requested an advanced, detailed topic on the subject, not just a quick-'n-dirty bit like the old Container configuration section. I hope we can take the easy path and resurrect that section for coverage, either here or in a new short topic using that content.