DI Child Containers - people might find this useful

[dazinator]

Its possible to create child containers purely using the native / built in microsoft ServiceProvider.
For anyone that is interested in this take a look at:

https://github.com/dazinator/Dazinator.Extensions.DependencyInjection/blob/develop/src/DependencyInjection.ChildContainers/README.md

The nuget package: https://www.nuget.org/packages/Dazinator.Extensions.DependencyInjection.ChildContainers/

I thought it would be good to register this as a discussion here, in case anyone searches for "child container" functionality and only comes accross advice stating you should swap out the native container to one that supports child containers

This is obviously accurate and sensible advice given no alternatives. However here I am just presenting an alternative. If the you generally happy with the native ServiceProvider and how it works, and just want "Child Container" feature, then it's no longer necessary to spend time evaluating and switching to a third party DI container implementation. You can "stick with the devil you know".

In my view, a child container is just another instance of a container, with very slightly amended logic about which service registrations are honoured. To reflect this, the library provides a means to configure child service collections (a specialized implementation of IServiceCollection that also allows the immutable parents servide descriptors to be evaluated), and then configure any third party container (that doesn't support "child container" feature inherently) as a child container - as long as it supports being built from IEnumerable<ServiceDescriptor>.

I'm putting this out there in case its useful, feedback welcome.
Feel free to close this discussion if you are cleaning up issues.