[release/6.0] Run user defined hosted services before the server starts. #36133
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…ric web hosted service is added before any user code runs, as a result its impossible to write a hosted services that run before server startup. This behavior differs from what happens when you use the Startup class today. We call ConfigureServices then we add the IHostedService implementation that starts the server. This change mimics that behavior by adding the initial set of hosted services after your code runs. - Added a test
Co-authored-by: Stephen Halter <[email protected]>
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Backport of #36122 to release/6.0
/cc @davidfowl
Customer Impact
Customer use hosted services today to run logic before the server starts. This allows them to prewarm various caches or run any logic that has to run before the server starts. In particular this is easy to do if you own main, but when you're a library, hosted services end up being the answer.
Testing
Added a unit test and did manual testing.
Risk
Low. This is a breaking change between rc1 and rc2 but it's preserving the behavior of the hosts that have come before it, in particular, the web host.