.Net 5 - Asp.Net still has no SynchronizationContext?

Question

I would like to know if .Net 5 based ASP.Net applications still has no SynchronizationContexts as mentioned here so I can continue to not write ConfigureAwait(false) or should I start sprinkling it all over?

Answer 1

No, ASP.NET does not have a sync-context any more, and is extremely unlikely to ever regain one without a huge fight. You could verify this yourself by testing whether SynchronizationContext.Current has a value.

That said, if you're writing application level code, if there was a sync-context, you probably shouldn't be suppressing it; only library code should usually suppress sync-context, and library code should probably not make assumptions about the host environment, meaning: in library code you should probably add ConfigureAwait(false) manually if you don't want sync-context.