The Azure Functions runtime v4 is here in preview. The big news? Full support for .NET 6.
Why Upgrade?
While v3 is stable, v4 is required for .NET 6. The runtime architecture has been updated to run on the .NET 6 host.
In-Process vs Isolated
You still have the choice. In-process (class library) offers slightly higher performance (no gRPC hops), but Isolated gives you full control. For new greenfield projects in late 2021, I am defaulting to Isolated Process to future-proof against .NET 7/8 updates.
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