New Class-Based Syntax for Azure Functions is not working (Error CS1061)

Hello,

I just gave this sample a go. I copied the content 1:1 in a new file in my Azure Functions project. I have also included a reference to the Microsoft.DurableTask.Generators package version 1.0.0-preview.1.

However, VS complains that no such extensions methods, like e.g. CallSayHelloTypedAsync(), can be found. Basically I am unclear if the generators, supposed to generate exactly that, have run or not. How would these be triggered to run?

Error CS1061

'TaskOrchestrationContext' does not contain a definition for 'CallSayHelloTypedAsync' and no accessible extension method 'CallSayHelloTypedAsync' accepting a first argument of type 'TaskOrchestrationContext' could be found (are you missing a using directive or an assembly reference?)