是否可以在 azure function 应用程序中创建主题订阅？

Question

I do know we can create a subscription in ASB, but I wanted to know if the subscription does not exist, can we create one in the azure function app itself? To give more context, if there is a topic trigger in my function app, I want to check if the subscription exists or not. If it does, it uses it, but if not needs to create a new one.

Answer 1

That'd be a chicken and egg situation. The entity has to be there for a function to be triggered by an entity (queue or subscription on a topic). Otherwise, there's no message to receive that would trigger the function in the first place.

You can work around it by running during Function's initial start-up, but that's not something that is supported by the Functions service natively. In my post I show how to achieve that using FunctionsStartup (In-Proc SDK). A similar approach could be used with the Isolated Worker SDK.

You can also express your interest in the feature to be provided by Functions if you'd like by letting the team know .