How to generate environment-dependent Bicep expressions from Aspire?

[jakub-swastek]

Hi Aspire Team,

We're using Aspire to provision Azure resources, including Azure Cosmos DB.

For Cosmos DB we'd like to configure the backup policy dynamically based on the deployment environment:

• Production -> Continuous30Days
• Non-production environments -> Continuous7Days

If deployment is performed exclusively through the Aspire CLI, handling this in C# is straightforward. However, we also generate Bicep locally and commit it as part of our workflow. During CI/CD, we regenerate the Bicep and compare it with the committed version to detect Aspire version mismatches (and then deploy via Aspire CLI).

While looking for a solution, I found the BicepExpression type:

https://learn.microsoft.com/en-us/dotnet/api/azure.provisioning.expressions.bicepexpression?view=azure-dotnet

However, I haven't been able to find much documentation or any practical examples showing how it can be used within Aspire/Azure Provisioning resources to emit conditional expressions into the generated Bicep and in a same time handle C# value assignment.

Is this a supported scenario? I'm starting to wonder whether Bicep generation is overengineering this use case.

Thanks!