Function app .Net framework version

Question

Hi Team

I am working on a requirement where I need to find out the .Net framework version used in the function apps. In case it is .Net6, I need to convert it to .Net8.

Below are details on function apps -

1. Target framework in csproj file of all function app projects is net6.0.
2. On Azure portal, under app settings of function apps, value of FUNCTIONS_WORKER_RUNTIME is dotnet.
3. On Azure portal, under app settings of function apps, few function apps having value of FUNCTIONS_EXTENSION_VERSION as ~4, few having ~3.
4. On Azure portal. for all function apps, under Function app -> Overview -> Properties -> Runtime stack is .NET - v4.
5. az functionapp config show --name 'fnappname1' --resource-group 'fnapprg' --query "netFrameworkVersion"

above command giving output as v4.0 for all function apps.

Please let me know what is the .Net framework of the function so that I could decide if function app is right candidate to be converted to .Net8.

Thanks,

Salil

Answer 1

Hi Salil

As I understood, you just want to know which .Net version your Function uses.

Your functions are likely written for the .NET runtime (specifically .NET 6 based on the csproj file), not the .NET Framework. The seemingly conflicting settings might be due to:

• Outdated app settings (FUNCTIONS_EXTENSION_VERSION) do not reflect the actual runtime usage.
• Azure Portal's generic runtime stack representation.

Please use the following instruction/manual to migrate to .Net 8: https://learn.microsoft.com/en-us/azure/azure-functions/migrate-version-3-version-4?tabs=net8%2Cazure-cli%2Clinux&pivots=programming-language-csharp

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