Azure Functions v1 not running in Rider 2026.2

Question

After updating to Rider 2026.2, Azure Functions v1 projects no longer run, whereas Azure Functions v4 projects work correctly. Has support for Azure Functions v1 been removed in Rider?

Answer

Support for Azure Functions v1 has not been officially removed in Rider 2026.2. However, since official support for Azure Function v1 by Microsoft is scheduled to end on September 14, 2026, the primary development focus has shifted towards maintaining Azure Functions v4. To ensure that an Azure Functions v1 project runs in Rider 2026.2, follow the steps below:

1. Download Azure Function Core Tools v1 from this link.

2. Extract the downloaded file and specify the path to the Azure Functions Core Tools in Rider via Settings | Tools | Azure | Functions.

   

3. Note that for Azure Functions v1, the func.exe executable is stored in the root folder of the core tools. By default, Rider expects func.exe to be located in the in-proc8 subfolder, as it is for Functions v4. To resolve this discrepancy:

   • Manually create a subfolder named in-proc8 in the root folder of the v1 core tools.
   • Copy all core tools files into this new in-proc8 subfolder.

   Failure to perform this step may result in the following error:

   

If these instructions do not resolve the issue, please provide the full error message and contact Rider support.