Unable to publish .NET5 function app without forcing wrong worker runtime value

I’ve created a function app on azure using following command

az functionapp create --name <APP_NAME> --storage-account <STORAGE_ACC> --plan <SERVICE_PLAN> --resource-group <RESOURCE_GROUP> --runtime dotnet-isolated --runtime-version 5.0 --functions-version 3

Created a .NET5 function project using func init and selecting dotnet isolated option.

When I try to publish the app

func azure functionapp publish <APP_NAME>

I get following message: Your Azure Function App has 'FUNCTIONS_WORKER_RUNTIME' set to 'dotnetIsolated' while your local project is set to 'None'.

If I specify the language in the end of the command

func azure functionapp publish <APP_NAME> --csharp

I still get the error: Your Azure Function App has 'FUNCTIONS_WORKER_RUNTIME' set to 'dotnetIsolated' while your local project is set to 'dotnet'..

So each time I deploy the function I have to use the --force switch and update the value on Azure Portal after the Function app is deployed.

[asparrowhawk]

@gzdorik-brightgrove Have you changed to the build output directory or publish directory before you issue the func azure functionapp publish command? Is the local.settings.json file present in the directory? The only time I saw “Can’t determine project language …” message was when the local.settings.json file was not present in the directory.

For your information:

❯ func --version
3.0.3442

[asparrowhawk]

@RyanMarcotte I have been having the same issue, but have been using a cut down local.settings.json file in the same publish output directory:

{
  "IsEncrypted": false,
  "Values": {
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
  }
}

As I expect the additional values, for AzureWebJobsStorage etc, would overwrite those already setup in Azure.