Hi Team, I have a requirement where I need to find the .net runtime version used in my function apps. Below are imp points - Target framework in csproj file of function app is net6.0. On Azure portal,. under app settings of function app, value of FUNCTIONS_WORKER_RUNTIME is dotnet. On Azure portal, under app settings of function app, value of FUNCTIONS_EXTENSION_VERSION is ~4. On Azure portal. under Function app -> Overview -> Properties -> Runtime stack is .NET - v4.0 Could you please mention what .net runtime version is being used in function app? Thanks, Salil

Target framework in csproj file : The csproj file specifies the target framework as net6.0 , indicating that the function app is targeting .NET 6.0. FUNCTIONS_WORKER_RUNTIME : The value of FUNCTIONS_WORKER_RUNTIME environment variable is set to dotnet , which signifies that the function app is using the .NET runtime. FUNCTIONS_EXTENSION_VERSION : The value of FUNCTIONS_EXTENSION_VERSION environment variable is ~4 , which corresponds to version 4 of the Azure Functions runtime. This version is compatible with .NET 6.0. Function app overview properties : The "Runtime stack" property in the Function app overview indicates that the runtime stack is ".NET - v4.0". This might seem confusing, but in the context of Azure Functions, it refers to the version of the Azure Functions runtime stack, not the .NET runtime version. The Azure Functions runtime version 4.0 is compatible with .NET 6.0. Considering all these points together, the function app is using the .NET 6.0 runtime. If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated. hth Marcin

.Net runtime version for function app

Salil Singh 20

Hi Team,

I have a requirement where I need to find the .net runtime version used in my function apps. Below are imp points -

Target framework in csproj file of function app is net6.0.
On Azure portal,. under app settings of function app, value of FUNCTIONS_WORKER_RUNTIME is dotnet.
On Azure portal, under app settings of function app, value of FUNCTIONS_EXTENSION_VERSION is ~4.
On Azure portal. under Function app -> Overview -> Properties -> Runtime stack is .NET - v4.0

Could you please mention what .net runtime version is being used in function app?

Thanks,

Salil

1 answer

Marcin Policht 12,940 Reputation points MVP

2024-04-04T11:43:44.26+00:00
Target framework in csproj file: The csproj file specifies the target framework as net6.0, indicating that the function app is targeting .NET 6.0.

FUNCTIONS_WORKER_RUNTIME: The value of FUNCTIONS_WORKER_RUNTIME environment variable is set to dotnet, which signifies that the function app is using the .NET runtime.

FUNCTIONS_EXTENSION_VERSION: The value of FUNCTIONS_EXTENSION_VERSION environment variable is ~4, which corresponds to version 4 of the Azure Functions runtime. This version is compatible with .NET 6.0.

Function app overview properties: The "Runtime stack" property in the Function app overview indicates that the runtime stack is ".NET - v4.0". This might seem confusing, but in the context of Azure Functions, it refers to the version of the Azure Functions runtime stack, not the .NET runtime version. The Azure Functions runtime version 4.0 is compatible with .NET 6.0.

Considering all these points together, the function app is using the .NET 6.0 runtime.

If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

hth

Marcin
Please sign in to rate this answer.
Salil Singh 20 Reputation points

2024-04-04T12:08:51.1566667+00:00

Hi @Marcin Policht ,

Thank you for above reply.

I have a question for #4, I just created a new function app (on Azure Portal), using RunTime Stack as .Net and Version as 6 LTS in-process model. once the app is created, under Overview -> Properties, I see the Runtime stack as .NET 6.0, how this could be defined in context of Azure Functions as no extension version of function app is .NET - v6.0.

Requesting to please explain this.

Thanks,

Salil

Marcin Policht 12,940 Reputation points MVP

2024-04-04T12:13:33.4133333+00:00

The discrepancy you're observing between the runtime stack shown in the Azure portal's Overview -> Properties section and the absence of a corresponding extension version like ".NET - v6.0" in the Function app's app settings can be explained by how Azure Functions manages runtime environments.

When you create a new Function app in the Azure portal and specify the runtime stack as ".NET" with version "6 LTS in-process model," you're indicating that your Function app should use the .NET 6.0 runtime for executing functions. However, the specific versioning and management of the runtime environment, including the extension version, are handled internally by Azure Functions.

Here's why you might not see an extension version like ".NET - v6.0" explicitly listed in the Function app's app settings:

Dynamic runtime environment: Azure Functions manages the runtime environment dynamically and abstracts away the underlying details from users. This includes managing the installation and configuration of runtime extensions, such as the .NET runtime, behind the scenes.

Extension versions: The extension versions associated with each runtime stack (e.g., ".NET - v3.1", ".NET - v5.0") are primarily used for internal management and compatibility purposes within Azure Functions infrastructure. While you can specify the runtime stack version during Function app creation, the specific extension version may not be exposed directly to users in the portal.

Compatibility and updates: Azure Functions regularly updates the runtime environments and extensions to ensure compatibility, security, and performance improvements. The absence of a specific extension version in the portal's app settings doesn't necessarily mean that the Function app isn't using the .NET 6.0 runtime; it simply indicates that the versioning details are managed internally.

If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

hth

Marcin

Salil Singh 20 Reputation points

2024-04-04T13:23:42.9833333+00:00

Hi @Marcin Policht

Thank you for above reply.

I understand above explanation but still think that under Azure Portal ->Function App -> Overview -> Properties, the Runtime stack refers to .net runtime.

Also, wanted to update for the function app where I am seeing the the Runtime stack as .NET 4.0, is an older app which is created through ARM template. In ARM template I could not find any setting as Runtime Stack. Also, as this is an older app, Target Framework in csproj file of function app (from code) was earlier having older .net versions listed in it, now it is .net 6.0. Is it possible that when for the first time function app in code(Visual Studio) was published to function app on Azure portal, based on the targetframework mentioned on csproj file, function app on azure portal took Runtime stack as .Net v4.0, and it was never updated after that even though csproj file with latest target framework was published to same app.

Requesting to please let me know your thoughts.

Thanks,

Salil

Salil Singh 20 Reputation points

2024-04-04T16:48:54.45+00:00

Hi @Marcin Policht

I had 1 additional observation, ran below command to verify the .net framework used by function app -

az functionapp config show --name 'fnappname1' --resource-group 'fnapprg' --query "netFrameworkVersion"

it shown v4.0, just wanted to check, still understanding is the .net framework that function app is using is .NET 6.0 runtime. Is this correct?

Thanks,

Salil

Salil Singh 20 Reputation points

2024-04-05T09:48:10.16+00:00

Hi @Marcin Policht

Could you please reply to above queries.

Thanks,

Salil

Salil Singh 20 Reputation points

2024-04-08T11:04:08.1533333+00:00

Hi @Marcin Policht

Requesting to please reply to above queries.

Thanks,

Salil
Sign in to comment

Share via

.Net runtime version for function app

1 answer