Azure Function Core Tools incorrectly default to .NET 6 when creating an in-process Function

[gabrielweyer]

Version

Using latest .NET 8 SDK (8.0.404) and Azure Function Core Tools (4.0.6610). I removed and installed Azure Function Core Tools again after installing the latest .NET 8 SDK.

> func version
4.0.6610

> dotnet --info
.NET SDK:
 Version:           8.0.404
 Commit:            7b190310f2
 Workload version:  8.0.400-manifests.996cfe54
 MSBuild version:   17.11.9+a69bbaaf5

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19045
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\8.0.404\

.NET workloads installed:
Configured to use loose manifests when installing new manifests.
There are no installed workloads to display.

Host:
  Version:      8.0.11
  Architecture: x64
  Commit:       9cb3b725e3

.NET SDKs installed:
  3.1.426 [C:\Program Files\dotnet\sdk]
  6.0.428 [C:\Program Files\dotnet\sdk]
  7.0.410 [C:\Program Files\dotnet\sdk]
  8.0.111 [C:\Program Files\dotnet\sdk]
  8.0.404 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  None

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

Description

Azure Function Core Tools incorrectly default to .NET 6 (unsupported since November 12, 2024) when creating an in-process Function. It should use .NET 8 (the current LTS) instead when --target-framework is not specified.

Steps to reproduce

# This incorrectly creates a .NET 6 in-process Function, it should default to .NET 8 (that's the current LTS)
func init MyProjFolder --worker-runtime dotnet

Forcing the Function App to use .NET 8:

# This creates a .NET 8 in-process Function
func init MyProjFolder --worker-runtime dotnet --target-framework net8.0

[mattchenderson]

Thanks for flagging this. We have precedence from changing the default version in the isolated worker model. Updating the default for the in-process model would help with consistency and prevent folks from inadvertently landing on an unsupported version.

For whoever ends up picking this item up, this likely would be a change to the following line, with corresponding test updates:

azure-functions-core-tools/src/Azure.Functions.Cli/Actions/LocalActions/InitAction.cs

Line 64 in 208362c

private const string DefaultInProcTargetFramework = Common.TargetFramework.net6;