Updatading Azure Function from NET 6 to NET 8 (in-process)

Solution/project

In the Function project file (.csproj):

• Change target framework to net 8 <TargetFramework>net8.0</TargetFramework>
• Add (if required) <_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput>

In the function project:

• Update Microsoft.NET.Sdk.Functions to 4.5.0 or later

Example of resulting project file:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
     <AzureFunctionsVersion>v4</AzureFunctionsVersion>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
     <_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput>
  </PropertyGroup>
  <ItemGroup>
     <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
     <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.6.0" />
  </ItemGroup>

In the local.settings.json file, add "FUNCTIONS_INPROC_NET8_ENABLED": "1",

  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_INPROC_NET8_ENABLED": "1",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet",

Deployment

1. From Azure Potal, stop the Function App
2. Environment variables:
   • add "FUNCTIONS_INPROC_NET8_ENABLED": "1"
3. Configuration:
   • set NET Version to "NET 8 (LTS) In-process"
4. Deploy the new version of function app, updated to NET8
5. Start the Function App

If you have issues at the startup, like missing assemblies, try adding <_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput> to the project file, and redeploy the function app.

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