How to migrate Azure Functions v3 to .net core 5.0

Question

I have upgraded all assemblies in an Azure Function v3 project to version 5.0 but I am unable to run the function. Here it is my function's csproj file's partial definition:

<PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <AzureFunctionsVersion>v3</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Storage" Version="4.0.3" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="3.0.11" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.SignalRService" Version="1.2.2" />
    <PackageReference Include="System.Net.Http" Version="4.3.4" />
  </ItemGroup>

What's the necessary workaround to make this function with .NET 5? Google did not yield anything conclusive.

Further info: 5.0.100 [C:\Program Files\dotnet\sdk]

This is one of the error messages that I get:

Could not load file or assembly 'Microsoft.Extensions.Configuration.Abstractions, Version=5.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Yuu

Functions don't support .NET 5 yet, they estimate this to be ready end of this year. See this GitHub comment: github.com/Azure/azure-functions-host/issues/… – Markson

It supports .NET Core 5 as of yesterday. It has been in preview mode for awhile, but it is now GA. – Cyclo

Now that support for .Net Core 5 is live, could you update your accepted answer. The bottom one contains links with a lot of great stuff. – Thesaurus

I am getting same error, is it resolved? – Potvaliant

Answer 1

The comment by @Marc is correct, currently Azure Functions do not support .net 5. Current ETA is a preview by end of year.

Please keep an eye on this github issue for any updates.

Sheen

Okay so in this case should we downgrade and use 3.0 on linux? – Sankey

It's live as of yesterday. – Cyclo

Answer 2

Azure functions team released support for .Net 5 by introducing a new isolated process model to run .NET function apps.

You can read more about this in the announcement.

To migrate you function app to .Net 5 you can follow this guide.

Alessandro

Although that link does go to some of the best info out there on Azure Functions 5, it isn't a migration guide. Would love it if you could link to one. – Cyclo

Answer 3

Dave Brock created a web page explaining the process using the preview bits. But I believe it should be close enough for the release bits. See here.

Looks like Brandon Minnick's guide is more comprehensive. See here.

Tatyanatau

Why do people keep linking guides for "creating" when the desire is to migrate existing code. – Kernite

Looks to me that both linking guides do contain a lot of interesting things about migrating. – Thesaurus