Problem in my local paradise: Func CLI doesn't upgrade

Last Friday, I encountered an issue while trying to run my Azure Function locally using VS Code. Despite having installed the Azure Function extension and the Azure Functions Core Tools, I was unable to execute the func start command without encountering an error saying that no functions could be found. 

In this post, I will share the various troubleshooting steps I took, what didn’t work, and how I ultimately resolved the issue. Spoiler alert: everything is now working correctly.

The Problem

My Azure Function is a .NET 8 Isolated HTTP trigger. When I attempted to execute the func start command, it failed to find any functions. A quick look at the documentation, I discovered that version 4 of the Core Tools was required for type Isolated process. However, I had already installed version 4 via the update popup in VS Code.

Something was wrong. I tried func --version and it returned 3.x.xx, weird... And this is how I knew there was a problem.

Failed attempts

Following the Azure Functions Core Tools documentation I found that there were multiple methods to install the Core Tools. Because that laptop was on Windows 11, I started by downloading the func-cli-x64.msi installer and run it. It didn't work, the version 3 was still there.

I tried to install the Core Tools v4 using NPM: npm install -g azure-functions-core-tools@4. It didn't work.

I tried to uninstall the version 3 with npm uninstall -g azure-functions-core-tools. I tried using the command palette in VSCode

Still nothing was changing anything, the version 3 was still there.

The Solution

What works, was using Chocolatey command choco uninstall azure-functions-core-tools to uninstall the version 3. Some how, it must have been install at the different location or some "config" got lost at some point (it's a developer laptop after all), and the other methods (npm, msi, vscode) couldn't see that version 3 was installed.

After that, I installed the version 4 using NPM npm install -g azure-functions-core-tools@4. And it worked! The func --version returned 4.0.5571 and the func start command found my function.

I wrote this quick post hoping that it can help someone else, as I cannot be the only one with this problem.

~Frank

Reading Notes #595

It is time to share new reading notes. It is a habit I started a long time ago where I share a list of all the articles, blog posts, and books that catch my interest during the week.

 

If you think you may have interesting content, share it!

Programming

• .NET Aspire preview 4 - .NET Aspire - So much in this new release! So many possibilities.

• Generate Local .NET Secrets from Azure Deployments (Frank Boucher) - Nice new simple to get started.

• Unity extension for Visual Studio Code - Now Generally Available (Jb Evain) - That's an interesting idea! I'm not a Unity developer, but I'm curious to see the response from the community.

• Blazor Basics: Advanced Blazor Form Validation (Claudio Bernasconi) - Having control on the validation and how we guide our users is a must. This post does a great job at explaining how to to it within Blazor with clear and simple code sample.

• An introduction to the heap data structure and .NET's priority queue (Andrew Lock) - Great post that the explains how to understand the heap. This source of information could be so useful when investigating something that doesn't work as expected in our code.

• Lightweight In-Memory Message Bus Using .NET Channels (Milan Jovanović) - Messages queues are such a powerful tool when our solution work asynchronously. This nice tutorial shows us how to do it and stay local.

AI

• An Introduction to Mistral AI (https://www.freecodecamp.org/news/an-introduction-to-mistral-ai/) - An interesting alternative to GPT when text is involved.

• Get started with .NET 8 and AI using new quickstart tutorials (Jordan Matthiesen) - Five extremely simple example application to explain different AI scenarios in .NET and an opportunity to give your feedback.

Databases

• RavenDB and Two Factor Authentication (Oren Eini) - Good news! Always use the two factor authentication when available.

Miscellaneous

• This Is The Easiest Way To Make Your Life More Awesome - Barking Up The Wrong Tree (Eric Barker) - Love it! Don't be stuff buy time.... Nice post

~Frank

Reading Notes #594

It is time to share new reading notes. It is a habit I started a long time ago where I share a list of all the articles, blog posts, and books that catch my interest during the week.

If you think you may have interesting content, share it!

Cloud

• Managing your Azure Resources with Deployment Stacks (John Kilmister) - That's a very useful tool, and nicely documented.

Programming

• Extract Method Refactoring Technique in C# – What You Need To Know (Nick Cosentino) - Great post that go over one of the most powerful method that every developers will be using all along their career. Simple and so useful, it's a must!

• Dapr v1.13 is now available (Dapr project maintainers) - I really like those post that goes over the news and also named all the contributors. This is when you see how many people are involved.

• Are Containers Only for Microservices? Myth Debunked (Zubair Aslam, Jay Schmidt) - Interesting post that demystify the myth about container by in only for micro services.

• Marten 7.0 is Released! (Jeremy D. Miller) - Nice update. Version 7 already...

• How to Fix CORS Error With AnyOrigin and AllowCredentials (Code Maze) - Anyone who work or build API go that error message about CORS. Here is a nice post to learn more about it and understand who we can fix it in an API.

AI

• RAG is Dead. Long Live RAG! (David Myriel) - Nice post that explains the differences between two type of AI RAG and LLM.

Databases

• Get Started with Milvus Vector DB in .NET - .NET Blog (Luis Quintanilla) - This post starts by explaining what's a vector databases and than show a nice example with movies.

~Frank