Mattias Karlsson
LightNews LightNews
banner
devlead.se
Mattias Karlsson
@devlead.se
2.4K followers 600 following 1.8K posts
Partner & Technical fellow at WCOM AB
DevOps and Developer Tools Microsoft MVP.
Been coding since the ’80s (C128 & Amiga).
Father of 2, husband of 1.
Occasionally blogs at https://devlead.se
Posts Replies Media Videos
devlead.se
🛸 Tomorrow at 12:00 am
in Pacific Standard Time (UTC-08:00)
/ 9:00 am my time (CET)

I'll be speaking @dotnet Conf about using .NET file-based apps for your GitHub Actions DevOps workflow, using C# instead of YAML, for a more joyful experience🚀

www.youtube.com/@dotnet/live

#dotnet #devops #csharp
GitHub Actions DevOps Pipelines as Code using C# and Cake SDK Mattias Karlsson Build and release configuration as code has become the de facto approach for most continuous build and release solutions today. Most commonly, this is done through a custom task-based, debug-resistant domain-specific language using YAML or JSON files. But what if, instead of using a markup language, you could use a proper programming language with well-defined and documented control structures, flow statements like for, while, and do, and the full expressive power of C#? In this session, we will go step-by-step through how you can orchestrate your GitHub Actions build and release pipelines using C#, powered by the Cake SDK and the latest features of .NET 10. You will see how to test and debug your pipeline locally without the slow push-and-wait cycle for CI to fail or succeed. Using standard developer tools like VS Code, you can reuse the language skills your team already has, reducing friction and unnecessary context switching.
November 13, 2025 at 5:59 PM
devlead.se
C# file-based apps let you do what young me did with BASIC at computer shops in the 80s🤣
#dotnet #charp
November 12, 2025 at 9:24 PM
devlead.se
Who's waiting, I'm shipping now 😎🚀
November 11, 2025 at 2:54 PM
devlead.se
Nice found a sticker table @oredev.org 🤩

#Oredev2025
Sticker table at Øredev
November 7, 2025 at 10:50 AM
devlead.se
VIM karaoke @oredev.org , what not to love about that ❤️
November 6, 2025 at 6:30 PM
devlead.se
Have you ever yelled at a YAML file?

Today at 3:50 PM, Horizon room at @oredev.org

Let’s talk about using C# for your DevOps pipeline, spending less time debugging remote logs, and more time shipping features.

...also I brought stickers🍰

oredev.org/program/94bb...

#dotnet #csharp #oredev2025
November 6, 2025 at 9:49 AM
devlead.se
You're making me feel like a Luddite...😎
FAST Your Internet speed is 2.3 Gbps
October 27, 2025 at 9:22 PM
devlead.se
Will you be @oredev.org? I'm be there! Don't be a stranger! 🛸
Øredev visual I'm attending with my Avatar and dates for the conference (5-7th Nov 2025)
October 23, 2025 at 7:29 PM
devlead.se
Most days I'm not worried about AI replacing my job, as I several times get responses like "You're absolutely right! That's a much more efficient approach.".
What worries be is people that without reflection just accepting what it suggests...🤔😎
Prompt replying: You're absolutely right! That's a much more efficient approach. Instead of
October 14, 2025 at 8:17 AM
devlead.se
Maybe trick them with a cute puppy?
Loni - Jack Russell terrier
October 10, 2025 at 5:31 PM
devlead.se
Getting something to build, unit & integration test on 15 different CI / OS configurations may cause yak shaving... but totally a good feeling when all ✅🤩
#dotnet
Screenshop of GitHub "Add .NET 10 support" WIP PR with 16 successful automated checks, 5 different CI systems, Windows, MacOS, and multiple Linux distros. Running on VMs, Containers, etc.
October 5, 2025 at 7:47 PM
devlead.se
#YAML #DevOps ❌❌❌❌❌❌❌❌❌❌✅😎
Azure Pipelines screenshot of many red x:s of failed builds until one final green check mark.
October 3, 2025 at 9:51 AM
devlead.se
You mean it goes straight to Google Maps? Here in Sweden, which is in the EU, I get Google Maps as part of the search result
October 2, 2025 at 6:18 AM
devlead.se
I understand potentially why things like this are happening, but it's still unexpected
KQL QUERY let dt = datatable (Int: int, String: string, Bool:bool, Double: double, Decimal: decimal) [ 1, 'a', false, 0.0, 0.0, 2, 'b', true, 1.2, 2.2, 3, 'c', false, 1.1, 2.3, 4, 'a', false, 0.0, '0.0', 5, 'b', true, 1.2, '2.2', 6, 'c', false, 1.1, '2.3', 7, 'a', false, 0.0, decimal(0.0), 8, 'b', true, 1.2, decimal(2.2), 9, 'c', false, 1.1, decimal(2.3), ]; dt becomes result Int String Bool Double Decimal 1 a FALSE 0 0 2 b TRUE 1.2 2.2000000000000002 3 c FALSE 1.1 2.2999999999999998 4 a FALSE 0 0 5 b TRUE 1.2 2.2 6 c FALSE 1.1 2.3 7 a FALSE 0 0 8 b TRUE 1.2 2.2 9 c FALSE 1.1 2.3
September 25, 2025 at 9:26 AM
devlead.se
They've got native TPM 2.0 support, front ports are modular, same as Laptops, so you pick which you want.
September 16, 2025 at 12:10 PM
devlead.se
I'm just a fan 🤣
September 15, 2025 at 7:34 PM
devlead.se
Would recommend something like an ASUS ZenScreen MB16AC, which is great for Teams screen sharing/chat, terminal, have one under my ultra wide (49" Samsung Odyssey G9), also have one in my laptop bag as an extra screen while traveling.

www.asus.com/displays-des...
September 15, 2025 at 7:31 PM
devlead.se
Shipping to prod on a Friday 🚀
First .NET 10 workloads live in prod 🎉
#dotnet
INFO: Successfully connected to container: $ dotnet -- info Host: Version: 10.0.0-rc.1.25451.107 Architecture: x64 Commit: 2db1f5ee2b RID: linux-x64 .NET SDKs installed: No SDKs were found. .NET runtimes installed: Microsoft.AspNetCore.App 10.0.0-rc.1.254 Microsoft.NETCore.App 10.0.0-rc.1.25451. Other architectures found: None Environment variables: DOTNET RUNNING IN CONTAINER DOTNET VERSION
September 12, 2025 at 7:44 AM
devlead.se
You specify an individual user in GitHub Actions yaml, would love if you also could pass an NuGet org
github.com/NuGet/login/...
Usage - name: NuGet Login uses: NuGet/login@v1 with: user: my-nuget-username
September 11, 2025 at 4:37 PM
devlead.se
Photo of Cisco Catalyst Console Port
September 5, 2025 at 1:08 PM
devlead.se
While watching a Omarchy video...
Photo of a Windows blue screen of death.
August 27, 2025 at 2:57 PM
devlead.se
An average speed of 34 km/h is faster than you might think on a Friday... 😎
Picture of down hill slopes, helmets and waffles. Captioned: TGIF 🚲
August 8, 2025 at 10:08 AM
devlead.se
No, it's there
Screenshot of keyboard, control circled in red.
August 5, 2025 at 3:28 PM
devlead.se
A little vacation-ending blues, but life isn’t so bad at 7 a.m. when you’ve got sunshine, a cup of coffee, and a puppy in your lap.🌞☕🐶
Jack Russell puppy Loni in lap with cup of coffee, balcony railing and sky on the background.
July 24, 2025 at 5:29 AM
devlead.se
Nice @cakebuild.net tool works with new #dotnet 10 dnx
dnx cake.tool -- help Tool package cake.tool@5.0.0 will be downloaded from source https://api.nuget.org/v3/index.json. Proceed? [y/n] (y): y USAGE: dotnet cake [SCRIPT] [OPTIONS]
July 15, 2025 at 8:16 PM