Mattias Karlsson

@devlead.se

2490 Followers 610 Following

Partner & Technical fellow at WCOM AB .NET Microsoft MVP. Been coding since the ’80s (C128 & Amiga). Father of 2, husband of 1. Occasionally blogs at https://devlead.se

Screenshot: You have used 90% of the Actions storage included for the devlead account

Console output of the dotnet-outdated tool updating a file-based app SDK

✗ You have exceeded your monthly quota

Table of Cake build continous integration for each commit,where latest addition is RWX.

Screenshot GitHub PRs created by a single user using Cursor in a day in May:
Opened 1,191 pull requests in 301 repositories

"You Wouldn't Steal a Car" as shown in the art from the anti-copyright infringement campaign known as "Piracy. It's a crime."

Screenshot of console stating: "Total reclaimed space 1.613TB."

Delivery middle of river

Volvo 7900 Electric Bus

Maze console output from a single-line C# program piped into dotnet run

Important Notification Request

Allow important notifications from Snipping Tool ?

Photo of breath turing into crystal breath fog pitch black night on narrow road.

Screenshot of JSON where the schema says array, but the reality you get an object

Thanks for the correction. I learned the correct...

Screenshot of table of contents, which now contains "dotnet project convert"

Chat GTP fails because Cloudflare: "Please unblock challenges.cloudflare.com to proceed."

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.

Sticker table at Øredev

FAST
Your Internet speed is
2.3 Gbps

Prompt replying: You're absolutely right! That's a much more efficient approach. Instead of

Loni - Jack Russell terrier

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.

Azure Pipelines screenshot of many red x:s of failed builds until one final green check mark.

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

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

Usage
- name: NuGet Login
uses: NuGet/login@v1
with:
user: my-nuget-username

Photo of Cisco Catalyst Console Port

Photo of a Windows blue screen of death.

Picture of down hill slopes, helmets and waffles.
Captioned: TGIF 🚲

Screenshot of keyboard, control circled in red.

Jack Russell puppy Loni in lap with cup of coffee, balcony railing and sky on the background.

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]

Congratulations!
Mattias Karlsson,

We’re pleased to welcome you to another year for the Microsoft Most Valuable Professionals (MVP) program in recognition of your outstanding contributions to the community in the following Technical Area/s:

DevOps
.NET

Loni, 7m Jack Russell terrier

Brilliant! That's a much cleaner and more efficient approach. Your solution elegantly solves all the issues I was struggling with. Let me implement this:

Single-file and no project C# being executed by "dotnet cake".

Screenshot of a single-file no project C# program with IntelliSense in VSCode

Screenshot of Ladybird built from the latest GitHub commit on Ubuntu, browsing Bluesky, a blog, and Mastodon.

Screenshot of 5-minute rough PoC of static usings providing top-level Cake scripting methods.