This is quickly becoming a hill I'm willing to die on. Just because something is created with AI, it does not make it slop or bad quality or a waste of somebody else's time. AI is a tool and if you use it well, you can create high-quality stuff much faster than without.

Data models evolve, but the old JSON payloads don't just disappear. They sit in databases and queues or keep arriving over the wire from old clients. Wrote a post on how to handle evolving C# types and data at rest without the headache: egilhansen.com/2026/06/11/e... #dotnet

A trick for making @simoncropp.bsky.social’s Verify play nice with AI agents: egilhansen.com/2026/05/05/v...

This video does a great job covering the good and bad sides of open source software. The researcher from Microsoft gets a lot praise for discovering the hack, but the real hero is the sole developer from Finland who has been supporting the XZ library for free for 20 years: youtu.be/aoag03mSuXQ?...

Thanks Stacy.

Want more of this? Back in October, I did a presentation on this exact topic at @hellostavanger and it covers a bunch of extra details and examples we didn’t get to in the podcast: youtu.be/yT1ckNTCW60?...

You write tests. But are they helping you and your team? In this .NET Rocks! episode, @egilhansen.com explores how to make tests more durable, insightful, and future-proof. Plus: should AI be writing your tests? 🤖 #dotnet 🎧 Listen here: msft.it/63323sFo2T

Always a please chatting with Carl and Richard on their podcast!

@simoncropp.bsky.social do you have a list of does and donts in snapshot testing somewhere? Examples of good patterns and anti patterns with Verify?

If the facts are as the article lays them out, I hope one of my friends from #microsoft will make this right. Adherence to OSS licenses is important! philiplaine.com/posts/gettin...

Yep, saw this live. Huge respect for people that dare to be vulnerable; it’s such a powerful thing.

Need a cure for that primitive obsession in #dotnet? Take a look at www.nuget.org/packages/Egi... First real attempt at a source generator library. Happy with the result. A key feature is that it’s very easy to overwrite the default generated code, just as it is with C# record classes and structs.

Going live with @steven-giesel.com for the first #bUnit dev session of this month. We may even get a visit from @scottsauber.com :) Join at twitch.tv/egilhansen and www.youtube.com/watch?v=jZrZ...

This could be said about the internet in general.

Hey folks, @steven-giesel.com and I just went live with another #bunit dev session. Come hang and lets build v2 together. www.youtube.com/watch?v=fvBn... and twitch.tv/egilhansen

@captainsafia.com does (or will) #dotnet's OpenApi generator have a way to declare a custom schema transformer for type as an attribute, like we can with JsonConverter? E.g.: [OpenApiTransformer<MyIdSchemaTransformer>()] public record MyId(int Value);

For all the Open Source Maintainers, a message to the world.

I like the way Rob phrases this, software is free, maintainers time is NOT. I’ll consider this for new projects going forward.

Hey #dotnet, #blazor, and #bunit friends, me and @steven-giesel.com are live with another bUnit dev session. Come join us on www.youtube.com/watch?v=Nw68... and twitch.tv/egilhansen.

A solid analysis by @anderspucknielsen.dk cutting through the media buzz created by Trump and co and providing a reasonable assessment. www.youtube.com/watch?v=TWLq...

Another excellent rendition of the #swetugg conference is in the bag. Really great conference; food, venue, organizers, and sessions were all top notch. Big recommendation from me!

Hey @stevejgordon.bsky.social, we chatted about OTel telemetry aggregation at NDC London. You mentioned you have a processor that does this, and that you could share it. Consider yourself nerd sniped :)

Any .NET devs from Japan in my network?

Ok I think 1100 tests are enough for now. FusionCache v2 is right around the corner 😬

Spot on @aaronontheweb.bsky.social, well written: aaronstannard.com/relicense-or...

Going live with @steven-giesel.com in a couple of minutes for another #bUnit dev session. Come hang and help us build v2. Watch at: - www.youtube.com/watch?v=m_GM... - twitch.tv/egilhansen

FluentAssertions have moved dual license (free for open source/paid for corp work) with their v8, and as expected people are blowing a gasket. Please remember, @dennisdoomen.com and co do not owe you their free time in perpetuity. Stay on v7, buy a license, or move on. Be thankful, don't bitch ❤️

#azure #mvpbuzz friends, if I have an ACA environment with dedicated workload profile, minimum capacity > 2, and zone redundanzy turned on, and I have a container app in the environment with minReplicas > 2, am I then guaranteed to have my container replicas placed equally between the ACA instances?

I can't believe @anderspuck.bsky.social got through his Greenland explainer with a straight face. Strange days again. Prolly stranger. youtu.be/GlK3f1cs_l4

Starting a new Azure project at work and was reminded how long it takes to develop IaC scripts (bicep). The developer-inner-loop is soooo slow, test running the scripts takes minutes, especially when provisioning resources that involve vnets or other networking resources. Tips are welcome!

@anderspuck.bsky.social you mention in a recent video that Russia is not after land, but after direct and indirect influence/control over Ukraine, like it seemingly has over Belarus. That makes sense to me. A, perhaps stupid, next question I have is “why?”

@xunit.net what changes if we (#bUnit) add the IAssertionException and ITestTimeoutException interfaces to our assertion exception types? @steven-giesel.com and I tried to add the interfaces and when running tests we do not see a difference in the output either way.

Come join!

Driving home after Christmas from Akureyri to Reykjavik in Iceland with icy but beautiful mountain crossings is hard to complain about.

For the longest time I saw the hand in the 🫡 emoji as a long nose, aka a Pinocchio reference, which at times caused confusion 😆

This triggers me. Troy posts a link to a tweet by somebody other than him on X, folks then demand he makes the content of the tweet thread available to them here because they don't want to go to X or sign in to X 🤦 Don't want to be on X, fine, that's a YOU problem. Not a Troy problem.

“Let’s me build a simple game in #dotnet orleans over the holiday, will be fun to learn” I said. Get hello-world working in a few hours 🙌 Now to deploy to Azure. Let’s use Container Apps. 3 days of yml and bicep later hello world now runs online 🤦 IaC always takes longer than expected.

So it seems #blazor has entered the big leagues. Apparently used by a certain adult website for “age verification pages” in US states that requires such a thing. www.reddit.com/r/Blazor/s/7...

What presentations made you think this year? I'm in full vacation mode so need something to watch during the holidays. For me, the Deep #dotnet video series has been excellent: youtube.com/playlist?lis...

Dennis is spot on. #OSS is not free. You take a risk by depending on it because you have little leverage over the people who built it. No contract or support agreement that ensure timely fixes. Be proactive support the maintainers of the OSS that critical to your business.

Playing with #dotnet #aspire custom commands. This "Import database backup" command will connect to another database, create a bacpac of it, and then import the bacpac into the Aspire database resource. Seems to work, would love suggestions for improvements! gist.github.com/egil/f3a9d42...

#dotnet friends, since #xunit v3 has a TestContext type, should #bUnit rename its TestContext to BunitContext in v1 (planned for v2) and make TestContext as obsolete? That avoids the same naming conflicts that already exists with NUnit and MSTest. And would it be considered a breaking change?

It's v3 1.0.0 release day! We are excited for you to try out our newly redesigned testing framework. Release notes: xunit.net/releases/v3/... xunit.net/releases/ana... xunit.net/releases/vis... #DotNet #CSharp #FSharp #UnitTest #TDD

Going live with @egilhansen.com 13:35 UTC for more #bUnit / #blazor content. Wrapping up the #dotnet 9 stuff and the year 2024! Find us: www.youtube.com/watch?v=bF0b... www.twitch.tv/egilhansen www.youtube.com/watch?v=Ecbm...

Thank you @captainsafia.bsky.social for sponsoring me on @github.com. That’s very cool of you! ❤️

If you find my work in the #dotnet open-source community useful and you (or your company) would like to support my efforts, doing so through GitHub Sponsors is an excellent choice. Learn more here: github.com/sponsors/egil

Folks using #Azure Data Explorer, aka #ADX, how are you deploying schema updates (tables, materialized views, update policies)? I.e., is there a FlywayDB/efcore migrations/dacpac tool for ADX?

The 2025 #MvpSummit in-person event is apparently full. Didn't think it was possible, it's such a huge campus. Glad I got my ticket.

I have a #dotnet 9 solution with an #aspire apphost. If I want to use the Performance Profiler in Visual Studio, how can I make it target the web app, and not the startup project (Aspire apphost)? Changing the target to "Running process" does not have the same tools available. cc. @davidfowl.com

This is amazing news. Going to make local dev and testing easier.