Big improvements to the performance of developing C# file-based incoming. Subsequent builds/runs will cache MSBuild outputs & directly invoke the C# compiler if inputs don't change. This in addition to the work in rc.1 to avoid MSBuild completely for simple file-based apps github.com/dotnet/sdk/p...

Just blogged about it bsky.app/profile/cake... Been working on this on and off since .NET preview 4, custom SDK together with source generator results in a really compelling end user story👍

Hey friends! I did a TEDx talk and it's now up on the TED Conferences YouTube. It's possibly the best and most important talk I've ever done. I would ask that you watch it, and please SHARE it broadly and widely. Thank you! youtu.be/dVG8W-0p6vg #AI #Tech #TED

It is so neat seeing tech like this built on top of the dotnet run app.cs work that we're doing.

"dotnet cake.cs" #dotnet #cake #devops #itshappening #staytuned

Check out all the improvements to file-based apps (dotnet run app.cs) in preview.6 that went out today! github.com/dotnet/core/...

Another STP (Seattle to Portland) bike ride in the books. Did it in two days this year so a bit more relaxing. 4th time doing this ride and still amazed at how gorgeous the landscape is on this route. #stp

`dotnet run file.cs` is coming: Allows running C# source files with no need for an explicit backing project. We call these file-based programs (as opposed to project-based programs). github.com/dotnet/sdk/b...

.NET Lab (lab.razor.fyi) now has Code Actions 🚀 Very useful when you paste some code snippet and want to add missing usings. But it can do much more - all Roslyn code fixes are included.

.NET repos on GitHub are 40 times more likely to use dynamic than define a type called String

And soon just dotnet app.cs 😎 github.com/dotnet/sdk/p...

You can always tell who's worked with me a long time by how they respond to my questions about insane situations: Rookies: Here is why ... and by the way why are you asking that question? Veterans: Here is why and I'm now leaving this chat so you can't tell me why you asked that question.

Building a Debugger is now officially released! It guides you through building a whole native x64 debugger from scratch, dispelling all the magic and teaching you a ton about operating systems as it goes. Even if you don't care about building a debugger, you can read it to your cat.

Trick I’ve been doing lately is getting AI to give me book recommendations. I just feed it all the books I’ve read, tell it why I liked a book and ask for ideas.

We’re about to take C# to the next level! #dotnet #csharp

“dotnet run program.cs” coming in 10 thanks to @jaredpar.bsky.social and @damianedwards.com 😤😤😤🤯

As your titles get bigger you need to be conscious about the potential for the things you say to be interpreted differently by the people around you. It is very easy for what used to be off hand comments / musings to start being interpreted as setting direction or defining goals.

Got a customer bug this week that only reproduces when the number of characters generated from razor / cshtml files is an exact multiple of 40K. One of the items in the generated files is the path of the file. Needless to say, that made the bug incredibly challenging to reproduce.

if you know someone who was impacted, call them. Support them, lend them your network, your references, your referrals, and your time. This is a day with a lot of tears.

Crash dumps are a mystery novel where you are both the detective and the criminal.

If you're going to watch Murderbot on Apple TV, consider adding it to your watchlist. It's kind of like pre-ordering a book, it tells the streaming service that you're there for our show. Link for US viewers: tv.apple.com/us/show/murd... (You can also search for it on the app.)

Got a bunch of good feedback about the new URL customization features in Aspire 9.2 that I just put up a PR to address. Love it when we can make improvements like this based on user feedback. github.com/dotnet/aspir...

When writing baseline tests for floating point numbers or date times, baseline the raw binary values not the string representations. The latter is not constant and will change as frameworks and operating systems evolve.

Only wanted one thing from the Microsoft 50th Anniversary celebration and I got it

In line for the @microsoft.com 50th anniversary celebration!

How many unsafe's per module do you need before you're just writing C with a Rust compiler?

This problem exists because a lot of reasonable individual decisions combined to form evil voltron

It's that time of year again where people schedule meetings with me on April 1rst and expect me to be 100% serious in that meeting.

Official C# SDK is out! github.com/modelcontext... This wouldn't possible without the amazing community contributions of PederHP 🎉 github.com/PederHP/mcpd... The dotnet ecosystem is what is because of you all! Thank you

This is cool: FNA team has publicly released their C# NativeAOT port for Xbox, which is a pretty significant win for running C# natively on consoles. github.com/FNA-XNA/Nati...

There are two rules to plugin services avoiding memory leaks 1. If you don't write a test to validate you actually drop references to objs in the plugin system then you have a leak 2. If you write tests to validate you actually drop references to objs in the plugin system only sadness awaits you

This comment by Anders Hejlsberg on the choice of languages for TypeScript is worth reading. Spead that type of thinking! (And recognize the massive shift that Microsoft made)

they call me 007 0 lines of code 0 commits 7 open issues

But ... when do we get Rise and Fall of Sanctuary Moon???

I have been so excited since I found out this would be announced today! RIP any ability for me to concentrate: www.apple.com/tv-pr/news/2...

First preview of new Azure SDK for Rust (Cosmos DB crate coming next week): devblogs.microsoft.com/azure-sdk/ru...

There is no right way to compare paths. There is just picking the way in which you get it wrong.

Anyone had positive experiences with the "Instructions" feature of ChatGPT? I've been trying to use it to hone in the style of C# that I want generated but thus far it doesn't seem to be having any impact. Not sure if I'm missing something about how instructions are used for projects.

Hello Wednesday

My change to assembly loading now includes changing our MEF composition. This is truly exciting for me, scary for everyone reviewing the code.

I have an unhealthy obsession with assembly loading rules in .NET.

Given the gov is not going to stop the "hello hello" calls, I wish for an iPhone feature to just automatically delete all "hello hello" voicemails and remove the call from my recent history.

First time being muted in a teams meeting in 2025. Made it to 1/15. New record.

Just solved an infra issue I've been debugging all morning on why test results weren't being reported. Instead of joy though I'm just sitting here mentally screaming "why why why"

The ideal state for a file system where you're running build infrastructure is to disable file opening for write, instead it should only allow file creation for write. There is too much overwriting files in infrastructure that goes unnoticed because there are no easy defaults to stop it

Fortune cookie: your friends are delighted by your sense of humor Wife: it says "friends" not "family"

How is your day going?

Got a late Christmas present from GitHub: Close as Duplicate!!!

When catchnig up on vacation email instead of just liberally marking items as "read", take a second and ask "should I even have this email in my inbox?" If no then play around with rules to kick it out of inbox in the future.

This article nails all the usability issues around passkeys. It’s a bit of a usability mess unless you are using a single ecosystem on all devices. arstechnica.com/security/202...