トピックス
.NET and .NET Framework October 2026 servicing releases updates - .NET Blog
https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-october-2026-servicing-updates/
Introducing dotnetup: A toolchain manager for .NET - .NET Blog
https://devblogs.microsoft.com/dotnet/introducing-dotnetup/
Announcing .NET 11 Release Candidate 2 - .NET Blog
https://devblogs.microsoft.com/dotnet/dotnet-11-rc-2/
Microsoft.UI.Reactor: a C#-first way to build WinUI apps - #ifdef Windows
https://devblogs.microsoft.com/ifdef-windows/microsoft-ui-reactor-a-c-first-way-to-build-winui-apps/
JetBrains .NET Day Online 2026: Watch the Recordings - The JetBrains Blog
https://blog.jetbrains.com/dotnet/2026/10/19/jetbrains-dotnet-day-online-2026-watch-the-recordings/
Get Your .NET MAUI App Ready for Xcode 27 - .NET Blog
https://devblogs.microsoft.com/dotnet/migrate-dotnet-maui-apps-uikit-scene-lifecycle/
WinUI Gallery 3.0 is here: TableView, Charts, InkCanvas and more - #ifdef Windows
リリース
アーティクル、スライドなど
Compare today's code with an earlier commit - Visual Studio Blog
https://devblogs.microsoft.com/visualstudio/compare-todays-code-with-an-earlier-commit/
FlaUI + Claude Code で「手順をコードに書かない」WPF の UI テストをやってみた - Qiita
https://qiita.com/hatsukaze/items/367a2e07a94ea7dcf696
An introduction to Compact Binary Object Representation (CBOR) in .NET
https://andrewlock.net/an-introduction-to-compact-binary-object-notation-in-dotnet/
Avaloniaでトレイアイコンが透明になる不具合に3ヶ月悩まされた話（v12.1.3で解決）
https://zenn.dev/chililikobo/articles/64a8f2b03f0df4
Simplifying NAudio 3 Target Frameworks
https://markheath.net/post/2026/10/18/simplifying-naudio-3-tfms
Bring Your Own Model to the GitHub Copilot SDK with C# - .NET Blog
https://devblogs.microsoft.com/dotnet/bring-your-own-model-to-the-github-copilot-sdk-with-csharp/
Organize and revisit tabs with the keyboard - Visual Studio Blog
https://devblogs.microsoft.com/visualstudio/organize-and-revisit-tabs-with-the-keyboard/
Windowsのキーボード・マウスをiPadで使う「Universal Bridge」：BLE HIDの実装と使い方 - Qiita
https://qiita.com/tukiharu/items/8d5f16e82816d8fc9eb4
C# (Native AOT) アプリの通知機能設計：OAuth 2.0 対応メール送信を諦めて ntfy.sh を選んだ知見
https://zenn.dev/chililikobo/articles/dbd029de91c457
C#デスクトップアプリにメール通知を実装しようとしてOAuth2.0の壁に阻まれ、ntfy.shに救われた話 - Qiita
https://qiita.com/chililikobo/items/2d88453888a2549cd38e
ASP.NET CoreとSource Generatorでポリシーベースの権限管理を楽に実装できるようにしてみた - Qiita
https://qiita.com/omt_teruki/items/27f7bacee43205e28f11
Embedding Gemma 2 を C# から使用してマルチモーダル対応の検索アプリを作る
https://zenn.dev/sora_kumo/articles/embedding-gemma-2-onnx
【.NET】シフト演算子のシフト数の挙動
https://zenn.dev/prozolic/articles/e1e0429c1bec2a
Enable Satori GC in .NET with Just a Single Line
https://medium.com/@skyake/enable-satori-gc-in-net-with-just-a-single-line-bdff4a65f5c9
What will new developers do when AI writes the code?
https://commandline.microsoft.com/praise-preceptor-ai-accelerated-software-engineering-cmu/
Trivyをお手軽に導入できるか調べた話
https://zenn.dev/sitio1/articles/5261292709f7c4
.NET と React で航空会社経営ゲームを個人開発した話
https://zenn.dev/airlengend/articles/c93e0324402acf
Stop waiting on a failed build - Visual Studio Blog
https://devblogs.microsoft.com/visualstudio/stop-waiting-on-a-failed-build/
RAMディスクでWindowsを高速化するアプリを作って困ったこと
https://zenn.dev/da39nbv3/articles/1dcacffdcee69b
New Tools, New Workflows and the Value of the Visual Studio Subscription: What We Learned at VSLive! San Diego - Visual Studio Blog
Durable Task in the Real World: What Problems Does It Actually Solve? - .NET Blog
https://devblogs.microsoft.com/dotnet/durable-task-in-the-real-world/
dotFly - a fruit fly's brain, simulated in C# | Konrad 'Dev Nerd' Kokosa
https://kokosa.dev/blog/2026/dotfly/
I Retired My Hue Bridge. Here's How I Rebuilt Everything It Did (and More) in C#
C vs C#: racing VLC's Gaussian blur - Martin Finkel
https://martinfinkel.com/blog/gaussian-blur-c-vs-csharp/
ライブラリ、リポジトリ、ツールなど
opencode-dotnet/opencode-sdk-dotnet
https://github.com/opencode-dotnet/opencode-sdk-dotnet
ツイート
cloudflare-workers-dotnet v0.3 リリースしました！
— 何縫ねの。 (@nenoMake) October 13, 2026
HttpClient が普通に使えるようになりました！https://t.co/tXYgGyfN31