トピックス
Visual Studio February Update - Visual Studio Blog
https://devblogs.microsoft.com/visualstudio/visual-studio-february-update/
📢 DEPRECATION ANNOUNCEMENT: Polyglot Notebooks · Issue #4163 · dotnet/interactive
https://github.com/dotnet/interactive/issues/4163
Custom Agents in Visual Studio: Built in and Build-Your-Own agents - Visual Studio Blog
Avalonia 12.0 Preview 1 - Avalonia UI
https://avaloniaui.net/blog/avalonia-12.0-preview-1
リリース
- aws/aws-sdk-net
- Azure/azure-cosmos-dotnet-v3
- Azure/azure-sdk-for-net
- CommunityToolkit/Maui
- DataDog/dd-trace-dotnet
- domaindrivendev/Swashbuckle.AspNetCore
- dotnet/aspire
- dotnet/maui
- googleapis/google-cloud-dotnet
- open-telemetry/opentelemetry-dotnet-contrib
- StackExchange/StackExchange.Redis
アーティクル、スライドなど
Readonly vs Immutable vs Frozen in C#: differences and (a lot of) benchmarks
https://www.code4it.dev/blog/readonly-vs-immutable-vs-frozen/
Blazorのデータフローとコンポーネント連携
https://zenn.dev/nexta_/articles/blazor-databinding
RE#: how we built the world's fastest regex engine in F# | ian erik varatalu
https://iev.ee/blog/resharp-how-we-built-the-fastest-regex-in-fsharp/
【C#】C#でPlaywrightのテストを実施 - Qiita
https://qiita.com/KM_20005/items/f14b44d73b173891c4be
WinFormsでPaSoRi RC-S300とNTAG 215 NFCカード読み込ませる - Qiita
https://qiita.com/maki_s/items/928649dcaed7b6b20f54
Recording metrics in-process using MeterListener: System.Diagnostics.Metrics APIs - Part 4
https://andrewlock.net/recording-metrics-in-process-using-meterlistener/
Vector Data in .NET - Building Blocks for AI Part 2 - .NET Blog
https://devblogs.microsoft.com/dotnet/vector-data-in-dotnet-building-blocks-for-ai-part-2/
C#における Unit of Work 研究ノート：歴史から現代の実装まで
https://zenn.dev/rendya/articles/csharp-unit-of-work-pattern-history-to-modern
Auto-Discovering A2A Agents in Kubernetes - K8sによるAIエージェントのディスカバリ
https://zenn.dev/ymd65536/articles/a2a_agent_dispatcher_dotnet_k8s
Writing a native VLC plugin in C#
https://mfkl.github.io/2026/02/11/vlc-plugin-csharp.html
Laurent Kempé - Exploring .NET 11 Preview 1 Runtime Async: A dive into the Future of Async in .NET
依存関係プロパティーとバインドの探求
https://zenn.dev/shinta0806/articles/dependency-property
Blazorのレンダリングの仕組みとコンポーネントのライフサイクル
https://zenn.dev/nexta_/articles/blazor-component-lifecycle
【.NET 11 Preview 1】Zstandard 圧縮
https://zenn.dev/prozolic/articles/3830231a430b42
Stainless - Blog - Sharper than ever: the Stainless C# SDK generator is now generally available
Creating standard and "observable" instruments: System.Diagnostics.Metrics APIs - Part 3
https://andrewlock.net/creating-standard-and-observable-instruments/
Fluent UI Blazor v5 RC1がリリース！v4からの進化と新機能を徹底解説
https://zenn.dev/tomokusaba/articles/29e7615e6ff4ae
The Dongle Died at Midnight – WinForms Agent Saved my German Mom's Business Trip - .NET Blog
https://devblogs.microsoft.com/dotnet/the-dongle-died-at-midnight/
.NET10でORMをベンチマークしてみた。(リベンジ)
https://zenn.dev/neko3cs/articles/dotnet-benchmark-orm-revenge
プログラミング言語オタクとして改めてC#を語りたい
https://zenn.dev/nuskey/articles/why-i-use-csharp
Too good to be true: an unexpected profiler trap
https://minidump.net/an-unexpected-profiler-trap/
What's new for the Microsoft Fluent UI Blazor library 5.0 RC1
https://baaijte.net/blog/microsoft-fluentui-aspnetcore.components-50-rc1/
Microsoft .NET On Linux Patches Use IO_uring For Massive Performance Benefits
https://www.phoronix.com/news/Microsoft-dotNET-IO-uring
ライブラリ、リポジトリ、ツールなど
joe-gregory/blazor-devtools
https://github.com/joe-gregory/blazor-devtools
arika0093/console2svg: Easily convert terminal output into SVG images. Colorful, animated, with cropping and window frame options.
https://github.com/arika0093/Console2Svg
Blazor Blueprint - Beautiful UI Components for Blazor
https://blazorblueprintui.com/
Cysharp/SerializerFoundation: High performance serialization infrastructure for C#.
https://github.com/Cysharp/SerializerFoundation
Scratch Files - Visual Studio Marketplace
https://marketplace.visualstudio.com/items?itemName=MadsKristensen.ScratchFiles
Make it super-fast to create new files in VS (Ctrl+N) without choosing a template and have them persist at scratch location globally on per solution. Or simply just delete them when done.
— Mads Kristensen (@mkristensen) February 24, 2026
Try it out!https://t.co/VYknxmPnIx
Azure Explorer - Visual Studio Marketplace
https://marketplace.visualstudio.com/items?itemName=MadsKristensen.AzureExplorer
Access your Azure resources directly inside Visual Studio. Copy connection strings, add and read Key Vault secrets, real-time log streaming, access the remote file system, and a lot more.https://t.co/I4DJaNGPyX pic.twitter.com/9PcmCLn5Su
— Mads Kristensen (@mkristensen) February 19, 2026
ツイート
そういや lang=C# 有効化されてた。
— ++C++; // 管理人: 岩永 (@ufcpp) February 24, 2026
(ちょっと前まで lang=C#-test と書く必要があった。) pic.twitter.com/sLb3FUGyam
https://t.co/DqlscJPIMs
— ++C++; // 管理人: 岩永 (@ufcpp) February 25, 2026
.NET の日付Parseはヒューリスティックな実装が過ぎるので使うの怖いとは聞くけどもここまでやってるのねぇ。特に初期WindowsのCJK特別扱いが今でも影響残ってる。
I'm a bit surprised that "dotnet tool install --global" uses the local nuget config, if any.
— Kevin Gosse (@KooKiz) February 23, 2026
For local tools, I get it. For global tools, I would expect it to always use the userprofile config. Sounds a bit dangerous? Like, if you run the command from your Downloads or temp… pic.twitter.com/iBN01DzDUY
You can use this extension to easily pull agents from the Awesome-Copilot repo into your solution https://t.co/jwVb8ygqg0
— Mads Kristensen (@mkristensen) February 19, 2026