トピックス
.NET and .NET Framework March 2026 servicing releases updates - .NET Blog
https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-march-2026-servicing-updates/
.NET 11 Preview 2 is now available! - .NET Blog
https://devblogs.microsoft.com/dotnet/dotnet-11-preview-2/
ReSharper for Visual Studio Code, Cursor, and Compatible Editors Is Out | The .NET Tools Blog
MAUI Avalonia Preview 1 - Avalonia UI
https://avaloniaui.net/blog/maui-avalonia-preview-1
Extend your coding agent with .NET Skills - .NET Blog
https://devblogs.microsoft.com/dotnet/extend-your-coding-agent-with-dotnet-skills/
Release v1.0 of the official MCP C# SDK - .NET Blog
https://devblogs.microsoft.com/dotnet/release-v10-of-the-official-mcp-csharp-sdk/
Announcing WinUI Gallery 2.8 - #ifdef Windows
https://devblogs.microsoft.com/ifdef-windows/announcing-winui-gallery-2-8/
Microsoft.Data.SqlClient 7.0 Preview: Finally, Azure.Identity is Optional! 🎉
https://erikej.github.io/sqlclient/dotnet/2026/03/06/dotnet-sqlClient-7.html
CoreCLR, Scripting, and ECS Status Update - March 2026 - Unity Engine - Unity Discussions
https://discussions.unity.com/t/coreclr-scripting-and-ecs-status-update-march-2026/1711852
Feedback required: drop .NET Framework support in Microsoft.Data.Sqlite · Issue #37895 · dotnet/efcore
https://github.com/dotnet/efcore/issues/37895
Modernize .NET Anywhere with GitHub Copilot - .NET Blog
https://devblogs.microsoft.com/dotnet/modernize-dotnet-anywhere-with-ghcp/
Aspire Conf — March 23, 9:00a PT
https://aspire.dev/aspireconf/
Microsoft Build, June 2-3, 2026 / San Francisco and online
https://build.microsoft.com/en-US/home
リリース
- aws/aws-sdk-net
- Azure/azure-cosmos-dotnet-v3
- Azure/azure-sdk-for-net
- Azure.AI.ContentUnderstanding_1.0.1, Azure.AI.ContentUnderstanding_1.0.2, Azure.Identity_1.19.0, Azure.Provisioning_1.5.0, Azure.Provisioning.AppContainers_1.2.0, Azure.Provisioning.Network_1.0.0, Azure.ResourceManager.DisconnectedOperations_1.0.0, Azure.ResourceManager.DurableTask_1.1.0, Azure.ResourceManager.NetApp_1.15.0, Azure.ResourceManager.ServiceFabricManagedClusters_1.3.0, Azure.ResourceManager.Storage_1.6.1
- DataDog/dd-trace-dotnet
- domaindrivendev/Swashbuckle.AspNetCore
- dotnet/dotnet-monitor
- googleapis/google-cloud-dotnet
- Google.Cloud.AIPlatform.V1-3.67.0, Google.Cloud.AlloyDb.V1-1.14.0, Google.Cloud.Compute.V1-3.25.0, Google.Cloud.Compute.V1-3.26.0, Google.Cloud.Dataplex.V1-3.13.0, Google.Cloud.DevTools.ContainerAnalysis-3.15.0, Google.Cloud.DocumentAI.V1-3.24.0, Google.Cloud.Firestore-4.2.0, Google.Cloud.Iap.V1-2.10.0, Google.Cloud.PubSub.V1-3.33.0, Google.Maps.Routing.V2-1.2.0, Google.Shopping.Merchant.Products.V1-1.4.0, Google.Shopping.Type-1.1.0
- microsoft/WindowsAppSDK
- npgsql/npgsql
- open-telemetry/opentelemetry-dotnet-contrib
- StackExchange/StackExchange.Redis
アーティクル、スライドなど
Get the Inside Scoop on Visual Studio Subscriptions, Straight to Your Inbox - Visual Studio Blog
https://devblogs.microsoft.com/visualstudio/vss-newsletter-opt-in/
【C#中級者向け】コレクションで capacity 指定してる?
https://zenn.dev/snak_dev/articles/0823a1f24ada92
AWS Lambdaで.NET 8から.NET 10に移行したときにやったこと - Qiita
https://qiita.com/kaz-matsubara/items/83d512c004fc919fff15
Offlining a Live Game With .NET Native AOT
https://sephnewman.substack.com/p/offlining-a-live-game-with-net-native
【C#】派生クラスでは基底クラスのイベントは発火できないという備忘録
https://zenn.dev/luxiar/articles/9ba0cc8961d390
BlazorコンポーネントをbUnitでテストする
https://zenn.dev/nexta_/articles/blazor-bunit-testing
ReactiveProperty のバリデーションを正しく扱うための基礎と実践 - Qiita
https://qiita.com/wiskerpaddy/items/dfc71a6cbb435630e398
無料&オフラインで音声をテキスト変換(Whisper, Vosk) - Qiita
https://qiita.com/kansou/items/23ac568ef8512a691e1d
Moq から NSubstitute への乗り換えガイド - modest violet
C#モックライブラリ2026年版 ― NSubstituteで始めるユニットテスト入門
https://zenn.dev/shin21/articles/moq-to-nsubstitute
F# を触って思うこと - Qiita
https://qiita.com/Yosh31207/items/3c42b9210382127dcb9d
【C#】CA1822「staticにマークできます」は従うべきか?つけるべきケースとそうでないケースを整理した - Qiita
https://qiita.com/nakamuuu_ow/items/d69ce0aebaa97c9e4000
C#シニアエンジニアが TypeScript (Next.js) を学んで戸惑ったこと・納得したこと - Qiita
https://qiita.com/HakamataSoft/items/6fd36e4801ee37d0f11e
お金がないので Azure App Service の性能をローカル Docker でできるだけ再現したい
https://zenn.dev/au/articles/2e0dc158b91a86
OracleB2C(RightNow)をC#からSOAPアクセス
https://zenn.dev/yakumo3/articles/eb6c1ac2335e73
GitHub Copilot SDK を軸に Copilot Cowork を作る理由を整理した話
https://zenn.dev/jodycraft/articles/copilot-cowork-01-survey
.NET開発で考える Claude Codeを使ったテスト戦略
https://zenn.dev/au/articles/4c469a87814dd2
Voice Live API プレビュー版(2026-01-01-preview)の新機能を試す ― Foundry Agent Tool / Filler Response / Echo Cancellation - Qiita
https://qiita.com/miyaura/items/002997103806f7fa531d
C#のログ、まだlogger.Log~で書いてるの?
https://zenn.dev/snak_dev/articles/da22b564722be9
【C#】.NET Aspire + YARP で 404 エラー。サービスディスカバリを有効にする正しい HttpClient の扱い方 - Qiita
https://qiita.com/KM_20005/items/f23396073c5e46ee9794
Splitting the NetEscapades.EnumGenerators packages: the road to a stable release
Satori GC - 高スループット・低レイテンシ・低メモリ使用量を同時に狙う - Qiita
https://qiita.com/hez2010/items/2f5397c90ba169283e9a
Visual Studio Dev Essentials: Free, Practical Tools for Every Developer - Visual Studio Blog
【C#】constとstatic readonlyは何が違うの?使い分けが気になったので調べてみた - Qiita
https://qiita.com/nakamuuu_ow/items/b30125d405b37f4b06e5
【C#】「Charts for BenchmarkDotNet」が便利で見やすい
https://zenn.dev/inuinu/articles/chart-benchmark-dotnet
Microsoft Agent Framework の AIContextProvider でツールの遅延読み込みを実装する
https://zenn.dev/microsoft/articles/agent-framework-dynamictools
dotnetでマルチプラットフォーム向けにNativeAOT発行する
https://zenn.dev/arika/articles/20260306-os-arch-in-release
SourceGeneratorのマーカー属性問題について
https://zenn.dev/poipoionigiri/articles/c3e7b46e3f0b0e
【C#】Blazing Storyを試してみた - Qiita
https://qiita.com/KM_20005/items/93ce32ad71dc0039c47d
C#でWindows.Graphics.Captureウィンドウキャプチャ
https://zenn.dev/radian_jp/articles/03271d5b1f778e
.NET: CopyToAsync vs WriteAsync: The Benchmark You Didn’t Know You Needed
https://dev.to/gramli/net-copytoasync-vs-writeasync-the-benchmark-you-didnt-know-you-needed-1g39
WinUI3でC#とC++/WinRTが混ざったプロジェクトを自己完結のデスクトップアプリとして発行する
https://zenn.dev/tokonatsu/articles/bf1f36a50cc87a
C# DevKitは完全無料じゃないし、Riderは非商用無料:なぜか広がるC#開発環境の誤情報
https://zenn.dev/inuinu/articles/devkit-is-not-free-and-rider-is-free
【小ネタ】BenchmarkDotNetの結果をSpectre.Consoleでちょっとリッチに表示する!
https://zenn.dev/prozolic/articles/1b9f58ea69e2ab
「マクロ欲しい」→「Source Generator 使え」→「むずい」→「ほら、作ったよ」
https://ufcpp.net/blog/2026/3/sourcegeneratordemo/
「マクロ欲しい」→「Source Generator 使え」→「大変。プロジェクト分かれるのがきつい。同じプロジェクト内にテンプレート書きたい」→「属性使った Source Generator を最初に1個だけ書けばいいじゃない」→「簡単とかいうなら実物あるんかい」→「今書いたわ」https://t.co/EyCoe01Xrm
— ++C++; // 管理人: 岩永 (@ufcpp) March 4, 2026
Writing a .NET Garbage Collector in C# - Part 8: Interior pointers
https://minidump.net/writing-a-net-gc-in-c-part-8/
【.NET】BenchmarkDotNetの各設定の出力内容の違い(備忘録)
https://zenn.dev/prozolic/articles/ef20ad02d17a84
Directory.Build.propsで指定したPackageReferenceをプロジェクトファイルで上書きする - tech.guitarrapc.cóm
https://tech.guitarrapc.com/entry/2026/03/04/230000
ライブラリ、リポジトリ、ツールなど
gragra33/Blazing.Mvvm: 🔥 Blazing.Mvvm - Full MVVM support for Blazor with CommunityToolkit.Mvvm integration. Supports all hosting models (Server, WASM, SSR, Auto, Hybrid, MAUI). Features strongly-typed navigation, automatic ViewModel registration, parameter resolution, validation support, and comprehensive lifecycle management. Includes samples and full documentation.
https://github.com/gragra33/Blazing.Mvvm
actbit/MaskedUUID
https://github.com/actbit/MaskedUUID
nickprotop/ConsoleEx: SharpConsoleUI — A .NET 8+ console windowing system with overlapping windows, 30+ controls, embedded terminal emulator, canvas drawing, and async per-window threads.
https://github.com/nickprotop/ConsoleEx
KumikoUI - A Free, Open-Source DataGrid for MAUI
https://www.ston.is/blog/maui/kumiko-ui/
Codex - Windows に無料でダウンロードしてインストールする | Microsoft Store
https://apps.microsoft.com/detail/9plm9xgg6vks?hl=ja-JP&gl=JP
Want to emphasize that @OpenAI Codex is the only coding agent with a Windows-native sandbox.
— Derrick Choi (@derrickcchoi) March 6, 2026
The sandbox is OS-level and uses Windows security primitives (restricted tokens, ACL boundaries, dedicated sandbox users).
No WSL2 needed. Runs as a native Windows process in the same…
The Codex app is now live on Windows.
— Andrew Ambrosino (@ajambrosino) March 4, 2026
The app runs both natively and in WSL, with integrated terminals for PowerShell, Command Prompt, Git Bash, or WSL.
We also built the first Windows-native agent sandbox — using OS-level controls to block filesystem writes outside your… pic.twitter.com/t7tQRvf3ft
Tomlyn
https://xoofx.github.io/Tomlyn/
Another old project of mine, Tomlyn, just got a major refresh with the 1.0 release: https://t.co/AJtmxVbQzB - a solid, modern foundation for working with TOML in .NET.
— Alexandre Mutel (@xoofx) March 4, 2026
ツイート
We merged an early C# 15 preview feature into .NET 11 preview 3: unions.
— Julien Couvreur (@jcouv) March 7, 2026
Adds union declarations (`union Pet(Cat, Dog, Bird) { ... }`) and union types (attributed with `[Union]`).
They can be treated by pattern matching/switch expressions as a closed set for exhaustiveness.
GPT-5.4 is now also available in Visual Studio 2022/2026 https://t.co/yz7NlGWdUw
— Mads Kristensen (@mkristensen) March 6, 2026