トピックス
.NET 11 Preview 5 is now available! - .NET Blog
https://devblogs.microsoft.com/dotnet/dotnet-11-preview-5/
.NET and .NET Framework June 2026 servicing releases updates - .NET Blog
https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-june-2026-servicing-updates/
.NET at Microsoft Build 2026: Must watch sessions - .NET Blog
https://devblogs.microsoft.com/dotnet/dotnet-at-microsoft-build-2026/
- Azure Updates (2026-06-03) Microsoft Build 2026 Day 1 | ブチザッキ
- Microsoft Build 2026 Day 1 Keynote
- Build 2026: Furthering Windows as the trusted platform for development
Join us for .NET Day on Agentic Modernization Livestream - .NET Blog
https://devblogs.microsoft.com/dotnet/join-us-for-dotnet-day-on-agentic-modernization-livestream/
WPF Hot Reload Is Here: Edit Your XAML and Watch It Update Live in Rider | The .NET Tools Blog
https://blog.jetbrains.com/dotnet/2026/06/03/wpf-hot-reload-in-jetbrains-rider/
Rider 2026.2 EAP 5: Code Quality Checks for Your AI Agents, and More. | The .NET Tools Blog
https://blog.jetbrains.com/dotnet/2026/06/08/rider-2026-2-code-quality-check-hooks-for-ai-agents/
RESP3 and StackExchange.Redis
https://stackexchange.github.io/StackExchange.Redis/Resp3
Deprecating dotMemory Unit | The .NET Tools Blog
https://blog.jetbrains.com/dotnet/2026/05/28/deprecating-dotmemory-unit/
microsoft/microsoft-ui-reactor: Reactor is an experimental set of extensions to WinUI
https://github.com/microsoft/microsoft-ui-reactor
リリース
- App-vNext/Polly
- AvaloniaUI/Avalonia
- aws/aws-sdk-net
- Azure/azure-cosmos-dotnet-v3
- Azure/azure-sdk-for-net
- Azure.AI.Translation.Text_2.0.0, Azure.Core_1.58.0, Azure.Core_1.59.0, Azure.ResourceManager.ApplicationInsights_1.1.0, Azure.ResourceManager.AppService_1.5.0, Azure.ResourceManager.ArtifactSigning_1.0.1, Azure.ResourceManager.Avs_1.6.1, Azure.ResourceManager.Batch_1.7.0, Azure.ResourceManager.CertificateRegistration_1.0.0, Azure.ResourceManager.Compute.Recommender_1.0.0, Azure.ResourceManager.ContainerInstance_1.3.1, Azure.ResourceManager.DataBoxEdge_1.1.2, Azure.ResourceManager.Dell.Storage_1.0.1, Azure.ResourceManager.ManagedNetworkFabric_1.2.0, Azure.Security.KeyVault.Certificates_4.9.0, Azure.Storage.Blobs_12.29.0, Azure.Storage.Blobs.Batch_12.26.0, Azure.Storage.Common_12.28.0, Azure.Storage.Files.DataLake_12.27.0, Azure.Storage.Files.Shares_12.27.0, Azure.Storage.Queues_12.27.0, Microsoft.Azure.WebJobs.Extensions.WebPubSub_1.10.2, System.ClientModel_1.14.0
- CommunityToolkit/Aspire
- CommunityToolkit/Maui
- DataDog/dd-trace-dotnet
- domaindrivendev/Swashbuckle.AspNetCore
- googleapis/google-cloud-dotnet
- Google.Cloud.Bigtable.V2-3.28.0, Google.Cloud.Container.V1-3.39.0, Google.Cloud.Dataproc.V1-5.26.0, Google.Cloud.Dlp.V2-4.26.0, Google.Cloud.PubSub.V1-3.35.0, Google.Cloud.Recommender.V1-3.9.0, Google.Cloud.Security.PrivateCA.V1-3.12.0, Google.Cloud.Storage.Control.V2-1.8.0, Google.Cloud.Storage.V1-4.15.0, Google.Cloud.Workstations.V1-1.5.0
- MessagePack-CSharp/MessagePack-CSharp
- microsoft/aspire
- microsoft/WindowsAppSDK
- mysql-net/MySqlConnector
- newrelic/newrelic-dotnet-agent
- npgsql/npgsql
- open-telemetry/opentelemetry-dotnet
- spectreconsole/spectre.console
- StackExchange/StackExchange.Redis
アーティクル、スライドなど
How to open calc.exe from S&Box
https://slugcat.systems/post/26-05-21-how-to-open-calc-exe-from-sbox/
ASP.NET Core background tasks with NCronJob and SignalR
https://damienbod.com/2026/06/08/asp-net-core-background-tasks-with-ncronjob-and-signalr/
C# で Windows Service を作ってみた【1】最小構成でサービス登録とログ出力 - Qiita
https://qiita.com/Tom-Panasonic/items/fa464c139560c5274002
OR-Tools の CP-SAT で 2D パッキングを C# で解く――最適解より「使える解」をより早く
https://zenn.dev/sitio1/articles/9de31f703af95e
自作の2D物理エンジンで10000オブジェクト出せるまで最適化した話
https://zenn.dev/rubioa/articles/1eeae24d28ddb6
【Agent Hackathon】DNS変更作業をAIエージェントで証跡化する ChangeProof Agent を作った
https://zenn.dev/kaiedakensuke/articles/changeproof-agent-hackathon
[Codex実録] WinUI 3で詰まったMarkdownビューアを、Codexと一緒にWPFで作り直した話
https://zenn.dev/como/articles/article-ko-md-viewer-wpf
SqlBulkCopy を OpenTelemetry で観測したい
https://zenn.dev/xin9le/articles/ef378773820649
【C#】データ指向(ECS)なゲームエンジンの基盤を自作する
https://zenn.dev/rubioa/articles/e69f680f65dcff
iPhoneブラウザのバーコードスキャナが精度がわるくて専用アプリをつくった話② - Qiita
https://qiita.com/onigiripudding/items/0858be71d7e2ba23b87f
AWS Bedrock で GPT-5.5 を C# から使う - Qiita
https://qiita.com/karuakun/items/a73bd8bcd46d5300d318
【M5Stack】nanoFrameworkでスタックチャンを作ってみる(顔だけ) #スタックチャン - Qiita
https://qiita.com/ymd65536/items/660eee036dca7ed0a7e9
Microsoft Agent Framework の MCP-based skills を試してみる (C# v1.8.0)
https://zenn.dev/yy7613/articles/179b546688fd48
C#のasync/awaitで手続きを「巻き戻す」
https://zenn.dev/aakei/articles/async-playback
ASP.NET Coreの認証必須ページをPlaywrightでPDF化した話
https://zenn.dev/harness/articles/phycock-playwright-pdf-export
.NET Frameworkから.NETへの移行手順 - Qiita
https://qiita.com/masayasu_t/items/61dea79ba9665aa0a689
Durable Task Scheduler のダッシュボードをワンクリックで開けるようにする
https://zenn.dev/microsoft/articles/durable-task-scheduler-aspire-dashboard
【.NET 11 preview】APIの動作変更(例外型の変更)はやはり影響度が大きい(MemoryStream)
https://zenn.dev/prozolic/articles/c68acd8f201272
【C#】BinarySearchの動作に関するメモ
https://zenn.dev/someone7140/articles/9d60d6a2257b91
【C#】ReadOnlySpanTとは何か?コピーなしでメモリを読む仕組みを整理した - Qiita
https://qiita.com/nakamuuu_ow/items/f56b1e5f3f4fc43f080e
【C#/Go/PHP】配列の初期容量を指定するとどれだけ速くなるのか実測 - Qiita
https://qiita.com/simoyama2323/items/7fe670abb8ccf6b9812a
Microsoft Agent Framework の A2A プレビューで試すマルチエージェント
https://zenn.dev/yy7613/articles/c118c14f1ce9f6
.NETでレイヤー分けするとしたらどういう手段がありそうなのか?
https://zenn.dev/toripeeeeee/articles/77a45b092d9d7c
Blazor WebAssembly on Cloudflare Pages - Qiita
https://qiita.com/minerva_jupiter/items/1f2ea3310c8a6e78833a
I built a native C# Grep engine that's holding it's own with ripgrep (with zero allocations)
.NET MAUI + AdMob で iOS 実機が起動時クラッシュ:原因は iOS デプロイメントターゲットが 15 未満だった
https://zenn.dev/auctor/articles/zenn-admob-ios-crash
C#/WPF で画面端から出てくるサイドバーの作り方
https://zenn.dev/maedan/articles/433ade2bffa748
WSL 2 is getting faster Windows file system access
https://www.boxofcables.dev/wsl2-per-device-swiotlb-pools-for-virtiofs-and-virtioproxy/
ASP.NET Core アプリを Docker でマルチステージビルドするのはなぜか?
https://zenn.dev/j_sakamoto/articles/0dc4f4abdd8380
ASP.NET Core で簡単な MCPサーバーを作ってみた
https://zenn.dev/yy7613/articles/0f1ecba8352ad6
C# Networking Deep Dive with io_uring part 6 - Numbers
https://dev.to/mda2av/c-networking-deep-dive-with-iouring-part-6-numbers-49fe
【C#】.NET 10の「ファイルベース実行」で、dotnet runしただけなのにAOTエラーでクラッシュする原因と対策 - Qiita
https://qiita.com/KM_20005/items/be5229a2944df6fa3e97
【C#】コレクション式(Collection Expression)で初期化がこんなにスッキリする - Qiita
https://qiita.com/nakamuuu_ow/items/5c3e08b6f0272249802c
【超dotnet new】「個人的な目線でのdotnet-runtimeの動向」という内容で初登壇しました
https://zenn.dev/prozolic/articles/d7f518c69c182e
超dotnet new で「Aspire と GitHub Copilot の連携」というタイトルで登壇しました
https://zenn.dev/microsoft/articles/super-dotnet-new-aspire-copilot
MoonBitをC# にTranspileする
https://www.docswell.com/s/akeit0/ZQ29WV-2026-06-02-165448
C#で作るWebAssemblyランタイム
https://www.docswell.com/s/nuskey/59NR6X-super-dotnet-new
C#実装のWebAssmeblyランタイム「DotWasm」のプレビュー版を公開しました🚀
— nuskey (@nuskey8) May 28, 2026
全て純粋なC#で実装されており、GCやSIMDなどのWebAssembly 3.0相当のProposalを実装し、公式テストスイートを(ほぼ)100%パスしています!
■リポジトリhttps://t.co/XThmNHfgk0 pic.twitter.com/8QvgyxL16h
Avaloniaでデスクトップ開発、もっとやってもいいんじゃない?
https://speakerdeck.com/mogamit/avaloniadedesukutotupukai-fa-motutoyatutemoiinziyanai
.NET for Android with Native AOT Built with Cursor
https://speakerdeck.com/neuecc/dot-net-for-android-with-native-aot-built-with-cursor
Roslyn でフロー解析してみる
https://speakerdeck.com/ruccho/flow-analysis-with-roslyn
GitHub Copilot CLIでWebアクセシビリティを改善した話
https://speakerdeck.com/tomokusaba/github-copilot-clidewebakusesibiriteiwogai-shan-sitahua
AIとASP.NET Coreで雑Webアプリを作った話
https://speakerdeck.com/mayuki/build-your-own-apps-with-ai-20260529-dotnetnew
C#とC#をinteropする(しない)
ツイート
TIL https://t.co/Oi99TNhw5a. Good for mono repos.
— David Fowler (@davidfowl) June 9, 2026
in .NET 11.0 we've landed many changes in JIT (applies to NAOT too) to optimize redundant bound checks to make safe code as fast as unsafe (can be tracked via reduce-unsafe label https://t.co/LmGsXEYrPJ). Example: https://t.co/K0F2dZZe4j pic.twitter.com/Tuk70cH8Ux
— EgorBo (@EgorBo) June 3, 2026
In the latest daily builds of the #dotnet CLI, the bundled tools dotnet-user-secrets, dotnet-user-jwts, & dotnet-dev-certs are now native AOT published! This is part of wider work to start native AOT'ing parts of the dotnet CLI to improve startup performance. pic.twitter.com/0DIFVzfkuA
— Damian Edwards (@DamianEdwards) June 1, 2026
What's better than writing a book about GC? Writing a GC! I am excited to share that I've joined Microsoft as Principal Software Engineer, to work on the evolution of the .NET Garbage Collector and in general the future of the .NET runtime. Stay tuned for much more!
— Konrad Kokosa (@konradkokosa) June 1, 2026
After my… pic.twitter.com/9WtoprUWn8
.NET Foundation Newsletter | May 2026 - https://t.co/mZnnEUKzuJ
— .NET Foundation (@dotnetfdn) May 31, 2026
Coming to C# file-based apps (FBAs) in .NET 11:
— Damian Edwards (@DamianEdwards) May 28, 2026
- transitive directives, i.e. honor directives from #:include'd files
- #:include ../libs/Assembly.dll
- `#:ref app.cs` for references between FBAs (useful for tests, class libs, etc.)