Merge pull request #214 from mayuki/2026-04-21

Add 2026-04-21.md

Author: mayuki

input/2026/2026-04-21.md

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+---
+Title: "2026-04-21: .NET 11 Preview 3, .NET 10.0.6 & 9.0.15 & 8.0.26, Microsoft Agent Framework 1.0, The Road to Visual Studio 2027"
+Published: 2026/04/21 00:00
+DestinationPath: 2026/04/21/updates.html
+---
+<!--
+# yyyy-MM-dd
+## 主なトピックス
+## ヘッドライン
+## アーティクル、スライドなど
+## ライブラリ、リポジトリ、ツールなど
+## サイト、ドキュメントなど
+### ツイート
+## Deep Dive
+-->
+
+## トピックス
+
+### .NET 11 Preview 3 is now available! - .NET Blog
+https://devblogs.microsoft.com/dotnet/dotnet-11-preview-3/
+
+### .NET and .NET Framework April 2026 servicing releases updates - .NET Blog
+https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-april-2026-servicing-updates/
+
+### Microsoft Agent Framework Version 1.0 | Microsoft Agent Framework
+https://devblogs.microsoft.com/agent-framework/microsoft-agent-framework-version-1-0/
+
+### Keynote: The Road to Visual Studio 2027: Building a Faster, Smarter IDE | VS Live! Las Vegas 2026
+https://www.youtube.com/watch?v=fVE4Ol085UU
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/fVE4Ol085UU?si=HUo0tyEf893bmzb2" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+
+- [From AI to .NET: 20 VS Live! Las Vegas Sessions You Can Watch Now - Visual Studio Blog](https://devblogs.microsoft.com/visualstudio/from-ai-to-net-20-vs-live-las-vegas-sessions-you-can-watch-now/)
+
+### Writing Node.js addons with .NET Native AOT - .NET Blog
+https://devblogs.microsoft.com/dotnet/writing-nodejs-addons-with-dotnet-native-aot/
+
+
+### CRITICAL BREAKING CHANGE in Microsoft.AspNetCore.DataProtection from 10.0.5 = 10.0.6 · Issue #66335 · dotnet/aspnetcore
+https://github.com/dotnet/aspnetcore/issues/66335
+
+## リリース
+- [AvaloniaUI/Avalonia](https://github.com/AvaloniaUI/Avalonia)
+    - [11.3.14](https://github.com/AvaloniaUI/Avalonia/releases/tag/11.3.14), [12.0.1](https://github.com/AvaloniaUI/Avalonia/releases/tag/12.0.1)
+- [aws/aws-sdk-net](https://github.com/aws/aws-sdk-net)
+    - [4.0.230.0](https://github.com/aws/aws-sdk-net/releases/tag/4.0.230.0), [4.0.231.0](https://github.com/aws/aws-sdk-net/releases/tag/4.0.231.0), [4.0.232.0](https://github.com/aws/aws-sdk-net/releases/tag/4.0.232.0), [4.0.233.0](https://github.com/aws/aws-sdk-net/releases/tag/4.0.233.0), [4.0.234.0](https://github.com/aws/aws-sdk-net/releases/tag/4.0.234.0)
+- [Azure/azure-sdk-for-net](https://github.com/Azure/azure-sdk-for-net)
+    - [Azure.Core_1.53.0](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.Core_1.53.0), [Azure.Identity_1.17.2](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.Identity_1.17.2), [Azure.Identity.Broker_1.6.0](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.Identity.Broker_1.6.0), [Azure.Provisioning.Network_1.1.0](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.Provisioning.Network_1.1.0), [Azure.ResourceManager.AlertsManagement_1.1.2](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.ResourceManager.AlertsManagement_1.1.2), [Azure.ResourceManager.Analysis_1.1.2](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.ResourceManager.Analysis_1.1.2), [Azure.ResourceManager.ApiManagement_1.3.1](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.ResourceManager.ApiManagement_1.3.1), [Azure.ResourceManager.AppComplianceAutomation_1.0.2](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.ResourceManager.AppComplianceAutomation_1.0.2), [Azure.ResourceManager.ArizeAIObservabilityEval_1.0.1](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.ResourceManager.ArizeAIObservabilityEval_1.0.1), [Azure.Security.KeyVault.Secrets_4.10.0](https://github.com/Azure/azure-sdk-for-net/releases/tag/Azure.Security.KeyVault.Secrets_4.10.0)
+- [DataDog/dd-trace-dotnet](https://github.com/DataDog/dd-trace-dotnet)
+    - [v3.42.0](https://github.com/DataDog/dd-trace-dotnet/releases/tag/v3.42.0)
+- [dotnet/dotnet-monitor](https://github.com/dotnet/dotnet-monitor)
+    - [v10.0.2](https://github.com/dotnet/dotnet-monitor/releases/tag/v10.0.2)
+- [dotnet/orleans](https://github.com/dotnet/orleans)
+    - [v10.1.0](https://github.com/dotnet/orleans/releases/tag/v10.1.0)
+- [googleapis/google-cloud-dotnet](https://github.com/googleapis/google-cloud-dotnet)
+    - [Google.Cloud.Dataproc.V1-5.24.0](https://github.com/googleapis/google-cloud-dotnet/releases/tag/Google.Cloud.Dataproc.V1-5.24.0), [Google.Cloud.Kms.V1-3.24.0](https://github.com/googleapis/google-cloud-dotnet/releases/tag/Google.Cloud.Kms.V1-3.24.0), [Google.Cloud.Translate.V3-3.11.0](https://github.com/googleapis/google-cloud-dotnet/releases/tag/Google.Cloud.Translate.V3-3.11.0), [Google.Shopping.Merchant.Inventories.V1-1.3.0](https://github.com/googleapis/google-cloud-dotnet/releases/tag/Google.Shopping.Merchant.Inventories.V1-1.3.0), [Google.Shopping.Merchant.Products.V1-1.5.0](https://github.com/googleapis/google-cloud-dotnet/releases/tag/Google.Shopping.Merchant.Products.V1-1.5.0)
+- [microsoft/CsWin32](https://github.com/microsoft/CsWin32)
+    - [v0.3.275](https://github.com/microsoft/CsWin32/releases/tag/v0.3.275)
+- [spectreconsole/spectre.console](https://github.com/spectreconsole/spectre.console)
+    - [0.55.1](https://github.com/spectreconsole/spectre.console/releases/tag/0.55.1), [0.55.2](https://github.com/spectreconsole/spectre.console/releases/tag/0.55.2)
+
+## アーティクル、スライドなど
+
+### Microsoft Agent FrameworkをローカルLLMで試してみる その8(ChatHistoryProvider)
+https://zenn.dev/yy7613/articles/af540163a106c9
+- [Microsoft Agent FrameworkをローカルLLMで試してみる その9(AIContextProvider)](https://zenn.dev/yy7613/articles/4d03bf8c93b13c)
+- [Microsoft Agent FrameworkをローカルLLMで試してみる その10(AIContextProvider)](https://zenn.dev/yy7613/articles/57ceb544ff7486)
+
+### Revisiting C# Scripting with the Westwind.Scripting Templating Library, Part 1
+https://weblog.west-wind.com/posts/2026/Apr/20/Revisiting-C-Scripting-with-the-WestwindScripting-Templating-Library-Part-1
+
+### C# 15：Union Types 完全ガイド - Qiita
+https://qiita.com/hez2010/items/b656c867f9e5f57cc1cd
+
+### KafkaとMassTransitを触って気づいた、イベント駆動の本質は「配送」ではなく「データの扱い」だった話
+https://zenn.dev/aecomet/articles/fa61ba2aa5d583
+
+### テスト用S3モックサーバーが欲しくなったら、今ならAIに作ってもらえばよいのかも - Qiita
+https://qiita.com/yamaokunousausa/items/4547756cc171d7709596
+
+### C#15.0を試すためにDev Containersを使う【VSCode】
+https://zenn.dev/inuinu/articles/csharp15-with-dev-container
+
+### GitHub Copilot CLI でスキルを駆使していい感じのプログラムを書いてもらおう
+https://zenn.dev/microsoft/articles/github-copilot-create-agents
+
+### Claude Codeのレート制限をUSB LCDに表示してみた・許可プロンプトをPATLITE(偽)で通知してみた - Qiita
+https://qiita.com/yamaokunousausa/items/8ee2d8dc607483ce7679
+
+### Porting a SwiftUI App to Avalonia: How does Cross-Platform .NET hold up
+https://dev.to/biozal/porting-a-swiftui-app-to-avalonia-how-does-cross-platform-net-hold-up-4ol0
+
+### Any CPU - x64移行でハマった：InstallUtil.exeは同じアーキテクチャで実行する必要がある
+https://zenn.dev/luxiar/articles/1a5fa7127b0d18
+
+### The Road to Visual Studio 2027 - NDepend Blog
+https://blog.ndepend.com/the-road-to-visual-studio-2027/
+
+### 非エンジニアでもできるC# WinForms入門 — 製造業の社内ツールを自分で作る
+https://zenn.dev/jodycraft/articles/csharp-winforms-for-non-engineers
+
+### 【.NET】境界チェックが消えるパターン集
+https://zenn.dev/prozolic/articles/79df5e08acf4b5
+
+### 【.NET MAUI】はじめてのアプリ開発！BMI計算アプリを作ってみよう - Qiita
+https://qiita.com/Satoshi_Katsu/items/2748e8d423138b95d829
+
+### Building a GPT From Scratch in C# | Gary Jackson
+https://garyjackson.dev/gpt-course/
+
+### Introduction | Gary Jackson
+https://garyjackson.dev/gpt-course/introduction/
+
+### C# That Looks Like Go: Building a Web API Without a .csproj
+https://makarchie.com/posts/csharp-that-looks-like-go-file-based-apps/
+
+### GitHub Copilot クラウドエージェントで Aspire を起動できるようにする
+https://zenn.dev/mayuki/articles/a8a9f64100e46d
+
+### アプリが起動しないのにログが出ない...を解決する「Bootstrap Logger」のススメ - Qiita
+https://qiita.com/futayubi5656/items/dcbe02d506f02855fd8b
+
+### IAsyncEnumerable を DTO のプロパティに置くと EF Core が並列実行エラーになる仕組みと解決方法
+https://zenn.dev/juners/articles/288efc07eb5794
+
+### C# PDF生成ライブラリ比較 — PDFSharp vs QuestPDFを検査成績書で実装して選び方を考えた
+https://zenn.dev/jodycraft/articles/csharp-pdf-pdfsharp-vs-questpdf
+
+### Microsoft Foundry Localをお試しする(C#編その１) - Qiita
+https://qiita.com/kashin777/items/0878a6f2c1412402d065
+
+### データ型のメンバーが増える度にあちこち修正しないためのLINQ
+https://zenn.dev/numani/articles/extract-shape
+
+### TestContainersとPodmanでEFCoreを使った.NETアプリケーションの統合テストを実装する
+https://zenn.dev/ryun_log/articles/8a9bfd0740d0e5
+
+### 【Azure】Microsoft Entra ID ユーザー管理と Blazor 権限制御の実装ガイド - Qiita
+https://qiita.com/KM_20005/items/0caaff534860d026d8b2
+
+### 64bitアプリから32bit DLLを呼ぶ(COMサロゲート)
+https://zenn.dev/nmiura_thakaz/articles/d93479bbbbc3fa
+
+### Foundry Local SDKをWPFで使う話
+https://zenn.dev/yakumo3/articles/5a545be2a4cb27
+
+### C#エンジニアがTypeScriptで詰まった概念と書き方まとめ - Qiita
+https://qiita.com/HakamataSoft/items/da0252c10a4128b1f4a0
+
+### Stop Hunting Bugs: Meet the New Visual Studio Debugger Agent Workflow - Visual Studio Blog
+https://devblogs.microsoft.com/visualstudio/stop-hunting-bugs-meet-the-new-visual-studio-debugger-agent/
+
+### Azure MCP tools now ship built into Visual Studio 2022 — no extension required - Visual Studio Blog
+https://devblogs.microsoft.com/visualstudio/azure-mcp-tools-now-ship-built-into-visual-studio-2022-no-extension-required/
+
+### Introducing dotLLM - Building an LLM Inference Engine in C# | Konrad 'Dev Nerd' Kokosa
+https://kokosa.dev/blog/2026/dotllm/
+
+### URL Pattern Matching in .NET - Gérald Barré
+https://www.meziantou.net/url-pattern-matching-in-dotnet.htm
+
+### Getting Started With PgVector in .NET for Simple Vector Search
+https://www.milanjovanovic.tech/blog/getting-started-with-pgvector-in-dotnet-for-simple-vector-search
+
+### Why I’m Building a Database Engine in C#
+https://nockawa.github.io/blog/why-building-database-engine-in-csharp/
+
+### 今日から仕事で使うGodot Engine
+https://docs.google.com/presentation/d/1PuMcHiRoEUBiS7-DYWD882BNLVRE-07fPWBixBMif1U/edit
+
+<!-- https://x.com/muo_jp/status/2044927570865766677?s=12 -->
+<blockquote class="twitter-tweet"><p lang="ja" dir="ltr">昨日のGodot Meetup Tokyoで紹介した「Unityをライセンス的に・CPUアーキテクチャ的に使いにくいsandbox環境でAIにC#コードを安全・全力でリファクタさせるツール/実行環境としてGodotを使うためのcliスクリプト群」無事に社内調整がついたのでOSS公開しました <a href="https://t.co/ShVejd6afs">https://t.co/ShVejd6afs</a> <a href="https://t.co/Zc5n6MLhon">https://t.co/Zc5n6MLhon</a></p>&mdash; Kei Nakazawa (@muo_jp) <a href="https://twitter.com/muo_jp/status/2044927570865766677?ref_src=twsrc%5Etfw">April 16, 2026</a></blockquote>
+<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
+
+
+## ライブラリ、リポジトリ、ツールなど
+### KoMMet/WizGrep
+https://github.com/KoMMet/WizGrep
+
+- [AIを使ってOfficeソフト/PDF/テキストをまとめて横断検索できるアプリを作った](https://zenn.dev/komurodesu/articles/2717aaee6d0dd7)
+
+### akeit0/okojo: Okojo is an experimental low allocation managed JavaScript engine for .NET
+https://github.com/akeit0/okojo?tab=readme-ov-file
+
+<!-- https://x.com/akeit0_/status/2042902335287103775?s=12&t=ggvrrZ7oLogHyNoIGNgjbw -->
+<blockquote class="twitter-tweet"><p lang="ja" dir="ltr">.NET 向け JavaScript エンジン Okojo を公開しました。<br>ベンチマークでは Jint 比 3 倍以上高速、しかも低アロケーション！<br>Wasm組み込みやreflection、d.ts付きbind 生成、node互換ランタイム、vscode debuggerなど拡張もりもりです！<a href="https://t.co/C8XEEKDdNk">https://t.co/C8XEEKDdNk</a></p>&mdash; akeit0 (@Akeit0_) <a href="https://twitter.com/Akeit0_/status/2042902335287103775?ref_src=twsrc%5Etfw">April 11, 2026</a></blockquote>
+<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>