C# Advent Calendar 2025

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147 followers

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Category：Programming language

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@t13801206

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🎄 プログラミング言語 C# アドベントカレンダー 2025

今年も C# アドベンドカレンダーの季節がやってまいりました🎅✨
C# に関係する記事をどんどん投稿していきましょう！

🧱 C# で作ったものの紹介
🎓 すごいことでもないし、新しいことでもないけれど、みんなに知らせたいこと
🔁 失敗談・振り返り
✨ 最近ハマった/好きな C# 機能の紹介と実例
💡 小ネタ/Tip 集、アンチパターン、設計トレードオフの整理
🚀 パフォーマンス改善やメモリ最適化、ビルド/デプロイの工夫
🧪 テスト、品質向上、ベンチマークの活用

🔗 参考リンク

⏮️ 過去のアドベントカレンダー

How to join the calendar

You can join the calendar by selecting an available date and registering the URL of the article you wish to link to. If a slot is available, you can go back to a past date to join!

Series 1

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@EndOfData 【C#】ドライブ内ファイルの列挙処理で非同期なPause/Resumeを書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@EndOfData WinUI3でWindowSize(Width/Height)を設定する拡張メソッド Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Sakai_path C# は史上初めて Java を追い抜くことになるのか？ - 2025年11月のTIOBE指数 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kttFox [WPF] デザイナー用データをStaticで定義する Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Lemon73 Ubuntu 環境に .NET 10 をインストールしてみた (+ エラーの対応方法) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@EndOfData 【C#】Interfaceをデリゲートのように扱って規約実装を伝播させる設計パターン Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@t13801206 祝 .NET 10 リリース㊗️ようこそ Visual Studio 2026 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hiro_t MVVMの論点 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hqf00342 C#にあったらいいなと思う記法・言語仕様 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@pmc-ko プリザンターのサーバスクリプトでC#スクリプトがつかえるようにしてみる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nulleins C# 初心者が Casio のキーボードと BLE 接続するために C# を使った話を書きます。たぶん。ここに書ける文字列って制限あるんですかね？ちょっと気になります。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@inco-cyber 【WinUI3】WinUI3を使うのに必須ないろいろ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@prozolic 【.NET】FrozenDictionaryの最適化戦略 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@mizusawa_kinuko 【Unity】classとstructの使い分けは「コピーしていいか」が大きな判断軸になると思う話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@RyotaMurohoshi C#のラムダ式のアップデート内容まとめ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Sakai_path 【C#】Interlocked / Volatile を「正しく」使う最短ガイド Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@HeroDevs-Japan 【.NET 6 をまだ使っている方向け】10月末に報告された緊急度の高いCVEにすぐ対応できます。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@HexagramNM [C#] ローカルでビルドしたNAudioをNuGetで利用する Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@HexagramNM [C#] WebView2から出る音声を画面共有で流す Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Akeit0_ 【.NET】EmbeddedResource, UTF8リテラルはどこにあるのか？PE Image に入門 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@kuto110 プロパティのILを確認してみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@arimoo タプルと拡張メソッドと我が社 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@dexcter WinFormsのFormが重くなってきたら始めるリファクタ2選 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nenoNaninu 【C#】DATAS という GC の機能について。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@pCYSl5EDgo 遅すぎたんだ！.NET Runtime最適化の提案が Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@EndOfData
【C#】ドライブ内ファイルの列挙処理で非同期なPause/Resumeを書く
Overwrite
Title
URL
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@EndOfData
WinUI3でWindowSize(Width/Height)を設定する拡張メソッド
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@Sakai_path
C# は史上初めて Java を追い抜くことになるのか？ - 2025年11月のTIOBE指数
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@kttFox
[WPF] デザイナー用データをStaticで定義する
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@Lemon73
Ubuntu 環境に .NET 10 をインストールしてみた (+ エラーの対応方法)
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@EndOfData
【C#】Interfaceをデリゲートのように扱って規約実装を伝播させる設計パターン
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@t13801206
祝 .NET 10 リリース㊗️ようこそ Visual Studio 2026
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@hiro_t
MVVMの論点
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@hqf00342
C#にあったらいいなと思う記法・言語仕様
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@pmc-ko
プリザンターのサーバスクリプトでC#スクリプトがつかえるようにしてみる
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@nulleins
C# 初心者が Casio のキーボードと BLE 接続するために C# を使った話を書きます。たぶん。ここに書ける文字列って制限あるんですかね？ちょっと気になります。
Overwrite
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@inco-cyber
【WinUI3】WinUI3を使うのに必須ないろいろ
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@prozolic
【.NET】FrozenDictionaryの最適化戦略
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@mizusawa_kinuko
【Unity】classとstructの使い分けは「コピーしていいか」が大きな判断軸になると思う話
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@RyotaMurohoshi
C#のラムダ式のアップデート内容まとめ
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@Sakai_path
【C#】Interlocked / Volatile を「正しく」使う最短ガイド
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@HeroDevs-Japan
【.NET 6 をまだ使っている方向け】10月末に報告された緊急度の高いCVEにすぐ対応できます。
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@HexagramNM
[C#] ローカルでビルドしたNAudioをNuGetで利用する
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@HexagramNM
[C#] WebView2から出る音声を画面共有で流す
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@Akeit0_
【.NET】EmbeddedResource, UTF8リテラルはどこにあるのか？PE Image に入門
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@kuto110
プロパティのILを確認してみた
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@arimoo
タプルと拡張メソッドと我が社
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@dexcter
WinFormsのFormが重くなってきたら始めるリファクタ2選
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@nenoNaninu
【C#】DATAS という GC の機能について。
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@pCYSl5EDgo
遅すぎたんだ！.NET Runtime最適化の提案が
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Series 2

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@kyoooohei_y 「動くはずなのに…」System.Text.Json でハマった実行時例外の話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y その状態は誰の都合か？ ― HTTPのステートレス性と状態管理の設計 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y サービス地獄とは何か〜依存関係がツリーからツタに変わる瞬間〜 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y Repositoryは何を抽象化する存在なのか Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y EF Coreで「今DB？それともメモリ？」を見失わないための実装者向けまとめ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y EF Core 拡張メソッド実装テンプレ集 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@laughter [C#] structは全フィールドがゼロ初期化された場合でも正しい値になるときのみ使用すること Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Sakai_path C# 14 で「null なら何もしない代入」が書けるようになった Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Sakai_path 【Visual Studio 2026】MCPがついに標準化！NuGet MCPを有効化して動作確認してみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hiro_t Excel-DNA プロジェクトを.net 6から.net8へ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tmyt cspsc - 実はプリンタは計算機だったのかもしれない Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@haruyaNekoder EF Core の AsSplitQuery() を理解する〜Cartesian Explosion（デカルト積爆発）問題とその解決策〜 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yamachu NativeFileReferenceを含んだWebAssembly向けC# nugetパッケージの後方互換性をなんとかしよう Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@aetos JsonSerializer のシリアライズ処理を一元的にカスタマイズする Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Nagachan_T Go に学ぶ例外キャッチを使わない戦術 (C# 版) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@skitoy4321 grpc-dotnetを使用するときのタイムアウト Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@EndOfData 【C#】FoldRight（右畳み込み）の利点と実装パターン例 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y 【小さく始める設計①】Entity / Model / MVC をどう整理するか〜層構造と関心ごとの考え方〜 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y 【小さく始める設計②】ユースケース層とアプリケーション層は何が違うのか〜責務を分ける理由を整理する〜 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y 【小さく始める設計③】拡張メソッドで責務を分離するという選択〜Model を肥大化させないために〜 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@kyoooohei_y 【小さく始める設計④】最初から作りすぎない〜層を段階的に追加していく設計方針〜 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@umbreon-nu .NET Frameworkアプリケーションのバージョン更新の手間を減らす Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Sakai_path 「拡張メソッドの限界突破」C# 14 の Extension members を超簡潔に解説 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ikenohotori バージョンアップについて Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@RYA234 生成AI活用 MESCIUS ActiveReports.NET 18（試用版）のページレポートの項目一覧を取得する Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@kyoooohei_y
「動くはずなのに…」System.Text.Json でハマった実行時例外の話
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@kyoooohei_y
その状態は誰の都合か？ ― HTTPのステートレス性と状態管理の設計
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@kyoooohei_y
サービス地獄とは何か〜依存関係がツリーからツタに変わる瞬間〜
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@kyoooohei_y
Repositoryは何を抽象化する存在なのか
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@kyoooohei_y
EF Coreで「今DB？それともメモリ？」を見失わないための実装者向けまとめ
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@kyoooohei_y
EF Core 拡張メソッド実装テンプレ集
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@laughter
[C#] structは全フィールドがゼロ初期化された場合でも正しい値になるときのみ使用すること
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@Sakai_path
C# 14 で「null なら何もしない代入」が書けるようになった
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@Sakai_path
【Visual Studio 2026】MCPがついに標準化！NuGet MCPを有効化して動作確認してみた
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@hiro_t
Excel-DNA プロジェクトを.net 6から.net8へ
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@tmyt
cspsc - 実はプリンタは計算機だったのかもしれない
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@haruyaNekoder
EF Core の AsSplitQuery() を理解する〜Cartesian Explosion（デカルト積爆発）問題とその解決策〜
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@yamachu
NativeFileReferenceを含んだWebAssembly向けC# nugetパッケージの後方互換性をなんとかしよう
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@aetos
JsonSerializer のシリアライズ処理を一元的にカスタマイズする
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@Nagachan_T
Go に学ぶ例外キャッチを使わない戦術 (C# 版)
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@skitoy4321
grpc-dotnetを使用するときのタイムアウト
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@EndOfData
【C#】FoldRight（右畳み込み）の利点と実装パターン例
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@kyoooohei_y
【小さく始める設計①】Entity / Model / MVC をどう整理するか〜層構造と関心ごとの考え方〜
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@kyoooohei_y
【小さく始める設計②】ユースケース層とアプリケーション層は何が違うのか〜責務を分ける理由を整理する〜
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@kyoooohei_y
【小さく始める設計③】拡張メソッドで責務を分離するという選択〜Model を肥大化させないために〜
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@kyoooohei_y
【小さく始める設計④】最初から作りすぎない〜層を段階的に追加していく設計方針〜
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@umbreon-nu
.NET Frameworkアプリケーションのバージョン更新の手間を減らす
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@Sakai_path
「拡張メソッドの限界突破」C# 14 の Extension members を超簡潔に解説
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@ikenohotori
バージョンアップについて
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@RYA234
生成AI活用 MESCIUS ActiveReports.NET 18（試用版）のページレポートの項目一覧を取得する
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Series 3

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30	Join calendar on 1 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 2 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 3 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 4 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 5 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 6 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
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Join calendar on 14 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 15 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 16 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 17 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 18 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 19 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 20 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
Join calendar on 21 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 22 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 23 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 24 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 25 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

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30	@EndOfData 【C#】ドライブ内ファイルの列挙処理で非同期なPause/Resumeを書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@EndOfData WinUI3でWindowSize(Width/Height)を設定する拡張メソッド Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Sakai_path C# は史上初めて Java を追い抜くことになるのか？ - 2025年11月のTIOBE指数 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kttFox [WPF] デザイナー用データをStaticで定義する Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Lemon73 Ubuntu 環境に .NET 10 をインストールしてみた (+ エラーの対応方法) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@EndOfData 【C#】Interfaceをデリゲートのように扱って規約実装を伝播させる設計パターン Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@t13801206 祝 .NET 10 リリース㊗️ようこそ Visual Studio 2026 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hiro_t MVVMの論点 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hqf00342 C#にあったらいいなと思う記法・言語仕様 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@pmc-ko プリザンターのサーバスクリプトでC#スクリプトがつかえるようにしてみる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nulleins C# 初心者が Casio のキーボードと BLE 接続するために C# を使った話を書きます。たぶん。ここに書ける文字列って制限あるんですかね？ちょっと気になります。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@inco-cyber 【WinUI3】WinUI3を使うのに必須ないろいろ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@prozolic 【.NET】FrozenDictionaryの最適化戦略 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@mizusawa_kinuko 【Unity】classとstructの使い分けは「コピーしていいか」が大きな判断軸になると思う話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@RyotaMurohoshi C#のラムダ式のアップデート内容まとめ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Sakai_path 【C#】Interlocked / Volatile を「正しく」使う最短ガイド Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@HeroDevs-Japan 【.NET 6 をまだ使っている方向け】10月末に報告された緊急度の高いCVEにすぐ対応できます。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@HexagramNM [C#] ローカルでビルドしたNAudioをNuGetで利用する Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@HexagramNM [C#] WebView2から出る音声を画面共有で流す Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Akeit0_ 【.NET】EmbeddedResource, UTF8リテラルはどこにあるのか？PE Image に入門 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@kuto110 プロパティのILを確認してみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@arimoo タプルと拡張メソッドと我が社 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@dexcter WinFormsのFormが重くなってきたら始めるリファクタ2選 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nenoNaninu 【C#】DATAS という GC の機能について。 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@pCYSl5EDgo 遅すぎたんだ！.NET Runtime最適化の提案が Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@EndOfData
【C#】ドライブ内ファイルの列挙処理で非同期なPause/Resumeを書く
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@EndOfData
WinUI3でWindowSize(Width/Height)を設定する拡張メソッド
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@Sakai_path
C# は史上初めて Java を追い抜くことになるのか？ - 2025年11月のTIOBE指数
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@kttFox
[WPF] デザイナー用データをStaticで定義する
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@Lemon73
Ubuntu 環境に .NET 10 をインストールしてみた (+ エラーの対応方法)
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@EndOfData
【C#】Interfaceをデリゲートのように扱って規約実装を伝播させる設計パターン
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@t13801206
祝 .NET 10 リリース㊗️ようこそ Visual Studio 2026
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@hiro_t
MVVMの論点
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@hqf00342
C#にあったらいいなと思う記法・言語仕様
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@pmc-ko
プリザンターのサーバスクリプトでC#スクリプトがつかえるようにしてみる
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@nulleins
C# 初心者が Casio のキーボードと BLE 接続するために C# を使った話を書きます。たぶん。ここに書ける文字列って制限あるんですかね？ちょっと気になります。
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@inco-cyber
【WinUI3】WinUI3を使うのに必須ないろいろ
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@prozolic
【.NET】FrozenDictionaryの最適化戦略
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@mizusawa_kinuko
【Unity】classとstructの使い分けは「コピーしていいか」が大きな判断軸になると思う話
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@RyotaMurohoshi
C#のラムダ式のアップデート内容まとめ
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@Sakai_path
【C#】Interlocked / Volatile を「正しく」使う最短ガイド
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@HeroDevs-Japan
【.NET 6 をまだ使っている方向け】10月末に報告された緊急度の高いCVEにすぐ対応できます。
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@HexagramNM
[C#] ローカルでビルドしたNAudioをNuGetで利用する
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@HexagramNM
[C#] WebView2から出る音声を画面共有で流す
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@Akeit0_
【.NET】EmbeddedResource, UTF8リテラルはどこにあるのか？PE Image に入門
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@kuto110
プロパティのILを確認してみた
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@arimoo
タプルと拡張メソッドと我が社
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@dexcter
WinFormsのFormが重くなってきたら始めるリファクタ2選
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@nenoNaninu
【C#】DATAS という GC の機能について。
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@pCYSl5EDgo
遅すぎたんだ！.NET Runtime最適化の提案が
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You can increase the number of series when Calendar 3 is filled with more than 10 articles.