ReSharper 2026.1 の新機能

Marking a new step in the evolution of performance monitoring, ReSharper 2026.1 introduces the Monitoring tool window. この新しい専用ツールウィンドウでは実行時のパフォーマンスの状況をより明確かつ包括的に把握でき、問題が自動検出されるため、最適化可能な部分を簡単に特定できます。

The Monitoring tool window lets you observe key runtime metrics of your application as it runs or during debugging. It builds on the capabilities already previously available through our .NET profiling tools and Dynamic Program Analysis (DPA), but brings them together in a single view that makes it easier to evaluate runtime behavior at a glance.

ReSharper が Visual Studio Code と Cursor や Google Antigravity などの互換エディターにも対応しました。これにより、JetBrains の C# ツールをお好みのエディターに導入できるようになりました。

The extension provides real-time code analysis, refactorings, and navigation for C#, XAML, Razor, and Blazor. また、プロジェクトおよびソースジェネレーターを管理するための Solution Explorer（ソリューションエクスプローラー）も含まれており、NUnit、xUnit.net、MSTest のユニットテストを組み込みでサポートしています。

ReSharper 2026.1 expands its support for C# extension members, helping you work more efficiently with the evolving language features.

A new Consolidate extension members context action merges compatible extension declarations and classic extension methods into a single block. The Import extension member quick-fix has also been improved and now supports all kinds of extension members, automatically adding missing using directives when needed.

ReSharper 2026.1 introduces early support for upcoming C# language updates, helping you experiment with new syntax as the language evolves.

This release includes initial support for collection expression arguments and support for the [ExtendedLayout] attribute, ensuring ReSharper continues to work smoothly with the latest compiler innovations.

This release adds several new inspections and style options to help you write safer and more consistent code.

ReSharper now detects short-lived HttpClient instances and suggests safer reuse patterns. It also warns you when ImmutableArray<T> is used with collection initializers, which can lead to a runtime NullReferenceException.

その他、以下のような改善点があります。

• A new inspection for enforcing the order of accessor methods in properties and events.
• A syntax style option for empty strings, allowing you to choose between string.Empty and "".
• Improved nullable reference type migration, with an option to insert #nullable enable automatically in new files.
• Enhanced code completion that can generate method definitions based on [LoggerMessage] attributes.

ReSharper 2026.1 improvements to C++ support include:

• Performance: Faster startup times and lower memory usage in Unreal Engine projects.
• Language support: Support for the C23/C++26 #embed directive, C++23 extended floating-point types, the C2Y _Countof operator, and other features.
• Coding assistance: Auto-import for C++20 modules and postfix completion for primitive types, literals, and user-defined literal suffixes.
• Code analysis: New inspections for out-of-order designated initializers and override visibility mismatches, update of bundled Clang-Tidy to LLVM 22.
• Unreal Engine: Richer Blueprint integration in Code Vision and Find Usages, compatibility fixes for the upcoming Unreal Engine 5.8.

C++ 関連の更新の詳細については、ReSharper C++ 2026.1 の新機能ページをご覧ください。

ReSharper の複数のエディター UI 要素を更新し、Visual Studio のモダンな外観により適合させました。

デザインを刷新することで、エディター組み込みのコード補完 UI がよりすっきりとした一貫性のある外観になりました。

パラメーター情報ポップアップ、ツールチップ、その他のエディターのポップアップを含む多数の関連 UI コンポーネントがモダン化され、古いビジュアル要素が置き換えられ、複数のテーマや DPI の設定で見た目が改善されました。