ReSharper 2025.1 の新機能

Previously, using nameof required specifying all type arguments, causing unnecessary verbosity. C# 14 allows nameof(List<>) without explicitly listing type arguments. ReSharper が nameof 式内の冗長なジェネリック型引数を検出し、それらを単純化するクイックフィックスを提供するようになりました。

C# 14 introduces new implicit conversions between ReadOnlySpan<T>, Span<T>, and T[], making span-based code more intuitive. ReSharper はこれらの変換ルールを完全にサポートしており、効率的でモダンな C# コードの作成を支援します。

With C# 14, you can now use parameter modifiers like ref, out, in, and scoped in lambda expressions without needing explicit parameter types. ReSharper は冗長な型指定を除去するクイックフィックスを提供します。

A new context action lets you convert string interpolation back to concatenation. While ReSharper has long supported converting string concatenation ("Id = " + someId) to interpolation ($"Id = {someId}") or string.Format("Id = {0}", someId), this update completes the cycle by allowing the reverse transformation, giving you more flexibility in structuring string expressions.

ReSharper now detects and highlights even more code duplication patterns appearing in conditional constructs like if and switch, and makes refactoring suggestions for cleaner, more maintainable code.

ReSharper now detects cases where a method-level CancellationToken is mistakenly used instead of a local token. It offers a quick-fix to replace the incorrect token or merge multiple tokens using CancellationTokenSource.CreateLinkedTokenSource().

Calling .ToString() on enum members can incur unnecessary runtime overhead. ReSharper now suggests replacing it with nameof(SomeEnum.Member), improving performance and clarity.

ReSharper 2025.1 suggests explicit tuple component names instead of generic ItemN names, making your code more readable and self-documenting.

ReSharper now warns you when Stream.Read() and ReadAsync() methods are used without checking their return values, which can lead to incomplete data reads. It suggests replacing them with .ReadExactly() to ensure correctness.

Since Debug.Assert calls are removed in RELEASE builds, ReSharper warns you about assertions that modify state and could lead to unexpected behavior in production code.

ReSharper 2025.1 には、C++ のサポートに関するいくつかの改善が行われています。

• The Inline Macro refactoring introduced.
• いくつかの新しい GNU 言語拡張がサポートされるようになりました。
• 大量のブループリントアセットを含む Unreal Engine プロジェクトでのメモリ使用量が最適化されました。
• Clang-Tidy 20 がバンドルされるようになり、ARM デバイスでの Clang-Tidy の使用がサポートされるようになりました。
• GoogleTest のサポートが更新されました。

Learn more about the C++ updates from the What's New in ReSharper C++ 2025.1 page.

A new formatting action applies chop formatting to various C# constructs, improving code readability and consistency.

We've refined Push-to-Hint behavior in ReSharper to prevent unintended activations caused by conflicts with other Ctrl-based shortcuts. Additionally, we've introduced a visual indicator to show when the mode is active.

ReSharper now visually highlights members that extend base classes or implement specific interfaces when you place the caret over a type name in the base types clause.

We've been testing the latest out-of-process (OOP) implementation of ReSharper internally for the past four weeks, and we're truly excited about the results so far. While we're still working to support all features and fix known issues, the core functionality that makes ReSharper an essential part of your development workflow is coming together nicely.

Read our latest blog post for a complete status update on OOP ReSharper.

dotMemory が Microsoft Visual Studio に完全統合されました。 以前は Visual Studio 内からプロファイリングを開始することしかできませんでしたが、結果を解析するにはスタンドアロンの dotMemory アプリケーションに切り替える必要がありました。 このリリースにより、アプリケーションのプロファイリングとメモリスナップショットの解析の両方を IDE を離れることなく行えるようになりました。

Qodana is a team code quality tool that leverages JetBrains inspections to help teams run checks and audits and establish quality gates in their favorite CI/CD pipeline. Now, you can download the Qodana Code quality extension via your ReSharper installer to bring Qodana Cloud or self-hosted Qodana projects into Visual Studio.

Identify code issues, bugs, and vulnerabilities, run the analyses directly in your pipeline, and then view issues in your IDE where you work for better contextual updates and learning. You also have the option to download it as a standalone tool using the ReSharper installer.

ReSharper 2025.1 comes with a bundled Unity plugin that supports all major game development workflows. The plugin provides code completion for Unity event functions and APIs, tooltip summaries with links to Unity documentation, and specialized inspections to detect common pitfalls. It includes ShaderLab file support with syntax highlighting, code completion, and error detection. このプラグインは .meta ファイルを自動的に処理し、Unity シーン、プレハブ、アセット内のフィールドおよびメソッドの暗黙的な使用箇所を検出します。

ReSharper C++ continues to provide dedicated support for Unreal Engine development.

ReSharper 2025.1 brings several improvements to the decompiler, enhancing support for the latest C# features and improving code readability. Here’s what’s new:

• Support for required members.
• Added support for the new System.Threading.Lock type introduced in C# 13.
• Support for ref fields and scoped parameter modifiers.
• Support for the allows ref struct generic anti-constraint.
• Pattern-based using for ref struct types.
• Support for string interpolation.
• Certain integer constants in decompiled code now include commented hexadecimal representations for better readability.
• Support for file-scoped namespaces.