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See Roslyn-Detected C# Warning Classes for more information.
Avoid calling 'ToLower', 'ToUpper', 'ToLowerInvariant' and 'ToUpperInvariant' to perform case-insensitive string comparisons because they lead to an allocation. Instead, prefer calling the method overloads of 'Contains', 'IndexOf' and 'StartsWith' that take a 'StringComparison' enum value to perform case-insensitive comparisons. Switching to using an overload that takes a 'StringComparison' might cause subtle changes in behavior, so it's important to conduct thorough testing after applying the suggestion. Additionally, if a culturally sensitive comparison is not required, consider using 'StringComparison.OrdinalIgnoreCase'.
この指摘はRoslynのCA1862に該当します。ルール詳細につい ては、下記リンクを参照してください。 CA1862
| クラス名 | Use the 'StringComparison' method overloads to perform case-insensitive string comparisons (C#) |
|---|---|
| 日本語クラス名 | Use the 'StringComparison' method overloads to perform case-insensitive string comparisons (C#) |
| クラス分類 | 信頼性 (reliability) |
| ニーモニック | ROSLYN.PERFORMANCE.CA1862 |
| カテゴリー | なし |
| 対応言語 | C# で利用可能です。 |
| 有効/無効設定 | このワーニングクラスのチェックはデフォルトで有効になっています。チェックを無効にするにはプロジェクト設定ファイル
(configuration file)に以下の WARNING_FILTER ルールを追加してください。
WARNING_FILTER += discard class="Use the 'StringComparison' method overloads to perform case-insensitive string comparisons (C#)" |
設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。