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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'.
This check corresponds to Roslyn rule CA1862. For full rule details, see the Microsoft website: CA1862.
| Class Name | Use the 'StringComparison' method overloads to perform case-insensitive string comparisons (C#) |
|---|---|
| Significance | reliability |
| Mnemonic | ROSLYN.PERFORMANCE.CA1862 |
| Categories | None |
| Availability | Available for C# only. |
| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Use the 'StringComparison' method overloads to perform case-insensitive string comparisons (C#)" |
The following configuration file parameters affect checks for this warning class.
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