Analyzer

Diagnostic ID: CA1862: Use the 'StringComparison' method overloads to perform case-insensitive string comparisons

Analyzer source

SDK: Built-in CA analyzers in .NET 8 SDK

Version: SDK 8.0.100

Describe the bug

CA1862 should not be shown when the same variable is on both sides of the comparison.

Steps To Reproduce

if (name.ToLower() == name)
    Console.WriteLine("all letters are lowercase");

And the suggested fix changes the behavior completely:

// always true now
if (name.Equals(name, StringComparison.CurrentCultureIgnoreCase))
    Console.WriteLine("all letters are lowercase");