Incorrect NaN test (CA2242)
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Key dotnet.codequality.nan-comparison · Severity error · Category codequality
Microsoft analyzer CA2242. Flags a comparison with double.NaN or float.NaN. NaN is never equal to anything, itself included, so the test is always false; double.IsNaN is the check.
Incorrect
Section titled “Incorrect”if (ratio == double.NaN) return 0;Correct
Section titled “Correct”if (double.IsNaN(ratio)) return 0;