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Asked: 2026-06-09T07:05:39+00:00

Does the C# Double parse NaN correctly, ie. does Double.Parse(NaN).ToString() == NaN ?

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Does the C# Double parse “NaN” correctly, ie. does Double.Parse("NaN").ToString() == "NaN"?

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  1. Editorial Team
    var d = Double.Parse("NaN");
Console.WriteLine(d); // prints "NaN"

    I’m running under the en-US locale. As Joey notes, be careful around this. I got the same results when I specified the invariant culture (as one often should in these circumstances):

    var d = Double.Parse("NaN", CultureInfo.InvariantCulture);
Console.WriteLine(d.ToString(CultureInfo.InvariantCulture)); // prints "NaN"
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