C#: Cannot Parse String to double

Question

_day.Latitude = "64.128339"

_day.Longitude = "-20.995595"

public override void Prepare(ItineraryDay day)
{
    _day = day;

    var isParseLatitude = double.TryParse(_day.Latitude, out var latitude);
    var isParseLongitude = double.TryParse(_day.Longitude, out var longitude);

    _dayPositionInfo = new DayPositionInfo(
        latitude,
        longitude,
        _day.RouteName);
}

As you can see in the picture, Latitude and Longitude are valid double values, but Parse does not work and returns false? Why, I do not understand something?

`double.TryParse` is culture-dependent, which seems like a bad default to me but there you go. — Ry-, Nov 01 '18 at 08:28

Rui Jarimba · Answer 1 · 2018-11-01T08:34:02.577

I suspect your current culture doesn't use the . character as a decimal separator, that's why Double.TryParse returns false.

If you know that the decimal separator is always a ., you can do something like this:

bool isValidLatitude = Double.TryParse("64.128", NumberStyles.Any, CultureInfo.InvariantCulture, out double latitude);

PS: if you need to check what is the decimal separator of your current culture, use

Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator

score -1 · Answer 2 · answered Nov 01 '18 at 08:29

-1

Convert.ToDouble("64.128339");
double.Parse("64.128339");

answered Nov 01 '18 at 08:29

Umair Rasheed

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3
9

1

What does this mean…? – Ry- Nov 01 '18 at 08:30
conversion types to double data type in C# – Umair Rasheed Nov 01 '18 at 08:30
2

This will fail in exactly the same way for the OP, for exactly the same reason, even while It Works On Your Machine™ – Hans Keﬆing Nov 01 '18 at 08:34

C#: Cannot Parse String to double

2 Answers2