double.Parse throw a System.FormatException

Question

I am trying to parse some string to a double value, using this parse method overload:

double.Parse("198.222213745118", CultureInfo.CurrentUICulture);

the CultureInfo.CurrentUICulture is fr-FR. but this is throwing an exception of type FormatException.

What can be the reason?

`198.222213745118` should be `198,222213745118` (**,** instead of **.**)? — Alessandro D'Andria, Sep 17 '13 at 10:36
Right, but I thought that this is the job of this double.parse method — user2717436, Sep 17 '13 at 10:38
No, it can't do it in full generality. e.g. 1,234 is one thousand two hundred and thirty four in England, a little over 1 in France — Bathsheba, Sep 17 '13 at 10:39
If you have control over the string you may want to use [NumberDecimalSeparator](http://msdn.microsoft.com/en-us/library/system.globalization.numberformatinfo.numberdecimalseparator.aspx) — Sayse, Sep 17 '13 at 10:39
So how i can do it? I mean - this string is read from a xml file and I get it just like it is (with a ",") how can I parse it to double when my culture is french? — user2717436, Sep 17 '13 at 10:42
Thank you, I used CultureInfo.InvariantCulture and it is working just graet — user2717436, Sep 17 '13 at 11:01

score 5 · Answer 1 · answered Sep 17 '13 at 10:36

5

French (i.e. fr-FR) use a comma to denote the start of the decimal part, not a period. They use a period to separate thousands.

answered Sep 17 '13 at 10:36

Bathsheba

Sure, but for this reason I sent my culture to the parse method. – user2717436 Sep 17 '13 at 10:39
@user2717436, the culture needs to be consistent with that in the UI control. – Bathsheba Sep 17 '13 at 10:40
Yes, preciselly, and the thousand separator part is only in written language, the same with Romanian culture. `double.Parse` will not stand for `.` it will throw an exception. – Eduard Dumitru Sep 17 '13 at 10:41
So how can I do it? I mean - this string is read from xml file, and I got it just like this (with "," separator). how can I parse it to double depends on my culture? – user2717436 Sep 17 '13 at 10:57
The XML file should use a specific format. Specify a culture that has a format consistent with the one used in the XML file. – Klas Lindbäck Feb 11 '16 at 09:33

NutCracker · Answer 2 · 2018-09-25T07:12:12.837

0

I know this question is old but my answer might help someone else. So this is the answer:

double.Parse("198.222213745118", System.Globalization.NumberStyles.AllowDecimalPoint, System.Globalization.NumberFormatInfo.InvariantInfo);

instead of

double.Parse("198.222213745118", CultureInfo.CurrentUICulture);

edited Sep 25 '18 at 07:12

answered Apr 02 '16 at 16:15

NutCracker

score -2 · Answer 3 · answered Sep 17 '13 at 10:40

-2

I suggest using the Double.TryParse rather than the .Parse as it is safer to use and makes sure you dont get any exception on parsing.

Here is a Code for you to use,

double answer = -1;
Double.TryParse("Value", out answer);

Now all you have to do is do a conditional statement that'll check if it indeed parsed' the string.

answered Sep 17 '13 at 10:40

DevEstacion

2

Very very bad idea due to ambiguity. E.g. what would it do with 1,234? – Bathsheba Sep 17 '13 at 10:40

3 Answers3