double.Parse throw a System.FormatException

问题

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?

回答1:

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.

回答2:

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);

回答3:

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.

来源：https://stackoverflow.com/questions/18847526/double-parse-throw-a-system-formatexception