How do I programm a language independent double.tryparse?

Question

i got string values representing doubles. (f.e. "1.23"). Always with ".".

If you run the code:

double dDouble =0;
string sDemo ="1.23";
double.TryParse(sDemo,out dDouble));

it will return 1.23 to the dDouble var.

If i switch to a different languge with "," as "." .... i get 123.0 as dDouble.

How do I ensure that its always 1.23 ...

double dDouble =0;
string sDemo ="1.23";
double.TryParse(sDemo,System.Globalization.NumberStyles.Any, 
       System.Globalization.CultureInfo.InvariantCulture, out dDouble));

but I am unsure, if this will solve the problem permanently.

i just tried

Answer 1

10 years ago I would solve it like this (do not do that):

sDemo = sDemo.Replace(",",".");

Now

// to string
var text = someDouble.ToString(NumberFormatInfo.InvariantInfo);
// and back
var number = double.Parse(text, NumberFormatInfo.InvariantInfo);

Key point is to use same culture. If you convert values for internal use (to example, passing double value as a part of text) - use invariant culture. If, however, you want to display it to the user and then read user input, then still use same culture: if you don't specify culture for ToString, then don't specify it for Parse, and if you did, then do it again.