I live in Sweden and we use decimalcomma for float, double and decimal
numbers but some
people might use decimalpoint so I just wonder what is the best solution to
support both in calculation.
The code below works fine for decimalcomma but get formatException saying
that input string had wrong format.

One solution is to replace decimalpoint with decimalcomma but I don't know
if that is the best solution

protected void Operation_Click(object sender, EventArgs e)
{
switch (((Button)sender).Text)
{
case "+" : txtResult.Text = string.Format("{0:F3}",
Convert.ToDouble(txtNumber1.Text) + Convert.ToDouble(txtNumber2.Text));
break;
case "-": txtResult.Text = string.Format("{0:F3}",
Convert.ToDouble(txtNumber1.Text) - Convert.ToDouble(txtNumber2.Text));
break;
case "*": txtResult.Text = string.Format("{0:F3}",
Convert.ToDouble(txtNumber1.Text) * Convert.ToDouble(txtNumber2.Text));
break;
case "/": txtResult.Text = string.Format("{0:F3}",
Convert.ToDouble(txtNumber1.Text) / Convert.ToDouble(txtNumber2.Text));
break;
}
}

//tony

It seems that you can only have one "NumberDecimalSeparator" at a
time, so you need two calls to TryParse (there must be a better way?):

private static bool TryParse(string str, out double d)
{
// leave the CurrentCulture in its original state
CultureInfo culture = CultureInfo.CurrentCulture.Clone()
as CultureInfo;

foreach (string separator in new string[]{ ",", "."})
{
culture.NumberFormat.NumberDecimalSeparator =
separator;
if (Double.TryParse(str,
NumberStyles.AllowDecimalPoint, culture, out d))
return true;
}

d = 0;
return false;
}

I used a very simple soilution I replaced a decimalcomma with decimalpunkt
for my textField and it works fine.

//Tony

"Ulrik Magnusson" <(E-Mail Removed)> skrev i meddelandet
news:eaeef480-44ae-4f80-938f-(E-Mail Removed)...
> It seems that you can only have one "NumberDecimalSeparator" at a
> time, so you need two calls to TryParse (there must be a better way?):
>
> private static bool TryParse(string str, out double d)
> {
> // leave the CurrentCulture in its original state
> CultureInfo culture = CultureInfo.CurrentCulture.Clone()
> as CultureInfo;
>
> foreach (string separator in new string[]{ ",", "."})
> {
> culture.NumberFormat.NumberDecimalSeparator =
> separator;
> if (Double.TryParse(str,
> NumberStyles.AllowDecimalPoint, culture, out d))
> return true;
> }
>
> d = 0;
> return false;
> }

On 11-05-2011 14:26, Tony Johansson wrote:
> I live in Sweden and we use decimalcomma for float, double and decimal
> numbers but some
> people might use decimalpoint so I just wonder what is the best solution to
> support both in calculation.
> The code below works fine for decimalcomma but get formatException saying
> that input string had wrong format.
>
> One solution is to replace decimalpoint with decimalcomma but I don't know
> if that is the best solution

You can do that. Or you can try both.

But I really believe that the best solution is to inform the user
about the expected format and give him an error for invalid formats.

Arne

On May 12, 12:38*am, "Tony Johansson" <johansson.anders...@telia.com>
wrote:
> I used a very simple soilution I replaced a decimalcomma with decimalpunkt
> for my textField and it works fine.

Nice and simple ;-)

> > Nice and simple ;-)
> In will work until you install the program on a PC where the OS have
> another NumberDecimalSeparator setting than on your developer-PC, and
> you still have introduced a new problem of the number is including
> thousand-separator as well.

Simple but not nice ;-)