CODEWITHSUNDEEP
c#uwp
pawelstack
pawelstack

Reputation: 1

try convert string to decimal

The code below does not work. 1)It is not converting in try function double liczbaa=Convert.ToDouble(a) but it does not doing it and its skipping to exception and then program breaks. 1)It doesnt show format exception "bad values" in trzyde_wynik.Text

namespace Kubik
{
public sealed partial class TrzyDe : Page
{
    public TrzyDe()
    {
        this.InitializeComponent();
    }

    private void wylicz_Click(object sender, RoutedEventArgs e)
    {
        string a, b, c;
        a = wpis_a.ToString();
        b = wpis_b.ToString();
        c = wpis_c.ToString();

        try
        {
            double liczba1 = Convert.ToDouble(a);
            double liczba2 = Convert.ToDouble(b);
            double liczba3 = Convert.ToDouble(c);

        }
        catch(FormatException)
        {
            trzyde_wynik.Text = "bad values";

        }
        double liczbaa = Convert.ToDouble(a);
        double liczbab = Convert.ToDouble(b);
        double liczbac = Convert.ToDouble(c);
        double trzyde_w = (liczbaa * liczbab * liczbac) / 1000000;
        trzyde_wynik.Text = Convert.ToString(trzyde_w);

     }
    }
   }

Upvotes: 0

Views: 1591

Answers (1)

LocEngineer
LocEngineer

Reputation: 2917

So there are obviously three issues here:

  1. Properly interpreting the text box values as double
  2. Respecting the culture-specific decimal separator
  3. Returning the result with decimal separator instead of scientific notation

Based on this, the following should get you going. Please note the usage of double.TryParse() and ToString("F6") which formats the result as floating point number with 6 decimals behind the separator: 

private void wylicz_Click(object sender, RoutedEventArgs e)
{
    string a, b, c;

    var culture = System.Globalization.CultureInfo.CreateSpecificCulture("pl-PL");
    var style = System.Globalization.NumberStyles.Number;
    a = wpis_a.Text;
    b = wpis_b.Text;
    c = wpis_c.Text;

    double liczba1 = 0.0;
    double liczba2 = 0.0;
    double liczba3 = 0.0;

    if (!(double.TryParse(a, style, culture, out liczba1) && double.TryParse(b, style, culture, out liczba2) && double.TryParse(c, style, culture, out liczba3)))
    {
        trzyde_wynik.Text = "bad values";
    }
    else
    {
        double trzyde_w = (liczba1 * liczba2 * liczba3) / 1000000;
        trzyde_wynik.Text = trzyde_w.ToString("F6", culture);
    }
}

Upvotes: 2

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