c# - try convert string to decimal -


the code below not work. 1)it not converting in try function double liczbaa=convert.todouble(a) not doing , skipping exception , 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;         = 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);       }     }    }

so there 3 issues here:

  1. properly interpreting text box values double
  2. respecting culture-specific decimal separator
  3. returning result decimal separator instead of scientific notation

based on this, following should going. please note usage of double.tryparse() , tostring("f6") formats result floating point number 6 decimals behind 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;     = 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);     } }

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