Posts

• JohnHardman GBUniversity admin

  September 2017

  @biapar - All of the usual conversion methods have locale-specific and locale-independent options.

  Converting a double to a string in a locale independent way is done by:

  value.ToString(CultureInfo.InvariantCulture)
  

  See https://msdn.microsoft.com/en-us/library/shxtf045(v=vs.110).aspx

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• biapar ITMember ✭✭✭

  September 2017

  I find the problem, but not the solution.
  This code return the correct results, if I setup my phone with English language and United States region. See images.
  
  
  

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• JohnHardman GBUniversity admin

  September 2017

  @biapar - Show the code where you take the double value and convert it to a string for display (which could be in a value converter or elsewhere).

  Also. what result do you want? Do you want it to always use a "." for the decimal separator, or do you want it to use the appropriate character for the current locale?

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• seanyda GBMember ✭✭✭✭✭

  September 2017 edited September 2017

  You can force a Culture on the app which would fix the problem
  Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
  Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-US");

  This would go in the platform specific code.

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• biapar ITMember ✭✭✭

  September 2017

  Hi, thank for your reply.
  I wish to return the correct result by current locale. That is 1.2345,45 for ITA.

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• JohnHardman GBUniversity admin

  September 2017

  @biapar - Show the code where you take the double value and convert it to a string for display (which could be in a value converter or elsewhere).

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• biapar ITMember ✭✭✭

  September 2017

  Distance calculation:

  private double distance(double lat1, double lon1, double lat2, double lon2, char unit)
  {
  double theta = lon1 - lon2;
  double dist = Math.Sin(deg2rad(lat1)) * Math.Sin(deg2rad(lat2)) + Math.Cos(deg2rad(lat1)) * Math.Cos(deg2rad(lat2)) * Math.Cos(deg2rad(theta));
  dist = Math.Acos(dist);
  dist = rad2deg(dist);
  dist = dist * 60 * 1.1515;
  if (unit == 'K')
  {
  dist = dist * 1.609344;
  }
  else if (unit == 'N')
  {
  dist = dist * 0.8684;
  }
  return (dist);
  }

      private double deg2rad(double deg)
      {
          return (deg * Math.PI / 180.0);
      }
  
      private double rad2deg(double rad)
      {
          return (rad / Math.PI * 180.0);
      }
  

  Variable Assignment ( elemento.Distanza is a Double ):

  elemento.Distanza = Math.Round(distance(lastmypoint.Latitude, lastmypoint.Longitude, pointB.Latitude, pointB.Longitude, 'K'),2);

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• JohnHardman GBUniversity admin

  September 2017

  @biapar - Show the code where you take the double value and convert it to a string for display (which could be in a value converter or elsewhere).

  The calculation code only operates on doubles. It's the code that takes the doubles and goes on to display them that is relevant here.

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• biapar ITMember ✭✭✭

  September 2017

  @JohnHardman said:
  @biapar - Show the code where you take the double value and convert it to a string for display (which could be in a value converter or elsewhere).

  The calculation code only operates on doubles. It's the code that takes the doubles and goes on to display them that is relevant here.

  I assign the value with this code:
  elemento.Distanza = Math.Round(distance(lastmypoint.Latitude, lastmypoint.Longitude, pointB.Latitude, pointB.Longitude, 'K'),2);

  and show the value with Label

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• biapar ITMember ✭✭✭

  October 2017

  I solved the problem.
  The problem was caused by dot into the item value and in Italian culture was used like thousand separator.

  Position pointB = new Position(double.Parse(item.Lat, CultureInfo.InvariantCulture), double.Parse(item.Long, CultureInfo.InvariantCulture));
  

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