When language is set to French, decimal point separator ',' is ignored in binding to a double property

Question

So I have an Entry bound to a double property with Keyboard="Numeric".

• NO StringFormat is used, and not modifying/forcing culture at app level.

• Confirmed that in French the decimal point separator character is "," so "." won't be an allowed character:

  CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator equals ','
  

The issue is when I type "12,3", in the property setter the value is equal to 123. And of course at the end it displays 123 in the Entry field instead of "12,3".

xaml

<Entry Keyboard="Numeric" Text="{Binding MyProperty}"/>

C#

private double _MyProp;

public double MyProperty
{
    get { return _MyProp; }
    set { SetProperty(ref _MyProp, value); }
}

How to overcome this issue?

Answer 1

It seems to be a Xamarin.Forms issue Fixed in #5005, as a workaround, use a value converter:

<ContentPage.Resources>
    <app1:DecimalPointFixConverter x:Key="DecimalPointFixConverter"/>
</ContentPage.Resources>

<Entry Keyboard="Numeric" Text="{Binding Path=MyProperty, Converter={x:StaticResource DecimalPointFixConverter}}"/>

DecimalPointFixConverter.cs

public class DecimalPointFixConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (value as string)?.Replace(',', '.') ?? value;
    }
}

Related question

Decimal point is being removed in Entry