Xamarin Mask Entry Currency 2 Decimal Places

Question

I'm using the following code to mask an entry field for currency. The only issue is I want to limit the input to 2 decimal places. How can I modify the code the accomplish this?

public class CurrencyConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return Decimal.Parse(value.ToString()).ToString("C");
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        string valueFromString = Regex.Replace(value.ToString(), @"\D", "");

        if (valueFromString.Length <= 0)
            return 0m;

        long valueLong;
        if (!long.TryParse(valueFromString, out valueLong))
            return 0m;

        if (valueLong <= 0)
            return 0m;

        return valueLong / 100m;
    }
}

Answer 1

If you want to limit two decimals，you could add the conditions in the entry textchanged event.

like:

<Entry x:Name="entry" Keyboard="Numeric"  HorizontalOptions="StartAndExpand" WidthRequest="600" TextChanged="Entry_TextChanged"></Entry>

in the behind code:

private void Entry_TextChanged(object sender, TextChangedEventArgs e)
    {
      
        if (e.NewTextValue.Contains("."))
        {
            if (e.NewTextValue.Length - 1 - e.NewTextValue.IndexOf(".") > 2)
            {
              var  s = e.NewTextValue.Substring(0, e.NewTextValue.IndexOf(".") + 2 + 1);
                entry.Text =s;
                entry.SelectionLength = s.Length;
            }
        }

    }

the effect: