Xamarin Forms Value Converter

IntToBoolConverter.cs

/*
...
xmlns:local="clr-namespace:NAMESPACE"
...
    <ContentPage.Resources>
        <ResourceDictionary>
            <local:IntToBoolConverter x:Key="intToBool" />
        </ResourceDictionary>
    </ContentPage.Resources>
 ...
 
 <Button Text="Hello"
         IsEnabled="{Binding Source={x:Reference entry1}, Path=Text.Length, Converter={StaticResource intToBool}}" />
 */

public class IntToBoolConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (int)value != 0;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (bool)value ? 1 : 0;
    }
}