HyphenIfEmpty.cs

using System.Globalization;
 
namespace NeuroAccessMaui.UI.Converters
{
    [AcceptEmptyServiceProvider]
    public class HyphenIfEmpty : IValueConverter, IMarkupExtension
    {
        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            if (value is string s && string.IsNullOrEmpty(s))
                return "-";
            else
                return value ?? "-";
        }
 
        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            return value ?? string.Empty;
        }
 
        public object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
    }
}