StringToDoubleConverter.cs

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using System.Globalization;
using System.Windows.Data;
 
namespace Dreamine.UI.Wpf.Converters
{
    public sealed class StringToDoubleConverter : IValueConverter
    {
        public double Fallback { get; set; } = 0.0;

        public string? Format { get; set; }

        public bool UseInvariantCulture { get; set; } = true;

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var ci = UseInvariantCulture ? CultureInfo.InvariantCulture : (culture ?? CultureInfo.CurrentCulture);
 
            if (value is string s)
            {
                if (double.TryParse(s, NumberStyles.Float | NumberStyles.AllowLeadingSign, ci, out var d))
                    return d;
 
                // Common culture confusion fix: replace ',' with '.' if using invariant culture
                if (UseInvariantCulture && double.TryParse(s.Replace(',', '.'), NumberStyles.Float | NumberStyles.AllowLeadingSign, CultureInfo.InvariantCulture, out d))
                    return d;
            }
            else if (value is IConvertible c)
            {
                try { return System.Convert.ToDouble(c, ci); }
                catch { /* ignored */ }
            }
 
            return Fallback;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var ci = UseInvariantCulture ? CultureInfo.InvariantCulture : (culture ?? CultureInfo.CurrentCulture);
 
            double d = value switch
            {
                double v => v,
                float v => v,
                decimal v => (double)v,
                string s when double.TryParse(s, NumberStyles.Float | NumberStyles.AllowLeadingSign, ci, out var vv) => vv,
                _ => Fallback
            };
 
            var fmt = string.IsNullOrWhiteSpace(Format) ? "G" : Format!;
            return d.ToString(fmt, ci);
        }
    }
}