ShrlAlgoToolkit/WPFluent/Converters/DoubleToPercentageConverter.cs

using System;
using System.Linq;
using System.Windows.Data;

namespace WPFluent.Converters;

public class DoubleToPercentageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var d = (double)value;
        return Math.Round(d * 100, MidpointRounding.AwayFromZero);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var str = value.ToString().TrimEnd('%');
        if(double.TryParse(str, out var d))
        {
            return d / 100;
        }
        return Binding.DoNothing;
    }
}