GeekDesk/Converts/DoubleToGridLength.cs

using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;

namespace GeekDesk.Converts
{
    class DoubleToGridLength : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            double val = double.Parse(value.ToString());
            return new GridLength(val);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            GridLength val = (GridLength)value;
            return double.Parse(val.ToString());
        }
    }
}