Binding to element in WPF: can the Path expression do math?

Question

I\'m trying to bind a control to the parent\'s Height/width property using ElementName and a Path. However, I don\'t want to bind to the actual height, but to exact

Answer 1

@Rachel's MathConverter worked great for me, however I switched out the expression parsing and just left that bit to NCalc. That way I didn't have to worry about operator precedence.

using NCalc;

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

namespace MyProject.Utilities.Converters
{
    public class MathConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo     culture)
        {
            // Parse value into equation and remove spaces
            string expressionString = parameter as string;
            expressionString = expressionString.Replace(" ", "");
            expressionString = expressionString.Replace("@VALUE", value.ToString());

            return new Expression(expressionString).Evaluate();
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}