问在MVVM模式中转换值(kg到lbs)

EN

    private IConverter<Double, Double> weightConverter = new KgToLbsConverter();
    private double _weight;
    public double Weight
    {
        get
        {
            return weightConverter.ConvertFrom(_weight);
        }

        set
        {
            _weight = weightConverter.ConvertTo(value);
            RaisePropertyChanged(() => Weight);
        }
    }

    /// <summary>
    /// Provides a simple converter contract.
    /// </summary>
    /// <typeparam name="T">The source Type</typeparam>
    /// <typeparam name="R">The target Type.</typeparam>
    public interface IConverter<T, R>
    {
        R ConvertFrom(T value);
        T ConvertTo(R value);
    }

    /// <summary>
    /// Provides a converter to change Kg to Lbs and vice versa
    /// </summary>
    public class KgToLbsConverter : IConverter<Double, Double>
    {
        /// <summary>
        /// From Kg to Lbs.
        /// </summary>
        /// <param name="value">The weight in Kg.</param>
        /// <returns>The weight in Lbs.</returns>
        public double ConvertFrom(double value)
        {
            return value / 2.2;
        }

        /// <summary>
        /// From Lbs to Kg.
        /// </summary>
        /// <param name="value">The weight in Lbs.</param>
        /// <returns>The weight in Kg.</returns>
        public double ConvertTo(double value)
        {
            return value * 2.2;
        }
    }