Value converter that accepts multiple converters

ValueConverterGroup.cs

/// <summary>
/// Value converter group.
/// Takes multiple value converters.
/// </summary>
public class ValueConverterGroup : List<IValueConverter>, IValueConverter
{
    /// <summary>
    /// Modifies the source data before passing it to the target for display in the UI.
    /// </summary>
    /// <param name="value">The source data being passed to the target.</param>
    /// <param name="targetType">The type of the target property. This uses a different type depending on whether you're programming with Microsoft .NET or Visual C++ component extensions (C++/CX). See Remarks.</param>
    /// <param name="parameter">An optional parameter to be used in the converter logic.</param>
    /// <param name="language">The language of the conversion.</param>
    /// <returns>The value to be passed to the target dependency property.</returns>
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        return this.Aggregate(value, (current, converter) => converter.Convert(current, targetType, parameter, language));
    }

    /// <summary>
    /// Modifies the target data before passing it to the source object. This method is called only in TwoWay bindings.
    /// </summary>
    /// <param name="value">The target data being passed to the source.</param>
    /// <param name="targetType">The type of the target property, specified by a helper structure that wraps the type name.</param>
    /// <param name="parameter">An optional parameter to be used in the converter logic.</param>
    /// <param name="language">The language of the conversion.</param>
    /// <returns>The value to be passed to the source object.</returns>
    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        throw new NotImplementedException();
    }
}