Get All The Attached DPs/DPs for An Object?

Someone asks on MSDN forum on how to get a list of all dependency/attached properties of an Object, Douglas Stockwell responds to it with an awesome reflection code on how to get all the dependency/attached properties defined by built-in WPF library classes, but his solution doesn't solve the original poster's problem, after examining the issue for a bit, I come up with my solution:

using System;
using System.Windows;
using System.Collections.Generic;
using System.Windows.Markup;
using System.Windows.Markup.Primitives;

namespace Sheva.Windows.Markup
{
    public static class MarkupHelper
    {
        /// <summary>
        /// Gets a list of locally applied DPs on an element.
        /// </summary>
        public static List<DependencyProperty> GetDependencyProperties(Object element)
        {
            List<DependencyProperty> properties = new List<DependencyProperty>();
            MarkupObject markupObject = MarkupWriter.GetMarkupObjectFor(element);
            if (markupObject != null)
            {
                foreach (MarkupProperty mp in markupObject.Properties)
                {
                    if (mp.DependencyProperty != null)
                    {
                        properties.Add(mp.DependencyProperty);
                    }
                }
            }

            return properties;
        }

        /// <summary>
        /// Gets a list of locally applied attached DPs on an element.
        /// </summary>
        public static List<DependencyProperty> GetAttachedProperties(Object element)
        {
            List<DependencyProperty> attachedProperties = new List<DependencyProperty>();
            MarkupObject markupObject = MarkupWriter.GetMarkupObjectFor(element);
            if (markupObject != null)
            {
                foreach (MarkupProperty mp in markupObject.Properties)
                {
                    if (mp.IsAttached)
                    {
                        attachedProperties.Add(mp.DependencyProperty);
                    }
                }
            }

            return attachedProperties;
        }
    }
}

As an aside, I really want to give my special thanks to Douglas Stockwell, his nifty VSPaste plugin for Live Writer makes my blogging experience much easier.