Get all dependency and attached proprties

DependencyObjectExtensions.cs

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

public static class DependencyObjectExtensions
{
    public static List<DependencyProperty> GetDependencyProperties(this DependencyObject element)
    {
        var properties = new List<DependencyProperty>();
        var markupObject = MarkupWriter.GetMarkupObjectFor(element);
        foreach (var mp in markupObject.Properties)
        {
            if (mp.DependencyProperty != null)
            {
                properties.Add(mp.DependencyProperty);
            }
        }
        return properties;
    }

    public static List<DependencyProperty> GetAttachedProperties(this DependencyObject element)
    {
        var attachedProperties = new List<DependencyProperty>();
        var markupObject = MarkupWriter.GetMarkupObjectFor(element);
        foreach (var mp in markupObject.Properties)
        {
            if (mp.IsAttached)
            {
                attachedProperties.Add(mp.DependencyProperty);
            }
        }
        return attachedProperties;
    }
}