How to enumerate all dependency properties of control?

Question

I have some WPF control. For example, TextBox. How to enumerate all dependency properties of that control (like XAML editor does)?

Answer 1

Using reflection is not needed (and a bad idead IMHO) because the framework has already utility classes for this (but they're not obvious to find :-).

Here is an answer based on this article: Enumerate Bindings and the LocalValueEnumerator Structure

    public static IEnumerable<DependencyProperty> EnumerateDependencyProperties(this DependencyObject obj)
    {
        if (obj != null)
        {
            LocalValueEnumerator lve = obj.GetLocalValueEnumerator();
            while (lve.MoveNext())
            {
                yield return lve.Current.Property;
            }
        }
    }

Here is another answer based on this other article: Getting list of all dependency/attached properties of an Object that uses MarkupWriter.GetMarkupObjectFor Method.

    public static IEnumerable<DependencyProperty> EnumerateDependencyProperties(object element)
    {
        if (element != null)
        {
            MarkupObject markupObject = MarkupWriter.GetMarkupObjectFor(element);
            if (markupObject != null)
            {
                foreach (MarkupProperty mp in markupObject.Properties)
                {
                    if (mp.DependencyProperty != null)
                        yield return mp.DependencyProperty;
                }
            }
        }
    }

    public static IEnumerable<DependencyProperty> EnumerateAttachedProperties(object element)
    {
        if (element != null)
        {
            MarkupObject markupObject = MarkupWriter.GetMarkupObjectFor(element);
            if (markupObject != null)
            {
                foreach (MarkupProperty mp in markupObject.Properties)
                {
                    if (mp.IsAttached)
                        yield return mp.DependencyProperty;
                }
            }
        }
    }

Answer 2

public IList<DependencyProperty> GetAttachedProperties(DependencyObject obj)
{
    List<DependencyProperty> result = new List<DependencyProperty>();

    foreach (PropertyDescriptor pd in TypeDescriptor.GetProperties(obj,
        new Attribute[] { new PropertyFilterAttribute(PropertyFilterOptions.All) }))
    {
        DependencyPropertyDescriptor dpd =
            DependencyPropertyDescriptor.FromProperty(pd);

        if (dpd != null)
        {
            result.Add(dpd.DependencyProperty);
        }
    }

    return result;
}

Found here: http://social.msdn.microsoft.com/Forums/en/wpf/thread/580234cb-e870-4af1-9a91-3e3ba118c89c

Answer 3

You can use reflection, via the GetFields, method to find all the public static properties on TextBox. You can then use a Linq Where clause to filter these to any of type DependencyProperty:

  var flags = BindingFlags.Static |
              BindingFlags.FlattenHierarchy |
              BindingFlags.Public;
  var dependencyProperties = typeof(TextBox).GetFields(flags)
                     .Where(f => f.FieldType == typeof(DependencyProperty));

You can then transform this to a list of names via a Select:

  var dependencyProperties = typeof(TextBox).GetFields(flags)
                     .Where(f => f.FieldType == typeof(DependencyProperty))
                     .Select(dp => dp.Name);

Note: each name has a 'Property' suffix, you can of course remove this in the above Select clause if you like.

Answer 4

If you want name of the DependencyProperties of an element then you can do this:

    var results = from prop in typeof(element).GetFields() 
                  where prop.FieldType == typeof(DependencyProperty)
                  select prop.Name.Substring(0, prop.Name.Length - 8);

where 8 is length of the string "Property" which appears at the end of a dependency property!

Answer 5

Try

        var fieldInfos = typeof(TextBox).GetFields( BindingFlags.Public | BindingFlags.Static).Where(x=>x.FieldType == typeof(DependencyProperty));
        foreach (var fieldInfo in fieldInfos)
        {
            Console.WriteLine(fieldInfo.Name);
        }