Get all Dependency Properties for a control

Question

I need to determine if a control on my window has a specific dependency property declared. Here is an example of a button with the DP DemandRole. That DP can be declared for various control types, not only buttons. I'm trying to enumerate all controls on a window and return only those which have the DP DemandRole declared.

<Button x:Name="_reset"
        sec:SecurityAction.DemandRole="Admin,Engineer,SuperUser,Technician,Supervisor" 
        Content="_Reset"
        Visibility="Visible"
        Command="{Binding ResetPasswordCommand}" />

I've can get Dependency Properties for a specific type, but that only returns properties for the type and does contain the DP I have defined for the controls.

static IEnumerable<FieldInfo> GetDependencyProperties(Type type)
{
        var dependencyProperties = type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static)
                                       .Where(p => p.FieldType.Equals(typeof(DependencyProperty)));
        return dependencyProperties;
    }

Any idea how I can get all DPs on a specific instance of a control?

Thanks,

Lance

So in short you need all the dependency property of the type and its base types? is it? — Sriram Sakthivel, Dec 22 '14 at 13:52

score 2 · Accepted Answer · edited May 23 '17 at 12:28

I found this code example from the Getting list of all dependency/attached properties of an Object page on the Visual Studio Forum. I can't guarantee that it will work but it 'appears' to have helped the original question author.

public static class DependencyObjectHelper
{
    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;
    }

    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;
    }
}

If these extension methods don't help, there are other examples on the linked page.

UPDATE >>>

I just found this question here on Stack Overflow that might also help:

How to enumerate all dependency properties of control?

Glad to help. In that case, I will close this question as a duplicate of the linked one as preferred on Stack Overflow. — Sheridan, Dec 22 '14 at 14:21

score 1 · Answer 2 · answered Dec 22 '14 at 13:54

Not tested, but I guess you need BindingFlags.FlattenHierarchy flag.

static IEnumerable<FieldInfo> GetDependencyProperties(Type type)
{
     var dependencyProperties = type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.FlattenHierarchy)
                                       .Where(p => p.FieldType.Equals(typeof(DependencyProperty)));
     return dependencyProperties;
}

If that doesn't work, you need to call type.BaseType.GetFields recursively till BaseType returns null and concat all the fields.

FlattenHierachy didn't return the DP, recursively going through the base types also didn't return the DP. — Lance, Dec 22 '14 at 14:18

Get all Dependency Properties for a control

2 Answers2