Determine if a WPF DependencyProperty value is inherited

DependencyPropertyHelper.GetValueSource will give you a ValueSource, which includes a property for retrieving the BaseValueSource. The BaseValueSource enumeration tells you where the DependencyProperty is getting its value from, such as inherited from parent, set via a style or set locally.

Updated after more digging

There is a ReadLocalValue method which is stupidly Read instead of Get so hard to spot in intellisense. (I think Apress' WPF book had a note about this actually.) It will return UnsetValue if the value hasn't been set.

if (ReadLocalValue(Control.DataContextProperty) !=     DependencyProperty.UnsetValue){    // Data context was set locally.}

If you for some reason need to get all locally set properties, you can use LocalValueEnumerator.

LocalValueEnumerator enumerator = GetLocalValueEnumerator();while (enumerator.MoveNext()){    if (enumerator.Current.Property == Control.DataContextProperty)    {        // DataContext was set locally    }}

And these two methods really make me wonder. Read instead of Get in the ReadLocalValue and a collection which you cannot iterate with foreach in GetLocalValueEnumerator. It's like .Net has these nice standard things which the WPF team just decided to ignore.