Question

I want to be able to apply a style at runtime to an object ONLY if the current style is the default style. I don’t want to override any user defined styles. Anyone know how to do this?

Answer 1

It appears you can do it this way:

DependencyPropertyHelper.GetValueSource(     someControl, FrameworkElement.StyleProperty).BaseValueSource      == BaseValueSource.Default; 

You can wrap that up in an extension method like this:

static public bool HasDefaultStyle(this FrameworkElement item) {     return DependencyPropertyHelper.GetValueSource(         item, FrameworkElement.StyleProperty).BaseValueSource          == BaseValueSource.Default; } 

Then you can just call someControl.HasDefaultStyle().

Also, have a look at this article: Default Templates in WPF