Public ReadOnly Property ThemeDictionaryLocation As ResourceDictionaryLocation

Dim instance As ThemeInfoAttribute
Dim value As ResourceDictionaryLocation

value = instance.ThemeDictionaryLocation

public ResourceDictionaryLocation ThemeDictionaryLocation { get; }

public:
property ResourceDictionaryLocation ThemeDictionaryLocation {
    ResourceDictionaryLocation get ();
}

public function get ThemeDictionaryLocation () : ResourceDictionaryLocation

You cannot set this property in XAML.