#163 – Constructing FrameworkPropertyMetadata

When you look at the metadata for a dependency property that is storing its metadata as an instance of FrameworkPropertyMetadata, you’ll see a series of boolean properties.

As a convenience, when constructing an instance of FrameworkPropertyMetadata, you don’t have to pass all of these boolean values into the constructor individually.  Instead, the constructor accepts a flags parameter that is a logical OR of a series of enumeration values.  The individual enumeration values come from the FrameworkPropertyMetadataOptions enum.

        // Register ZHeightProperty dependency property
        private static FrameworkPropertyMetadata meta = new FrameworkPropertyMetadata(1,   // default = 1
            FrameworkPropertyMetadataOptions.AffectsArrange | FrameworkPropertyMetadataOptions.AffectsMeasure |
            FrameworkPropertyMetadataOptions.AffectsParentArrange | FrameworkPropertyMetadataOptions.AffectsParentMeasure |
            FrameworkPropertyMetadataOptions.BindsTwoWayByDefault);

        public static readonly DependencyProperty ZHeightProperty =
            DependencyProperty.Register("ZHeightProperty", typeof(int), typeof(ThreeDButton), meta);