使用enum作为WPF中的依赖项属性

public enum ButtonState
{
    Normal,
    Hover,
    Pressed
}

public class CustomButton : Button
{
    public static readonly DependencyProperty ButtonStateProperty =
        DependencyProperty.Register("ButtonState", typeof(ButtonState), typeof(CustomButton),
            new FrameworkPropertyMetadata(ButtonState.Normal, FrameworkPropertyMetadataOptions.AffectsRender));

    public ButtonState ButtonState
    {
        get { return (ButtonState)GetValue(ButtonStateProperty); }
        set { SetValue(ButtonStateProperty, value); }
    }
}