实现Metro中MediaElement的进度条

 最近开始做Metro的项目，有很多的东西都不是很清楚，相信有很多搞Metro项目的开发人员也在不断的摸索中前行。
 今天要研究的是在Metro系统自带的MediaElement（mediaplay发现有很多问题，故弃之不研究）实现进度条的同步，之前有看到网上说通过定时检测多媒体当前的时间来刷新进度条，后来研究了一下wpf（Metro很多的东西都是借鉴wpf的）的依赖属性，发现可以将slide的value和mediaelement的position属性关联，所以实现进度条的同步就很简单了，以下是代码，先贴出来。现在项目比较紧，有时间再整理。

private void BindingPosition()        {            //bing MediaElement.Position to MediaPositionProperty            Binding binding = new Binding            {                Source = myMediaElement,                Path = new PropertyPath("Position"),            };            BindingOperations.SetBinding(this, VideoDisplayPage.MediaPositionProperty, binding);            //following is same            //Binding binding = new Binding();            //binding.Path = new PropertyPath("Position");            //binding.Source = myMediaElement;        }        private void ClearBinding()        {            //Clear the binding        }        public TimeSpan MediaPosition        {            get { return (TimeSpan)GetValue(MediaPositionProperty); }            set { SetValue(MediaPositionProperty, value); }        }        public static readonly DependencyProperty MediaPositionProperty =            DependencyProperty.Register("MediaPosition", typeof(Object), typeof(VideoDisplayPage), new PropertyMetadata(null, new PropertyChangedCallback(MediaPositionChangeCallback)));        private static void MediaPositionChangeCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)        {            //throw new NotImplementedException();            if (d.GetType() == typeof(VideoDisplayPage))            {                VideoDisplayPage play = (VideoDisplayPage)d;                TimeSpan span = (TimeSpan)e.NewValue;                play.SetMediaPlayProgressPosition(span);            }        }