wp7 -MediaElement播放

namespace TestControl.Test_Control
{
    public partial class Control_Slide : PhoneApplicationPage
    {
        public Control_Slide()
        {
            InitializeComponent();
            //定义多媒体流可用并被打开时触发的事件
            myMediaElement.MediaOpened += new RoutedEventHandler(myMediaElement_MediaOpened);
            //定义多媒体停止时触发的事件
            myMediaElement.MediaEnded += new RoutedEventHandler(myMediaElement_MediaEnded);
            //定义多媒体播放状态改变时触发的事件
            myMediaElement.CurrentStateChanged += new RoutedEventHandler(myMediaElement_CurrentStateChanged);
            //设置多媒体控件的网络视频资源
            myMediaElement.Source = new Uri("Hair.mp3", UriKind.Relative);

            DispatcherTimer tmr = new DispatcherTimer();//创建计时器            
            tmr.Interval = TimeSpan.FromSeconds(1);//TimeSpan 结构  表示一个时间间隔。
            tmr.Tick += OnTimerTick;//DispatcherTimer.Tick 事件 超过计时器间隔时发生。
            tmr.Start();//计时器开始
        }
        void OnTimerTick(object sender, EventArgs e)
        {
            UpdateClock();
        }
        void UpdateClock()
        {
            slider1.Value = (int)myMediaElement.Position.TotalSeconds;
        }

        private bool _sliderpressed = false;

        void videoMediaElement_MediaEnded(object sender, RoutedEventArgs e)
        {
            //StopTimer();
            slider1.Value = 0.0;
        }
        //视频状态改变时的处理事件
        void myMediaElement_CurrentStateChanged(object sender, RoutedEventArgs e)
        {
            if (myMediaElement.CurrentState == MediaElementState.Playing)
            {
                if (!_sliderpressed)
                {
                    //_timer.Stop();
                }
                else
                {
                    //_timer.Start();
                }
            }
            if (myMediaElement.CurrentState == MediaElementState.Paused)
            {
                //_timer.Stop();
            }
            if (myMediaElement.CurrentState == MediaElementState.Stopped)
            {
                //_timer.Stop();
                slider1.Value = 0;
            }
        }
        //多媒体停止时触发的事件
        void myMediaElement_MediaEnded(object sender, RoutedEventArgs e)
        {
            _sliderpressed = false;
            //停止播放
            myMediaElement.Stop();
        }
        //多媒体流可用并被打开时触发的事件
        void myMediaElement_MediaOpened(object sender, RoutedEventArgs e)
        {
            slider1.Maximum = myMediaElement.NaturalDuration.TimeSpan.TotalSeconds;
            _sliderpressed = true;
        }
        private void slider1_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            textblock.Text=slider1.Value.ToString();
        }
        //定义获取时间函数，返回值为字符串
        public string getTime(int t)
        {
            //计算小时,用毫秒总数除以(1000*60*24),后去掉小数点
            int hour = t / (1000 * 60 * 24);
            //计算分钟,用毫秒总数减去小时乘以(1000*60*24)后,除以(1000*60),再去掉小数点
            int min = (t - hour * (1000 * 60 * 24)) / (1000 * 60);
            //同上
            int sec = (t - hour * (1000 * 60 * 24) - min * (1000 * 60)) / 1000;
            int msec = t - hour * (1000 * 60 * 24) - min * (1000 * 60) - sec * 1000;
            //拼接字符串
            string timeString = hour.ToString() + ":" + min.ToString() + ":" + sec.ToString() + ":" + msec.ToString();
            return timeString;
        }
        private double SliderFrequency(TimeSpan timevalue)
        {
            double stepfrequency = -1;
            double absvalue = (int)Math.Round(timevalue.TotalSeconds, 1);
            stepfrequency = (int)(Math.Round(absvalue / 100));
            if (timevalue.TotalMinutes >= 10 && timevalue.TotalMinutes < 30)
            {
                stepfrequency = 10;
            }
            else if (timevalue.TotalMinutes >= 30 && timevalue.TotalMinutes < 60)
            {
                stepfrequency = 30;
            }
            else if (timevalue.TotalHours >= 1)
            {
                stepfrequency = 60;
            }
            if (stepfrequency == 0) stepfrequency += 1;
            if (stepfrequency == 1)
            {
                stepfrequency = absvalue / 100;
            }
            return stepfrequency;
        }
        //播放视频菜单事件
        private void Play_Click(object sender, EventArgs e)
        {
            myMediaElement.Play();
        }
        //暂停视频菜单事件
        private void Pause_Click(object sender, EventArgs e)
        {
            myMediaElement.Pause();
        }
        //停止视频菜单事件
        private void Stop_Click(object sender, EventArgs e)
        {
            myMediaElement.Stop();
        }
    }
}