<Window

         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

         xmlns:local="clr-namespace:WPF_Nav"

         xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol" xmlns:dxwui="http://schemas.devexpress.com/winfx/2008/xaml/windowsui" x:Class="WPF_Nav.MainWindow"

         mc:Ignorable="d"

         Title="MainWindow" Height="" Width="" WindowStyle="None">

     <Grid Name="Main_Grid">

         <Grid.RowDefinitions>

             <RowDefinition Height=""></RowDefinition>

             <RowDefinition Height=""></RowDefinition>

             <RowDefinition Height=""></RowDefinition>

             <RowDefinition Height=""></RowDefinition>

         </Grid.RowDefinitions>

         <Grid Name="Title" Grid.Row="">

             <Grid.ColumnDefinitions>

                 <ColumnDefinition Width=""></ColumnDefinition>

                 <ColumnDefinition Width=""></ColumnDefinition>

                 <ColumnDefinition Width=""></ColumnDefinition>

                 <ColumnDefinition Width=""></ColumnDefinition>

             </Grid.ColumnDefinitions>

             <Button Grid.Column="" HorizontalAlignment="Center" Width="" Height="" Click="Button_Click" Margin="16,0,0,0" >关闭</Button>

         </Grid>

         <Grid Name="Movie" Grid.Row="">

             <MediaElement Stretch="Fill" LoadedBehavior="Manual" Name="QS_Movie" MediaOpened="Element_MediaOpened" Loaded="QS_Movie_Loaded" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"></MediaElement>

             <Button Name="LeftButton" Width="" Height="" HorizontalAlignment="Left" VerticalAlignment="Center" Click="Left_Click">上一个</Button>

             <Button Name="RightButton" Width="" Height="" HorizontalAlignment="Right" VerticalAlignment="Center" Click="Right_Click">下一个</Button>

         </Grid>

         <Grid Name="Control_Progress" Grid.Row="">

             <Slider Height="" Width="" Name="timelineSlider" VerticalAlignment="Center"  PreviewMouseLeftButtonDown="timelineMDown"  PreviewMouseLeftButtonUp="timelineMUp" BorderThickness="0,5,0,0" ></Slider>

         </Grid>

         <Grid Name="Movie_Control" Grid.Row="" Margin="0,0,0,0">

             <Grid.ColumnDefinitions>

                 <ColumnDefinition Width=""></ColumnDefinition>

                 <ColumnDefinition Width=""></ColumnDefinition>

                 <ColumnDefinition Width=""></ColumnDefinition>

                 <ColumnDefinition Width=""></ColumnDefinition>

             </Grid.ColumnDefinitions>

             <StackPanel Grid.Column="" Orientation="Horizontal" HorizontalAlignment="Center">

                 <Button Height="" Width="" x:Name="Play" Click="Play_Click" Margin="20,0">播放</Button>

                 <Button Height="" Width="" x:Name="Pause" Click="Pause_Click" Margin="20,0">暂停</Button>

             </StackPanel>

             <Slider Height="" Width="" Name="Volunme" Minimum="" Maximum="" Value="{Binding ElementName=QS_Movie,Path=Volume,Mode=TwoWay}" Grid.Column="" HorizontalAlignment="Left" Margin="0,5,0,0" ></Slider>

             <Button Height="" Width="" Name="Horn" Grid.Column="" HorizontalAlignment="Right" Margin="0,13">音量</Button>

         </Grid>

     </Grid>

 </Window>

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows;

 using System.Windows.Controls;

 using System.Windows.Data;

 using System.Windows.Documents;

 using System.Windows.Input;

 using System.Windows.Media;

 using System.Windows.Media.Imaging;

 using System.Windows.Navigation;

 using System.Windows.Shapes;

 using System.Windows.Threading;

 namespace WPF_Nav

 {

     /// <summary>

     /// MainWindow.xaml 的交互逻辑

     /// </summary>

     public partial class MainWindow : Window

     {

         DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer(); // 定义一个DT

         public MainWindow()

         {

             InitializeComponent();

         }

         private void Play_Click(object sender, RoutedEventArgs e)

         {

             QS_Movie.Play();

         }

         private void Pause_Click(object sender, RoutedEventArgs e)

         {

             QS_Movie.Pause();

         }

         private void Element_MediaOpened(object sender, EventArgs e)

         {

             timelineSlider.Maximum = QS_Movie.NaturalDuration.TimeSpan.TotalMilliseconds;  //设置slider最大值

             int sec = (int)QS_Movie.NaturalDuration.TimeSpan.TotalSeconds;

             dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick); //超过计时间隔时发生

             dispatcherTimer.Interval = new TimeSpan(, , , , ); //DT间隔

             dispatcherTimer.Start(); //DT启动

         }

         private void dispatcherTimer_Tick(object sender, EventArgs e)

         {

             timelineSlider.Value = QS_Movie.Position.TotalMilliseconds; //slider滑动值随播放内容位置变化

         }

         private void timelineMDown(object sender, EventArgs e)

         {

             dispatcherTimer.Stop();

         }

         private void timelineMUp(object sender, EventArgs e)

         {

             QS_Movie.Position = new TimeSpan(, , , , (int)timelineSlider.Value);

             dispatcherTimer.Start();

             QS_Movie.Play();

         }

         private void QS_Movie_Loaded(object sender, RoutedEventArgs e)

         {

             QS_Movie.Source = new Uri(@"E:\Test\WPFTest\Sources\preview.mp4");

             QS_Movie.Play();

             System.Threading.Thread.Sleep();

             QS_Movie.Pause();

         }

         private void Left_Click(object sender, RoutedEventArgs e)

         {

             QS_Movie.Source = new Uri(@"E:\Test\WPFTest\Sources\preview1.mp4");

             QS_Movie.Play();

             System.Threading.Thread.Sleep();

             QS_Movie.Pause();

         }

         private void Right_Click(object sender, RoutedEventArgs e)

         {

             QS_Movie.Source = new Uri(@"E:\Test\WPFTest\Sources\preview2.mp4");

             QS_Movie.Play();

             System.Threading.Thread.Sleep();

             QS_Movie.Pause();

         }

         private void Button_Click(object sender, RoutedEventArgs e)

         {

             this.Close();

         }

     }

 }