x01.MediaPlayer

一个很小很小的 Music、Video 播放器，有效代码不足 20 行，却能够 Play、Pause、Stop 和调整播放位置。

其界面代码如下：

<Window x:Class="x01.WpfTest.MediaWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Media Player by x01" WindowStartupLocation="CenterScreen" 

        Width="650" Height="450" >
    <DockPanel>
        <DockPanel.Background>
            <RadialGradientBrush>
                <GradientStop Color="#FFD7EEEC" Offset="0"/>
                <GradientStop Color="#FF89AAA7" Offset="1"/>
                <GradientStop Color="#FF5A8984" Offset="0.365"/>
                <GradientStop Color="#FFA9E6DF" Offset="0.585"/>
                <GradientStop Color="#FF16897F" Offset="0.798"/>
            </RadialGradientBrush>
        </DockPanel.Background>
        <StackPanel DockPanel.Dock="Bottom" Height="60" Orientation="Horizontal" 
                    HorizontalAlignment="Center">
            <Image Name="imgPlay" Source="Resources/play.png" ToolTip="Play" Margin="5" />
            <Image Name="imgPause" Source="Resources/pause.png" ToolTip="Pause" Margin="5" />
            <Image Name="imgStop" Source="Resources/stop.png"  ToolTip="Stop"  Margin="5" />
            <Slider Name="sliderPos" Width="250"  VerticalAlignment="Center" Margin="5" />
            <Button Name="btnSelect" Content="_Select" 
                    ToolTip="Select Music(mp3) or Video(mp4)" Width="100" Margin="10" FontSize="16" />
        </StackPanel>
        <MediaElement x:Name="media" LoadedBehavior="Manual" Margin="0 2 0 0"
                      UnloadedBehavior="Stop" />
    </DockPanel>
</Window>

主代码如下：

  public partial class MediaWindow : Window
    {
        OpenFileDialog _dlgOpen = new OpenFileDialog();

        public MediaWindow()
        {
            InitializeComponent();

            _dlgOpen.Filter = "MP4(*.mp4)|*.mp4|WMV(*.wmv)|*.wmv|MP3(*.mp3)|*.mp3|All File(*.*)|*.*";

            media.MediaOpened += (s, e) =>
                sliderPos.Maximum = media.NaturalDuration.TimeSpan.TotalMilliseconds;

            media.MediaEnded += (s, e) => media.Stop();

            sliderPos.ValueChanged += (s, e) =>
                {
                    media.Position = new TimeSpan(0, 0, 0, 0, (int)sliderPos.Value);
                    if (sliderPos.Value < sliderPos.Maximum && sliderPos.Value != 0)
                    {
                        media.Play();
                    }
                };

            imgPlay.MouseDown += (s, e) => media.Play();
            imgPause.MouseDown += (s, e) => media.Pause();
            imgStop.MouseDown += (s, e) => { media.Stop(); sliderPos.Value = 0; };

            btnSelect.Click += (s, e) =>
                {
                    bool ok = (bool)_dlgOpen.ShowDialog();
                    if (ok)
                    {
                        string file = _dlgOpen.FileName;
                        this.Title = file.Substring(file.LastIndexOf('\\') + 1);
                        media.Source = new Uri(file);
                        media.Play();
                    }
                };
        }
    }

当然，通过 Reflector 反编译，也是一个不错的选择。其程序 MediaPlayer.exe 放在 x01.Download 中。

需要说明的是，MediaElement 的 LoadedBehavior="Manual" 方可。