播放多个文件

Question

This is how my music player looks like

大家好，最近我针对Visual Studio的WPF音乐播放器项目。 完成所有基本功能后，现在我想创建一个包含多个文件的文件播放列表。

所以，当它运行时，首先，我点击打开文件按钮，选择一个文件（S）。然后，它将被加载到列表框中。要播放该歌曲，我可以选择在列表框中双击该歌曲，或在点击播放按钮之后点击该歌曲。当我的歌曲选择改变时，“正在播放”下的lblName信息发生变化。

我曾尝试使用Google和它的代码（有些复制和修改），以及文件在我的列表框加载，但它不能在所有播放。

<Window x:Class="WPFplayer.MainWindow" 
    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:WPFplayer" 
    mc:Ignorable="d" 
    Title="WPF Music Player" Height="380.436" Width="507.483"> 
<Grid Margin="0,0,2,0" Height="350" VerticalAlignment="Top"> 
    <Grid.Background> 
     <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0" SpreadMethod="Repeat"> 
      <GradientStop Color="Black" Offset="1"/> 
      <GradientStop Color="#FFF3FF00" Offset="0.6"/> 
     </LinearGradientBrush> 
    </Grid.Background> 
    <Button x:Name="btnOpen" Content="Open File..." HorizontalAlignment="Left" Margin="17,162,0,0" VerticalAlignment="Top" Width="75" Click="btnOpen_Click"/> 
    <Button x:Name="btnPlay" Content="Play" HorizontalAlignment="Left" Margin="131,154,0,0" VerticalAlignment="Top" Width="75" Click="btnPlay_Click" Height="30"/> 
    <Button x:Name="btnPause" Content="Pause" HorizontalAlignment="Left" Margin="211,154,0,0" VerticalAlignment="Top" Width="75" Click="btnPause_Click" Height="30"/> 
    <Button x:Name="btnStop" Content="Stop" HorizontalAlignment="Left" Margin="291,154,0,0" VerticalAlignment="Top" Width="75" Click="btnStop_Click" Height="30"/> 
    <Label x:Name="lblTime" Content="-----" HorizontalAlignment="Left" Margin="371,121,0,0" VerticalAlignment="Top" RenderTransformOrigin="-0.471,0.295"/> 
    <Label x:Name="lblBiasa" Content="Now Playing :" HorizontalAlignment="Left" Margin="17,68,0,0" VerticalAlignment="Top" FontWeight="Bold"/> 
    <Label x:Name="lblName" Content="(No Song...)" HorizontalAlignment="Left" Margin="17,94,0,0" VerticalAlignment="Top"/> 
    <Slider x:Name="sliProgress" Thumb.DragStarted="sliProgress_DragStarted" Thumb.DragCompleted="sliProgress_DragCompleted" ValueChanged="sliProgress_ValueChanged" HorizontalAlignment="Left" Margin="17,125,0,0" VerticalAlignment="Top" Width="354"/> 
    <Slider x:Name="sliderVol" Value="0.5" Minimum="0" HorizontalAlignment="Left" Margin="436,92,0,0" VerticalAlignment="Top" Width="33" TickPlacement="BottomRight" Cursor="Arrow" Orientation="Vertical" Height="121" ValueChanged="sliderVol_ValueChanged" TickFrequency="0.1" SmallChange="0.01" LargeChange="0.1" Maximum="1"/> 
    <Label x:Name="label" Content="MUSIC PLAYER" HorizontalAlignment="Left" Margin="173,10,0,0" VerticalAlignment="Top" FontWeight="Bold" FontSize="22"/> 
    <Label x:Name="label1" Content="Volume" HorizontalAlignment="Left" Margin="423,64,0,0" VerticalAlignment="Top" FontWeight="Bold"/> 
    <CheckBox x:Name="chkKaraoke" Content="Karaoke" HorizontalAlignment="Left" Margin="286,78,0,0" VerticalAlignment="Top"/> 
    <CheckBox x:Name="checkBox" Content="Bass Boost" HorizontalAlignment="Left" Margin="286,99,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.743,0.625"/> 
    <ListBox x:Name="listBox" HorizontalAlignment="Left" Height="139" Margin="17,189,0,0" VerticalAlignment="Top" Width="388" SelectionChanged="listBox_SelectionChanged" MouseDoubleClick="listBox_MouseDoubleClick"/> 
</Grid> 

string[] files; 

private void btnOpen_Click(object sender, RoutedEventArgs e) 
{ 
    OpenFileDialog ofd = new OpenFileDialog(); 
    ofd.AddExtension = true; 
    ofd.DefaultExt = "*.*"; 
    ofd.Filter = "All files (*.*)|*.*"; 
    ofd.Multiselect = true; 
    ofd.ShowDialog(); 

    files = ofd.SafeFileNames; 

    foreach (string song in files) 
    { 
    if (!listBox.Items.Contains(song)) 
    { 
     listBox.Items.Add(song); 
    } 
    } 

    foreach (var item in listBox.SelectedItems) 
    {  
    lblName.Content = ofd.SafeFileName; 
    mediaPlayer.Play(); 
    } 

    DispatcherTimer timer = new DispatcherTimer(); 
    timer.Interval = new TimeSpan(0, 0, 1); 
    timer.Tick += timer_Tick; 
    timer.Start(); 
} 

private void btnPlay_Click(object sender, RoutedEventArgs e) 
{ 
    foreach (var item in listBox.SelectedItems) 
    {  
    mediaPlayer.Play(); 
    } 
} 

private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e) 
{ 
    lblName.Content = (listBox.SelectedValue).ToString(); 
} 

private void listBox_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e) 
{ 
    lblName.Content = (listBox.SelectedValue).ToString();  
    mediaPlayer.Play(); 
} 

我想知道的事情，我在该代码错过。我应该添加一个事件到我的列表框吗？

为了您的帮助，我想说谢谢。

Answer 1

也许你忘了将它张贴。但它看起来并不像你甚至告诉MediaPlayer要播放什么文件。你所做的只是获取歌曲路径，并告诉MediaPlayer播放 - 而不会给它播放什么文件。

假设列表框项目是歌曲路径的字符串，你会想要这个。

mediaPlayer.Open(new Uri(item)); //item == song path(Including extension, i.e. .mp3) 
    mediaPlayer.Play(); 

然而，似乎你正在使用.SafeFileName为好，这将使这个问题。因此，如果我们要直接从列表框字符串中设置歌曲，您可能也会这样做。

files = ofd.FileNames; 

Answer 2

非常感谢@Toskr的回答和纠正！

我修改了我的代码，我会分享给任何需要它的人。

private void btnOpen_Click(object sender, RoutedEventArgs e) 
    { 
     OpenFileDialog ofd = new OpenFileDialog(); 
     ofd.AddExtension = true; 
     ofd.DefaultExt = "*.*"; 
     ofd.Filter = "All files (*.*)|*.*"; 
     ofd.Multiselect = true; 
     ofd.ShowDialog(); 

     files = ofd.FileNames; 

     foreach (string song in files) 
     { 
      if (!listBox.Items.Contains(song)) 
      { 
       listBox.Items.Add(song); 
      } 
     } 

     DispatcherTimer timer = new DispatcherTimer(); 
     timer.Interval = new TimeSpan(0, 0, 1); 
     timer.Tick += timer_Tick; 
     timer.Start(); 
    } 

    private void btnPlay_Click(object sender, RoutedEventArgs e) 
    { 
     lblName.Content = (listBox.SelectedValue).ToString(); 
     mediaPlayer.Open(new Uri((listBox.SelectedValue).ToString())); 
     mediaPlayer.Play(); 
    } 

    private void listBox_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e) 
    { 
     lblName.Content = (listBox.SelectedValue).ToString(); 
     mediaPlayer.Open(new Uri((listBox.SelectedValue).ToString())); 
     mediaPlayer.Play(); 
    }