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我正在制作一个小型媒体播放器,在其中将媒体文件添加到列表框中,该列表框用作媒体元素的播放列表。当我单击列表框中的项目时,它开始播放。我想做的是让媒体元素在当前结束后自动开始播放列表框中的下一首歌曲/视频。

以下是我将歌曲添加到列表框的方法:

        OpenFileDialog ofd = new OpenFileDialog();
        ofd.Multiselect = true;

        if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            foreach (string file in ofd.FileNames)   
            {
                FileInfo fileName = new FileInfo(file);                   
                listBox.Items.Add(fileName);
            }
        }

这是我如何单击列表框中的项目并开始播放的方法

        private void Button_Click(object sender, RoutedEventArgs e)
    {
        System.Windows.Controls.Button prevButton = player.Tag as System.Windows.Controls.Button;
        System.Windows.Controls.Button button = sender as System.Windows.Controls.Button;
        FileInfo fileInfo = button.DataContext as FileInfo;

        // If a file is playing, stop it

        if (prevButton != null)
        {
            player.Tag = null;
            player.Stop();
            prevButton.Background = Brushes.White;

            // if the one thats playing is the one that was clicked -> don't play it

            if (prevButton == button)
                return;
        }

        // Play the one that was clicked

        player.Tag = button;
        player.Source = new Uri(fileInfo.FullName);
        player.Play();
    }
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1 回答 1

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订阅 MediaElement 或 MediaPlayer 的 MediaEnded 事件,然后从列表框中选择下一项。

编辑

如何选择下一个项目:

  1. 当前项的索引在 ListBox 的 SelectedIndex 属性中
  2. 您可以通过将 1 添加到 SelectedIndex 并检查索引是否仍在边界内来获取下一项
  3. 将新索引存储在一个变量中,该变量将保持新索引直到播放项目或直接更改 SelectedIndex;这将更改 SelectedItem 并移动 ListBox 中的选择

以下代码未经编译器检查!

private int currentSongIndex = -1;

void Player_MediaEnded(object sender, EventArgs e)
{
    if(currentSongIndex == -1)
    {
        currentSongIndex = listBox.SelectedIndex;
    }
    currentSongIndex++;
    if(currentSongIndex < listBox.Items.Count)
    {
        player.Play(listBox.Items[currentSongIndex]);
    }
    else
    {
        // last song in listbox has been played
    }
}
于 2012-05-07T14:09:29.327 回答