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メディア要素のプレイリストとして機能するリストボックスにメディアファイルを追加する小さなメディアプレーヤーを作成しています。リストボックス内のアイテムをクリックすると、再生が開始されます。私がやりたいことは、メディア要素が現在の終了後にリストボックス内の次の曲/ビデオの再生を自動的に開始するようにすることです。

リストボックスに曲を追加する方法は次のとおりです。

        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);
            }
        }

リストボックス内のアイテムをクリックして再生を開始する方法は次のとおりです

        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 に答える 1

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Subscribe to the MediaEnded event of the MediaElement or MediaPlayer and then pick the next item from the listbox.

EDIT

How to pick the next item:

  1. The current item's index is in the SelectedIndex property of the ListBox
  2. You can get the next item by adding 1 to the SelectedIndex and checking if the index is still within bounds
  3. Store the new index in a variable that will keep the new index until the item has been played or change the SelectedIndex directly; this will change the SelectedItem and move the selection in the ListBox

The code below hasn't been checked by a compiler!

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 に答える