媒体播放器不会播放listView中的下一首歌曲，但是当我显示带有歌曲URL的消息框时，歌曲会播放

Question

我有这个代码

 If AxWindowsMediaPlayer1.playState = WMPLib.WMPPlayState.wmppsStopped Then
            tempInt = gen.Next(0, listTracks.Items.Count - 1)
            currentTrack = tempInt
            If tempInt = playedBefore Then
                tempInt = gen.Next(0, listTracks.Items.Count - 1)
                currentTrack = tempInt
                AxWindowsMediaPlayer1.URL = listTracks.Items(tempInt)
            'here > MessageBox.Show(AxWindowsMediaPlayer1.URL)
                AxWindowsMediaPlayer1.Ctlcontrols.play()
                playedBefore = currentTrack
            Else
                currentTrack = tempInt
                AxWindowsMediaPlayer1.URL = listTracks.Items(tempInt)
            'here > MessageBox.Show(AxWindowsMediaPlayer1.URL)

                AxWindowsMediaPlayer1.Ctlcontrols.play()
                playedBefore = currentTrack
            End If

当歌曲结束时，下一首歌曲不播放。但是当我在消息框中显示歌曲的网址时，它将播放（标记为代码）