'播放
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If Me.ListView1.SelectedItems.Count < 1 Then
            MessageBox.Show("请选择歌曲！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information)
            Exit Sub
        End If
        Dim MyPos As Int16 = Me.ListView1.SelectedItems(0).Index
        Dim MyFileName As String = Me.ListView1.Items(MyPos).SubItems(3).Text
        Me.AxMediaPlayer1.FileName = MyFileName
        Me.AxMediaPlayer1.Play()
    End Sub
  
   
    Private Sub btn7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn7.Click
        If Me.ListView1.SelectedItems.Count < 1 Then
            MessageBox.Show("请选择歌曲！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information)
            Exit Sub
        End If
        Dim MyPos As Int16 = Me.ListView1.SelectedItems(0).Index
        Dim MyFileName As String = Me.ListView1.Items(MyPos).SubItems(3).Text
        Me.AxMediaPlayer1.FileName = MyFileName
        Me.AxMediaPlayer1.Play()
    End Sub

以上两个Button的代码什么的完全一样。但是btn7 点了就是没反应。音乐不播放，为什么！

困扰我很久。谢谢大家