wpf listview selecteditem 报错是因为搞了个itemssource！

nnd，调了半天，原来绑了个itemssource.

  private void listView1_MouseUp(object sender, MouseButtonEventArgs e) { try { ListViewItem lvi = new ListViewItem(); MessageBox.Show(MainWindow.lv.SelectedItem.ToString());//lv是源。 lvi = (ListViewItem)MainWindow.lv.SelectedItem; MessageBox.Show(lvi.Content.ToString()); WrapPanel wp = (WrapPanel)lvi.Content; MessageBox.Show(wp.Children.Count.ToString()); Label lbpoint = (Label)wp.Children[1]; } catch (Exception ee) {MessageBox.Show(ee.ToString()); } }