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<ListBox x:Name="PlayListBox" ItemsSource="{Binding VedioScreenList,Mode=TwoWay}"
SelectedItem="{Binding VedioScreenItem}" SelectionMode="Single"
ItemContainerStyle="{StaticResource ListBoxItemStyle}"
SelectionChanged="PlayListBox_SelectionChanged" />
void PlayListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
VedioScreen vs = PlayWndListBox.SelectedItem as VedioScreen;
var lstitem = (sender as ListBox).SelectedItem as ListBoxItem; //这里lstitem是null
}