我在弹出窗口中使用了列表框。当我第二次导航到弹出窗口时,列表框项目未清除。如何清除列表框项目。请帮助我完成此查询。这是我用过的代码
<ListBox Background="LightYellow" ItemsSource="{Binding Mode=OneWay, Path= MyPrintingSheetItems}" Grid.ColumnSpan="2" Grid.Row="6" Height="270" HorizontalAlignment="Stretch" Margin="0,0,0,0" Name="ListBox2" VerticalAlignment="Top" Width="440" >
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<Border BorderThickness="0,0,0,3" BorderBrush="pink" >
<Grid >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="170"/>
<ColumnDefinition Width="90"/>
<ColumnDefinition Width="90"/>
<ColumnDefinition Width="90"/>
</Grid.ColumnDefinitions>
<TextBlock Name="lblps" Height="50" Text="{Binding PrintingSheet}" FontSize="26" Grid.Column="0" VerticalAlignment="Center" Margin="0,0, 0, 0" HorizontalAlignment="Center" Foreground="Black" />
<TextBlock Height="50" Name="lblnrml" Text="{Binding Normal}" FontSize="26" Grid.Column="1" Margin="0,0, 0, 0" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="Black" />
<TextBlock Height="50" Name="lblhvy" Text="{Binding Heavy}" FontSize="26" Grid.Column="2" Margin="0,0, 0, 0" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="Black" />
<TextBlock Height="50" Name="lblmetal" Text="{Binding Metal}" FontSize="26" Grid.Column="3" Margin="0,0, 0, 0" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="Black" />
</Grid>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
按钮点击事件代码:
Private Sub btnAdd_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
PopUp.IsOpen = True
btnAdd.IsEnabled = False
btnBack.IsEnabled = False
btnDelete.Visibility = Windows.Visibility.Collapsed
txtLength.Text = ""
txtwidth.Text = ""
txtsize.Text = ""
CheckBox1.IsChecked = False
ListBox1.IsEnabled = False
TitleLayOut.Opacity = 0.5
LayoutRoot.Background = BrushFromColorName("#AA000000")
txtSearch.IsEnabled = False
btnSearch.IsEnabled = False
ListBox1.Opacity = 0.5
End Sub