我有一个数据列表, 每行都会显示一个数据,并且会有一个按钮,当我点击显示的数据时,我想给一些数据到前一页,当我点击同一行中的按钮时,我想要将相同的数据发送到下一页。如何从Windows Phone的列表框中选择一个项目?
我的XAML代码,
<ListBox x:Name="List" HorizontalAlignment="Left" Height="612" Margin="6,7,0,0" VerticalAlignment="Top" Width="443" SelectionChanged="List_SelectionChanged_1">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Width="420" Height="50">
<TextBlock x:Name="tbName" Width="400" Height="44" FontSize="22" FontWeight="Bold" Text="{Binding Name}" />
<Button x:Name="DetailButton" Height="44" Width="20" Content=">" FontWeight="Bold" Click="DetailButton_Click_1"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
和List_SelectionChanged_1事件处理程序的代码,
private void List_SelectionChanged_1(object sender, SelectionChangedEventArgs e)
{
Display selectedItemData = (sender as ListBox).SelectedValue as Display;
NavigationService.Navigate("/Page1.xaml",selectedItemData);
}
和我DetailButton_Click_1事件处理程序,
private void DetailButton_Click_1(object sender, RoutedEventArgs e)
{
Display selectedItemData = (sender as ListBox).SelectedValue as Display;
NavigationService.Navigate("/page3.xaml", selectedItemData);
}
件事情做工精细的* List_SelectionChanged_1 *,但我得到一个异常在执行DetailButton_Click_1的
Display selectedItemData = (sender as ListBox).SelectedValue as Display;
,我得到一个异常的空异常,
An exception of type 'System.NullReferenceException' occurred in ExpenseApp.DLL but was not handled in user code
我应该怎么做使它工作?