怎样判断Listbox拉到底部?
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="1,0,1,0" >
<ListBox x:Name="MainListBox" SelectionChanged="MainListBox_SelectionChanged" >
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Margin="2" VerticalAlignment="Top" Source="{Binding Path=ImageUri}" Width="40" Height="40" />
<StackPanel Orientation="Horizontal" Margin="1">
<TextBlock Width="50" FontSize="20" VerticalAlignment="Top" HorizontalAlignment="Left" Text="{Binding Path=Id}" />
<TextBlock Width="100" FontSize="26" VerticalAlignment="Top" HorizontalAlignment="Left" Text="{Binding Path=Name}" />
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>