WPF中ListBox相应鼠标滚动上下翻

1、方法：
private void list_MouseWheel(object sender, MouseWheelEventArgs e)
{
if(e.Delta>0)
localLogView.ScrollToVerticalOffset(localLogView.VerticalOffset-20);
else
localLogView.ScrollToVerticalOffset(localLogView.VerticalOffset+20);
}
2、调用：
localLogView.AddHandler(ListBox.MouseWheelEvent,new MouseWheelEventHandler(list_MouseWheel), true);
3、其中localLogView是ScrollViewer的名字，ListBox包含在该控件中