如何解决WPF中 ScrollViewer 内包含 TreeView 或者 ListBox 等控件时滚轮事件被劫持的问题

<DataGrid ScrollViewer.HorizontalScrollBarVisibility="Disabled" 
ScrollViewer.VerticalScrollBarVisibility="Disabled" />

// scrollViewer的滚动事件
private void scrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta);
    eventArg.RoutedEvent = UIElement.MouseWheelEvent;
    eventArg.Source = e.Source;
    ScrollViewer scv = (ScrollViewer)sender;
    scv.RaiseEvent(eventArg);
    e.Handled = true;
}

// datagrid的滚动事件
private void DataGrid_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    // 直接跳转至上述scrollViewer的滚动事件
    scrollViewer_PreviewMouseWheel(scrollViewer, e);
}