WPF DataGrid鼠标滚不动,划不动解决

WPF DataGrid鼠标悬浮时，滚不动,划不动解决
给DataGrid添加事件 PreviewMouseWheel=“UIElement_OnPreviewMouseWheel”

<DataGrid x:Name="DataGridList56"Grid.Column="0"Margin="0,5,0,0"AutoGenerateColumns="False"CanUserAddRows="False"CanUserDeleteRows="False"ItemsSource="{Binding SymptomQuestionnaires}"PreviewMouseWheel="UIElement_OnPreviewMouseWheel"SelectedItem="{Binding CurrentSelectedRowData}"SelectionUnit="FullRow">

后台代码

privatevoidUIElement_OnPreviewMouseWheel(objectsender,MouseWheelEventArgse){if(sender!=null&&senderisDataGriddataGrid){vareventArg=newMouseWheelEventArgs(e.MouseDevice,e.Timestamp,e.Delta);eventArg.RoutedEvent=MouseWheelEvent;eventArg.Source=sender;dataGrid.RaiseEvent(eventArg);}}