如何禁止Wpf DataGrid单击事件创建新行

private void DataGrid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    var dataGrid = (DataGrid)sender;
    var rowContainer = VisualTreeHelper.GetParent(e.OriginalSource as UIElement);

    // 检查是否点击的是最后一行
    if (rowContainer is DataGridRow row && row.Item == CollectionView.NewItemPlaceholder)
    {
        e.Handled = true; // 取消事件的进一步处理
    }
}

<DataGrid CanUserAddRows="False" />

<DataGrid>
    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridRow_PreviewMouseLeftButtonDown" />
        </Style>
    </DataGrid.RowStyle>
</DataGrid>

private void DataGridRow_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    var row = (DataGridRow)sender;

    // 检查是否点击的是最后一行
    if (row.Item == CollectionView.NewItemPlaceholder)
    {
        e.Handled = true; // 取消事件的进一步处理
    }
}