DataGrid does not scroll via mouse wheel

[rkeithhill-keysight]

I have created a DataGrid with these properties::

<controls:DataGrid Grid.Row="1"
                   Margin="0,12,0,0"
                   ItemsSource="{x:Bind ViewModel.Items}"
                   IsReadOnly="True"
                   HorizontalAlignment="Stretch"
                   VerticalAlignment="Stretch"
                   HorizontalScrollBarVisibility="Visible"
                   VerticalScrollBarVisibility="Visible"
                   AlternatingRowBackground="Transparent"
                   AlternatingRowForeground="Gray"             
                   AutoGenerateColumns="False"
                   GridLinesVisibility="Horizontal">
    <controls:DataGrid.Columns>
        <controls:DataGridTextColumn Header="Foo" Binding="{Binding Foo}" Width="150" />
        <controls:DataGridTextColumn Header="Version" Binding="{Binding Version}" />
    </controls:DataGrid.Columns>
</controls:DataGrid>

There are more items than that DataGrid can show so the vertical scrollbar appears showing there's about another page of items in the DataGrid. Yet, if I hover over the DataGrid and use my mouse wheel, it does NOT scroll the DataGrid. Mouse wheel scrolling works for the DataGrid in the Windows Community Toolkit Sample App. I'm looking through the source for that sample but I don't see anything obvious that enables mouse wheel support.

[ibseanb]

Is the data grid in a "Auto" height row? It is listed as Row="1". If the outer Grid's row 1 Height="Auto", the grid will be presented off screen, so there is nothing to scroll. Set your Row 1 as * to see if it works.

<Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefininitions>

[rkeithhill-keysight]

The RowDefinition Height was not set at all. I set it explicitly to * but I see no difference in behavior. The mouse wheel still does not scroll the DataGrid contents. I can tell that the data grid is scrollable because I can grab the vertical scrollbar with the mouse and scroll the contents by dragging the mouse. BTW this is an Uno app but atm I'm just trying this on Windows.

[rkeithhill-keysight]

Hmm, I just noticed that if I put the mouse cursor over the first two (from left) DataGrid headers, mouse-wheel scrolling works. However, if the cursor is over the DataGrid data cells or the other headers, the mouse wheel does not scroll. That's a bit weird.

[ibseanb1]

Have you tried setting the Height of the outer grid or the DataGrid itself as a way to determine if it is the DataGrid or something else with your layout? Seems odd that it works with a manual grab of the scroll bar. Does the DataGrid header stay in place when you scroll, or does it move off screen?