WPF DataGrid SelectedItems - keeping multiple selected while left clicking.

Question

is there a way to mimic the behavior of ctrl+click which keeps previously selected rows selected and just adds more selected items?

by default, when clicking on each row, all previously selected rows get de-selected.

one way to achieve this, would be to override SelectionChanged event, and re-select removed rows.

void TestGrid_SelectionChanged(object sender, SelectionChangedEventArgs e) {
    foreach (var i in e.RemovedItems)
        TestGrid.SelectedItems.Add(i);

}

This is not ideal however, because in some situations i would want to de-select rows (such as when clicking a toggle button in one of the columns).

Answer 1

Set the SelectionMode to DataGridSelectionMode.Extended

Answer 2

here's a solution that worked for me.

i removed all properties that set details visiblity (to keep everything at default)

than added the following style

<Style x:Key="VisibilityStyle" TargetType="{x:Type DataGridRow}">
    <Style.Triggers>
        <DataTrigger Binding="{Binding Path=Visible}" Value="False">
            <Setter Property="DetailsVisibility" Value="Collapsed" />
        </DataTrigger>
        <DataTrigger Binding="{Binding Path=Visible}" Value="True">
            <Setter Property="DetailsVisibility" Value="Visible" />
        </DataTrigger>
    </Style.Triggers>
</Style>

assigned this resource to RowStyle

in my underlying data object, i added Visible property, and Implemented INotifyPropertyChanged interface.

now whenever i want to show/hide details, i simply manipulate the Visible property on my underlying object. this can happen from column button handler, to anywhere else in my code. works great