I need the Expand / Collapse for RowDetailsTemplate

Question

I have a DataGrid. It has DataGrid.RowDetailsTemplate. When a button is clicked it should Expand / Collapse; how would I do that?

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Answer 1

Instead of walking the tree to find the datagrid row from the expander, use the static method GetRowContainingElement which is found on DataGridRow. Such as:

private void Expander_Process(object sender, RoutedEventArgs e)
{
    if (sender is Expander expander)
    {
        var row = DataGridRow.GetRowContainingElement(expander);

        row.DetailsVisibility = expander.IsExpanded ? Visibility.Visible 
                                                    : Visibility.Collapsed;
    }
}

Then the expander has only one method call for each of the events: