I need the Expand / Collapse for RowDetailsTemplate

user_450466 0
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I have a DataGrid. It has DataGrid.RowDetailsTemplate. When a button is clicked it should Expand / Collapse; how would I do that?

<Custom:DataGrid RowDetailsVisibilityMode="VisibleWhenSelected" SelectionMode="Extended" CanUserAddRows="False" CanUserDeleteRows="False" CanUserResizeRows="False" CanUserSortColumns="False">
    <Custom:DataGrid.RowDetailsTemplate>
        <DataTemplate>
            <Custom:DataGrid>
                <Custom:DataGrid.Columns>
                    <Custom:DataGridTextColumn Binding="{Binding idClient, Mode=Default}" Header="Ид" IsReadOnly="True"/>
                    <Custom:DataGridTextColumn Binding="{Binding name_client, Mode=Default}"  Header="Имя" IsReadOnly="True"/>
                </Custom:DataGrid.Columns>
            </Custom:DataGrid>
        </DataTemplate>
    </Custom:DataGrid.RowDetailsTemplate>
    <Custom:DataGrid.Columns>
        <Custom:DataGridTemplateColumn>
            <Custom:DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Expander IsExpanded="True"/>
                </DataTemplate>
            </Custom:DataGridTemplateColumn.CellTemplate>
        </Custom:DataGridTemplateColumn>
        <Custom:DataGridTextColumn Binding="{Binding idPartner, Mode=Default}" Header="Ид" IsReadOnly="True"/>
        <Custom:DataGridTextColumn Binding="{Binding name_partner, Mode=Default}"  Header="Имя" IsReadOnly="True"/>
    </Custom:DataGrid.Columns>
</Custom:DataGrid>
expander button datagrid wpf
5 Answers

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:

 <Expander Expanded="Expander_Process"  Collapsed="Expander_Process" />
user_2857950
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