• Article

DataGrid.ExpandRowGroup Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Expands data grid row groups.

Namespace:  System.Windows.Controls
Assembly:  System.Windows.Controls.Data (in System.Windows.Controls.Data.dll)

Syntax

'Declaration
Public Sub ExpandRowGroup ( _
    collectionViewGroup As CollectionViewGroup, _
    expandAllSubgroups As Boolean _
)

public void ExpandRowGroup(
    CollectionViewGroup collectionViewGroup,
    bool expandAllSubgroups
)

Parameters

  • expandAllSubgroups
    Type: System.Boolean
    true to expand all subgroups of the row group; otherwise, false.

Remarks

You can call this method to programmatically expand row groups in a DataGrid control that contains grouped data. You can use the GetGroupFromItem method to get the particular group that a specified item belongs to. Alternatively, you can iterate through the Groups collection to expand all row groups.

Examples

The following example demonstrates how to expand all row groups in a DataGrid control. This example is part of a larger example available in the How to: Group, Sort, and Filter Data in the DataGrid Control topic.

Private Sub ExpandButton_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
    Dim pcv As PagedCollectionView = Me.dataGrid1.ItemsSource
    Try
        For Each group As CollectionViewGroup In pcv.Groups
            dataGrid1.ExpandRowGroup(group, True)
        Next
    Catch ex As Exception
        ' Could not expand group.
        MessageBox.Show(ex.Message)
    End Try
End Sub

private void ExpandButton_Click(object sender, RoutedEventArgs e)
{
    PagedCollectionView pcv = dataGrid1.ItemsSource as PagedCollectionView;
    try
    {
        foreach (CollectionViewGroup group in pcv.Groups)
        {
            dataGrid1.ExpandRowGroup(group, true);
        }
    }
    catch (Exception ex)
    {
        // Could not expand group.
        MessageBox.Show(ex.Message);
    }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.