CollapseGroupsToLevel Method

Collapses all the group rows to a given level.

Syntax

Visual Basic
C#

'Declaration
 
Public Sub CollapseGroupsToLevel( _
   ByVal level As System.Integer _
)

public void CollapseGroupsToLevel( 
   System.int level
)

Parameters

level: Grouping level to show.

Remarks

When the grid is bound to a grouped data source, it automatically adds group rows above each group. Individual group rows can be collapsed or expanded using the GroupRow.IsCollapsed property.

This method allows the caller to expand or collapse the entire outline to a given level.

For example, if the grid is bound to a data source with three group descriptors, then CollapseGroupsToLevel(0) would collapse all top-level group rows, showing only the first level of the grouping outline. CollapseGroupsToLevel(2) would show all the group rows, and no data rows. CollapseGroupsToLevel(3) would show all rows (groups and detail).

The code below creates data source with three levels of grouping, then shows the first two levels of the grouping outline:

// create grouped data source var view = new PagedCollectionView(dataList); var gd = view.GroupDescriptions; gd.Add(new PropertyGroupDescription("Country")); gd.Add(new PropertyGroupDescription("City")); gd.Add(new PropertyGroupDescription("Customer")); // assign data source to grid _flex.ItemsSource = view; // collapse grouping outline to level 1 // (show country and city groups, hide customer groups and all detail rows) _flex.CollapseGroupsToLevel(1); // expand grouping outline show all detail _flex.CollapseGroupsToLevel(gd.Count); // collapse grouping outline to show all group rows and no detail _flex.CollapseGroupsToLevel(gd.Count - 1);

Example

The code below creates data source with three levels of grouping, then shows the first two levels of the grouping outline:

// create grouped data source
var view = new PagedCollectionView(dataList);
var gd = view.GroupDescriptions;
gd.Add(new PropertyGroupDescription("Country"));
gd.Add(new PropertyGroupDescription("City"));
gd.Add(new PropertyGroupDescription("Customer"));
            
// assign data source to grid
_flex.ItemsSource = view;
            
// collapse grouping outline to level 1
// (show country and city groups, hide customer groups and all detail rows)
_flex.CollapseGroupsToLevel(1);
            
// expand grouping outline show all detail
_flex.CollapseGroupsToLevel(gd.Count);
            
// collapse grouping outline to show all group rows and no detail
_flex.CollapseGroupsToLevel(gd.Count - 1);

Reference

C1FlexGrid Class
C1FlexGrid Members