'Declaration
 
Public Overloads Sub Subtotal( _
   ByVal aggType As AggregateEnum, _
   ByVal level As Integer, _
   ByVal groupFrom As Integer, _
   ByVal groupTo As Integer, _
   ByVal totalOn As Integer, _
   ByVal caption As String, _
   ByVal options As AggregateFlags _
) 

public void Subtotal( 
   AggregateEnum aggType,
   int level,
   int groupFrom,
   int groupTo,
   int totalOn,
   string caption,
   AggregateFlags options
)

Parameters

aggType

AggregateEnum value that specifies the type of aggregate to calculate.

level

Outline level to assign to the new subtotal rows. This parameter allows the creation of multi-level subtotals and affects the display of the outline tree.

groupFrom

First column in the range used to detect group breaks.

groupTo

Last column in the range used to detect group breaks.

totalOn

Column that contains values to be aggregated (usually numeric).

caption

Text to insert in the subtotal rows.

options

Options to use when calculating the aggregates.

The Subtotal(AggregateEnum,Int32,Int32,Int32,Int32,String,AggregateFlags) method inserts rows containing aggregate values. These new rows are set to behave as tree nodes so they can be collapsed and expanded to display a dynamic hierarchical outline.

You can control the appearance and behavior of the outline tree using the Tree property.

The node rows added by the Subtotal(AggregateEnum,Int32,Int32,Int32,Int32,String,AggregateFlags) method have their RowCol.Style property automatically set to one of the Styles.Subtotal* styles. You can use the Styles collection to modify the appearance of all subtotal rows on the grid.

To create an outline tree manually, insert node rows using the RowCollection.InsertNode method, or convert regular rows into nodes by setting the Row.IsNode property to true for the node rows. Then use the Node.Level property to set the outline level for the new nodes.

The code below assumes a grid with four columns: "Product", "Region", "Employee", and "Sales".

The code groups on the first two columns, calculating total sales for each product and for each region within each product.

If the user drags a column to a new position, the tree is automatically rebuilt to show the new grouping (by Employee, Region, etc).

void UpdateTotals()
{
  // no repainting until we're done
  _flex.Redraw = false;
  
  // clear old subtotals, if any
  _flex.Subtotal(AggregateEnum.Clear);
  
  // sort the grid on the columns that will be grouped
  _flex.Sort(SortFlags.Ascending, 0, 3);
  
  // show outline tree on column 0
  _flex.Tree.Column = 0;
  
  // get a grand total (use -1 instead of column index)
  _flex.Subtotal(AggregateEnum.Sum, -1, -1, 3, "Grand Total");
  
  // total on column 0 (initially Product)
  _flex.Subtotal(AggregateEnum.Sum, 0, 0, 3);
  
  // total on column 1 (initially Region)
  _flex.Subtotal(AggregateEnum.Sum, 1, 1, 3);
  
  // show outline level 1
  _flex.Tree.Show(1);
  
  // restore painting
  _flex.Redraw = true;
}
void _flex_AfterDragColumn(object sender, C1.Win.C1FlexGrid.DragRowColEventArgs e)
{
  UpdateTotals(); // user moved a column, update totals
}

Reference

C1FlexGridBase Class
C1FlexGridBase Members
Overload List