Example 1: TcxDataSummaryItems.OnSummary

• Jul 29, 2021

By default, summary calculations involve all elements. In this example a summary representing the number of non-NULL item elements is evaluated. To modify the default summary calculation, you should write the TcxDataSummaryItems.OnSummary event. The Done flag indicates whether the value should be ignored. See the Creating Summaries topic to learn how to set summaries for a grid control.

Delphi

procedure TForm1.cxGrid1DBTableView1TcxGridDBDataControllerTcxDataSummary
DefaultGroupSummaryItemsSummary(
  ASender: TcxDataSummaryItems; Arguments: TcxSummaryEventArguments;
  var OutArguments: TcxSummaryEventOutArguments);
begin
  if (VarIsNull(OutArguments.Value)) then
    OutArguments.Done := True;
end;

C++

void __fastcall TForm1::cxGrid1DBTableView1TcxGridDBDataControllerTcxDataSummary
DefaultGroupSummaryItemsSummary(
  TcxDataSummaryItems *ASender, TcxSummaryEventArguments &Arguments,
  TcxSummaryEventOutArguments &OutArguments) {
  if (VarIsNull(OutArguments.Value)) {
    OutArguments.Done = true;
  }
}