How to optimize the ResizeToFit method for large number of records in WinForms GridGroupingControl?
Optimize the ResizeToFit method
The mechanism of ResizetoFit() method is that it checks each value of the cells and its width and then calculates the width of the column. So, when you check for rows above 44k, it takes more time than expected. The solution for this problem is, you can apply the ResizetoFit() method only for the visible layout. That is, instead of applying the ResizetoFit() method to the whole WinForms GridGrouping Control, you can apply this method to the viewable cells. You can get the viewable cells row and column index by using the TableControlVScrollPixelPosChanged event.
Refer to the following code examples for the TableControlVScrollPixelPosChanged event.
C#
//Event triggering.
this.gridGroupingControl1.TableControlVScrollPixelPosChanged += new GridTableControlScrollPositionChangedEventHandler(gridGroupingControl1_TableControlVScrollPixelPosChanged);
void gridGroupingControl1_TableControlVScrollPixelPosChanged(object sender, GridTableControlScrollPositionChangedEventArgs e)
{
int top_rowIndex = this.gridGroupingControl1.TableControl.TopRowIndex;
// Denotes the top visible row index of the grid.
int bottom_rowindex = this.gridGroupingControl1.TableControl.TopRowIndex +
this.gridGroupingControl1.TableControl.ViewLayout.VisibleRows;
// ViewLayout.VisibleRows gives you the number of visible rows in the ViewLayout.
this.gridGroupingControl1.TableModel.ColWidths.ResizeToFit(GridRangeInfo.Cells(top_rowIndex, 0, bottom_rowindex, this.gridGroupingControl1.TableModel.ColCount), GridResizeToFitOptions.IncludeHeaders | GridResizeToFitOptions.IncludeCellsWithinCoveredRange);
}
VB
'hooks GridDataBoundGrid mouse down event. Private Me.gridDataBoundGrid1.MouseDown += AddressOf gridDataBoundGrid1_MouseDown Private Sub gridDataBoundGrid1_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) If Me.gridDataBoundGrid1.Model.Selections.Count > 0 Then Me.gridDataBoundGrid1.Model.CutPaste.Copy() str = Clipboard.GetText() DoDragDrop(str, DragDropEffects.Move) ' selected range are copied, press left && right click to paste in gridcontrol End If End Sub
Another suggestion is that you can use the QueryColWidth event instead of using ResizeToFit() method. Refer to the following code example. In this event, you can change the size of each column with the help of index value.
C#
//Event trigerring.
this.gridGroupingControl1.TableModel.QueryColWidth += new GridRowColSizeEventHandler(TableModel_QueryColWidth);
void TableModel_QueryColWidth(object sender, GridRowColSizeEventArgs e)
{
if (e.Index > 0)
// Add the condition which satisfy your needs.
e.Size = 150;
}
VB
'Event trigerring. Private Me.gridGroupingControl1.TableModel.QueryColWidth += New GridRowColSizeEventHandler(AddressOf TableModel_QueryColWidth) Private Sub TableModel_QueryColWidth(ByVal sender As Object, ByVal e As GridRowColSizeEventArgs) If e.Index > 0 Then ' Add the condition which satisfy your needs. e.Size = 150 End If End Sub
Samples:
C#: ResizeToFit_CS
VB: ResizeToFit_VB
Conclusion
I hope you enjoyed learning about how to optimize the ResizeToFit method for large number of records in WinForms GridGroupingControl.
You can refer to our WinForms GridGroupingControl’s feature tour page to know about its other groundbreaking feature representations. You can also explore our WinForms GridGroupingControl documentation to understand how to present and manipulate data.
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