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How to use SetTopRow function

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28820 May 11,2005 07:12 AM May 13,2005 09:05 AM Windows Forms 3
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Tags: GridControl
Hoang Dinh
Asked On May 11, 2005 07:12 AM

Hi, I have an issue, Please let me know how to resolve it. I must paging my DataGrid into many pages, I using TopRowChanging event to jump to the next page. I using SetTopRow to changes the top row index and scrolls the grid. But I seem it doesn''t jump to the row I need. Below is my code //GridDataBoundGrid dgrQueryResults private void dgrQueryResults_TopRowChanging(object sender, GridRowColIndexChangingEventArgs e) { if(bAllowRaiseEvent) { //e.Cancel=true; int pos = e.Value; MessageBox.Show("Value "+pos); CurrentPostScroll = pos; //Get next row to jump. CurrentPostScroll = GetNearlyPosition(pos); this.dgrQueryResults.TopRowIndex=CurrentPostScroll-1; this.dgrQueryResults.SetTopRow(CurrentPostScroll-1); this.dgrQueryResults.InternalSetTopRow(CurrentPostScroll-1); this.dgrQueryResults.VScrollBar.Value=CurrentPostScroll-1; this.dgrQueryResults.VScrollBar.Maximum = Math.Max(CurrentPostScroll-1, this.dgrQueryResults.VScrollBar.Maximum); this.dgrQueryResults.UpdateScrollBars(); this.dgrQueryResults.Invalidate(); //CurrentCell.MoveTo(pos-1,0); } } Please help me, Thanks,

Administrator [Syncfusion]
Replied On May 11, 2005 06:42 PM

I do not understand what you are trying to do. If you want to scroll the grid so rowindex 342 is at the top of the grid, then set grid.TopRowIndex = 342. The real question how does your user indicate he wants to page the grid? Does he click a button or something? If so, then in your button handler, increment or decrement grid.TopRowIndex by the ''number of rows in your page''. I do not think you what to try to call SetTopRow in the middle of TopRowChanging.

Hoang Dinh
Replied On May 13, 2005 02:57 AM

Thank you, But When I set TopRowIndex value in TopRowChanged event, this event is raised again. When I drag or click on the arrow on the scrollbar, I need jump to the next page, so that I must call SetTopRow function to jump to the new page. The grid raise TopRowChanged event at least two times. How to prevent the TopRowChanged event when I call SetTopRow function. Thanks,

Administrator [Syncfusion]
Replied On May 13, 2005 09:05 AM

You can avoid executing the code more than once by setting a flag.
private bool inEvent = false;
private void gridDataBoundGrid1_TopRowChanging(object sender, GridRowColIndexChangingEventArgs e)
{
	if(!inEvent)
	{
		inEvent = true;
		this.gridDataBoundGrid1.TopRowIndex = ???;
		inEvent = false;
	}
}
 

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