How to use SetTopRow function

[Hoang Dinh]

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]

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]

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]

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;
	}
}