Including ''arrows'' in header of manually sorted list

[Damien Sawyer]

Hi,

I am binding the databound grid control to an arraylist of my custom objects, manually adding GridBoundColumns for the columns that I wish to display.

The grid didn''t automatically provide sorting (I''m guessing because I didn''t implement iComparable??). I''ve manually wired it up so that when they click on a column heading, a customised comparer object bound to the arraylist reorders the data. I then rebind the AL to the grid and ''voila''. This works fine.

The problem is that I can''t get the little arrows showing up and down in the currently sorted by column headings. Can you please show me how to set these manually?

Thanks in advance,

Damien

[Administrator]

In order for the GridDataBoundGrid to handle sorting, the datasource must implement IBindingList and supporting through its sorting implementation methods. ArrayList does not implement IBindingList.

To get the sort headers I think the simplest thing to do is to add a member to your class, sortedCol, that you set when you sort a column. Then handled the PrepareViewStyleInfo event, and if the cell is your sort header cell, set its properties there.

//add the member
private int sortedCol

//then after you complete your sort, insert code to set the 
//member and redraw the header row so PrepareViewStyleInfo will be hit
this.sortedCol = e.ColIndex;
this.gridDataBoundGrid1.RefreshRange(GridRangeInfo.Row(0));

//the event handler
private void gridDataBoundGrid1_PrepareViewStyleInfo(object sender, GridPrepareViewStyleInfoEventArgs e)
{
	if(e.RowIndex == 0 && e.ColIndex == sortedCol)
	{
		e.Style.CellType = "ColumnHeaderCell";
		e.Style.Tag = ListSortDirection.Descending;
	}
}

[Damien Sawyer]

Thanks Clay,

Perfect.