public MergeGridviewHeader()
{
MergedColumns.Clear();
StartColumns.Clear();
Titles.Clear();
MergedColumnCss.Clear();
}
public static void RenderHeader(HtmlTextWriter output, Control container)
{
for (int i = 0; i < container.Controls.Count; i++)
{
TableCell cell = (TableCell)container.Controls[i];
//stretch non merged columns for two rows
if (!MergedColumns.Contains(i))
{
cell.Attributes["rowspan"] = "2";
cell.RenderControl(output);
}
else //render merged columns common title
if (StartColumns.Contains(i))
{
if (MergedColumnCss.ContainsKey(i))
{
output.Write(string.Format("<th align='center' colspan='{0}' class='{2}' >{1}</th>",
StartColumns[i], Titles[i], MergedColumnCss[i]));
}
else
{
output.Write(string.Format("<th align='center' colspan='{0}' >{1}</th>",
StartColumns[i], Titles[i]));
}
}
}
//close the first row
output.RenderEndTag();
//set attributes for the second row
//grid.HeaderStyle.AddAttributesToRender(output);
//start the second row
output.RenderBeginTag("tr");
//render the second row (only the merged columns)
int currentCssID = 0;
for (int i = 0; i < MergedColumns.Count; i++)
{
TableCell cell = (TableCell)container.Controls[MergedColumns[i]];
if (MergedColumnCss.ContainsKey(MergedColumns[i]))
{
currentCssID = MergedColumns[i];
}
if (MergedColumnCss.ContainsKey(currentCssID))
{
cell.CssClass = MergedColumnCss[currentCssID];
}
cell.RenderControl(output);
}
MergedColumns.Clear();
StartColumns.Clear();
Titles.Clear();
MergedColumnCss.Clear();
}