protected void btnExport_Click(object sender, EventArgs e)
{
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=Report.xls");
Response.ContentType = "application/ms-excel";
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
// Create a table to contain the grid
Table table = new Table();
// include the gridline settings
table.GridLines = reportGrid.GridLines;
// add the header row to the table
if (reportGrid.HeaderRow != null)
{
AttendanceReport.PrepareControlForExport(reportGrid.HeaderRow);
table.Rows.Add(reportGrid.HeaderRow);
}
// add each of the data rows to the table
foreach (GridViewRow row in reportGrid.Rows)
{
AttendanceReport.PrepareControlForExport(row);
table.Rows.Add(row);
}
// add the footer row to the table
if (reportGrid.FooterRow != null)
{
AttendanceReport.PrepareControlForExport(reportGrid.FooterRow);
table.Rows.Add(reportGrid.FooterRow);
}
// render the table into the htmlwriter
table.RenderControl(htw);
// render the htmlwriter into the response
HttpContext.Current.Response.Write(sw.ToString());
HttpContext.Current.Response.End();
}
}
}
private static void PrepareControlForExport(Control control)
{
for (int i = 0; i < control.Controls.Count; i++)
{
Control current = control.Controls[i];
if (current is LinkButton)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));
}
else if (current is ImageButton)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));
}
else if (current is HyperLink)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));
}
else if (current is DropDownList)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));
}
else if (current is CheckBox)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));
}
if (current.HasControls())
{
AttendanceReport.PrepareControlForExport(current);
}
}
}