GridView Export to Excel

 

        /// <summary>
        /// GridView Export to Excel
        /// </summary>
        /// <param name="gv">GridView</param>
        public void GridViewToExcel(System.Web.UI.WebControls.GridView gv)
        {
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.Buffer =  true;
            HttpContext.Current.Response.Charset = "GB2312";
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.DateTime.Today.ToShortDateString() + ".xls");
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            HttpContext.Current.Response.ContentType = "application/ms-excel";
            using (StringWriter sw = new StringWriter())
            {
                using (HtmlTextWriter htw = new HtmlTextWriter(sw))
                {
                    Table table = new Table();
                    table.GridLines = gv.GridLines;
                    if (gv.HeaderRow != null)
                    {
                        PrepareControlForExport(gv.HeaderRow);
                        table.Rows.Add(gv.HeaderRow);
                    }
                    foreach (GridViewRow row in gv.Rows)
                    {
                        PrepareControlForExport(row);
                        table.Rows.Add(row);
                    }
                    if (gv.FooterRow != null)
                    {
                        PrepareControlForExport(gv.FooterRow);
                        table.Rows.Add(gv.FooterRow);
                    }
                    System.IO.StringWriter tw = new System.IO.StringWriter();
                    System.Web.UI.HtmlTextWriter hw = new HtmlTextWriter(tw);

                    table.RenderControl(htw);
                    HttpContext.Current.Response.Write("<meta   http-equiv=Content-Type   content=text/html;charset=GB2312>");
                    HttpContext.Current.Response.Write(sw.ToString());
                    HttpContext.Current.Response.End();
                }
            }
        }
        /// <summary>
        /// Replace any of the contained controls with literals
        /// </summary>
        /// <param name="control">Control</param>
        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())
                {
                    PrepareControlForExport(current);
                }
            }
        }