使用RenderControl步骤把GridView控件导出到EXCEL

使用RenderControl方法把GridView控件导出到EXCEL

 //  把GridView输出到Excel文件
        private void ExportExcel(GridView gridView, string title, string title2, string fileName)
        {
            int nHideCols = 0;
            //如果不想输出出某列，将Visible设为false即可
            for (int i = 0; i < gridView.Columns.Count; i++)
            {
                if (gridView.Columns[i].HeaderText == "设备状态")
                {
                    gridView.Columns[i].Visible = false;
                    gridView.Columns[i].ControlStyle.Width = 0;
                    nHideCols = 1;
                    break;
                }
            }
            //设定显示字符集
            Response.Charset = "utf-8";
            //设定内容字符集
            Response.ContentEncoding = Encoding.GetEncoding("utf-8"); 

           Asp.net中Response.Charset 与Response.ContentEncoding区别 

            //设定文件名
            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8).Replace('+', '_').Replace('-', '_'));
            //设定文件类型   也可以是application/ms-word,也可以是text/html（字符集设为gb2312）
            Response.ContentType = "application/ms-excel";
            this.EnableViewState = false;
            using (StringWriter tw = new StringWriter())
            {

                using (HtmlTextWriter hell = new HtmlTextWriter(tw))
                {
                    gridView.AllowPaging = false;
                    gridView.RenderControl(hell);

                    string s = tw.ToString();
                    s = s.Replace("\r\n", "");
                    int index = s.IndexOf("<tr");
                    //可以自定义Excel文件的标题
                    string head = "<tr><td colspan=\"" + (gridView.Columns.Count - nHideCols).ToString() + "\" style=\"text-align: center; height: 42px; font-size: 24px; font-weight: bolder; color: #000000;\">" + title + "</td></tr>" +
                            "<tr><td colspan=\"" + (gridView.Columns.Count - nHideCols).ToString() + "\" style=\"text-align: center; height: 24px; font-size: 12px; color: #000000;\">" + title2 + "</td></tr>";
                    //使用Index来判断是否存在数据，当然也可以用gridView.Rows.Count来判断
                    if (index != -1)
                    {
                        //有数据的
                        s = s.Insert(index, head);
                    }
                    else
                    {
                        //没有数据的时候
                        s = "<table cellspacing=\"0\" cellpadding=\"3\" rules=\"rows\" border=\"1\" id=\"" + gridView.ID + "\" style=\"background-color:White;border-color:#E7E7FF;border-width:1px;border-style:None;border-collapse:collapse;\">" +
                            head + "</table>";
                    }
                    Response.Write(s);
                    Response.End();
                }
            }
        }

        //同时vs2005,vs2003会报错“类型“ExGridView”的控件“GridViewMaster”必须放在具有 runat=server 的窗体标记内
        //需要添加下面取消对GridViewMaster 控件验证的方法
        public override void VerifyRenderingInServerForm(Control control)
        {
            if (!control.GetType().Equals(gridView.GetType()))
            {
                base.VerifyRenderingInServerForm(control);
            }
        }