类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内。

错误的写法:

 if (this.GridView1.Rows.Count > 0)

        {

            string style = @"<style> .text { mso-number-format:\@; } </script> ";

            string exportfile = "supp" + DateTime.Now.ToString("yyyy-MM-dd").Replace("-", "");

            Response.ClearContent();

            Response.AddHeader("content-disposition", "attachment; filename=" + exportfile + ".xls");

 

            Response.ContentType = "application/excel";

            StringWriter sw = new StringWriter();

            HtmlTextWriter htw = new HtmlTextWriter(sw);

 

            GridView1.RenderControl(htw);

            Response.Write(style);

            Response.Write("<META http-equiv=Content-Type content='text/html; charset=utf-8'>" + sw.ToString());

            Response.End();

        }

        else

        {

            ShowMessageBox("无数据导出!");

        }

此时会报出错误提示:

类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内。

解决导出Excel问题  if (this.GridView1.Rows.Count > 0)

        {

            string style = @"<style> .text { mso-number-format:\@; } </script> ";

            string exportfile = HttpUtility.UrlEncode("考核数据分析", System.Text.Encoding.UTF8) + System.DateTime.Now.ToString("yyyy-MM-dd").Replace("-", "") + System.DateTime.Now.ToString("hh-mm-ss").Replace("-", "");

            Response.ClearContent();

            Response.AddHeader("content-disposition", "attachment; filename=" + exportfile + ".xls");

            Response.ContentType = "application/excel";

            Response.Charset = "GB2312";

            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");

            StringWriter sw = new StringWriter();

            HtmlTextWriter htw = new HtmlTextWriter(sw);

            GridView1.Columns[GridView1.Columns.Count - 1].Visible = false;

            GridView1.RenderControl(htw);

            Response.Write(style);

            Response.Write("<META http-equiv=Content-Type content='text/html; charset=gb2312'>" + sw.ToString());

            Response.End();

        }  

public override void VerifyRenderingInServerForm(Control control)
{

}