asp.net 将GridView导出到Excel

   /// <summary>
    /// GridView导出Excel
    /// </summary>
    /// <param name="pageLocal">要导出的页面</param>
    /// <param name="gvVal">要导出的GridView</param>
    /// <param name="sFileName">导出后的文件名</param>
    public static void ExcelExport(Page pageLocal, GridView gvVal, string sFileName)
    {
        string attachment = "attachment; filename=" + sFileName + ".xls";
        pageLocal.Response.ClearContent();
        pageLocal.Response.AddHeader("content-disposition", attachment);
        pageLocal.Response.ContentType = "application/ms-excel";
        StringWriter sw = new StringWriter();
        HtmlTextWriter htw = new HtmlTextWriter(sw);

        // Create a form to contain the grid
        HtmlForm frm = new HtmlForm();
        gvVal.Parent.Controls.Add(frm);
        frm.Attributes["runat"] = "server";
        frm.Controls.Add(gvVal);
        frm.RenderControl(htw);

        //GridView1.RenderControl(htw);
        pageLocal.Response.Write(sw.ToString());
        pageLocal.Response.End();
    }