GridView导出Excel格式问题(科学计数法)

问题描述:相信很多朋友在做GridView导出Excel功能时,像身份证号这种字段的数据导出来格式是科学计数法显示而无法正常使用.

解决方法:

1.先定义格式转换方法:

文本：vnd.ms-excel.numberformat:@
日期：vnd.ms-excel.numberformat:yyyy/mm/dd
数字：vnd.ms-excel.numberformat:#,##0.00
货币：vnd.ms-excel.numberformat:￥#,##0.00
百分比：vnd.ms-excel.numberformat: #0.00% 

private static void gv_ItemDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgs e)
        {
            if (e.Row.RowIndex > -1)
            {
                e.Row.Cells[i].Attributes.Add("style", "vnd.ms-excel.numberformat:@");  //i表示列号,格式类型见上

            }
        }

2.导出Excel方法

/// <summary>
        /// 将DataGrid数据导入到Excel
        /// </summary>
        /// <param name="dg"></param>
        /// <param name="strFileName"></param>
        /// <returns></returns>
        public static void ExportExcel(DataTable dt, string strFileName)
        {
            WebCommon.WriteLogToDB("导出Excel", HttpContext.Current.Request.Url.PathAndQuery, strFileName); //写日志
            System.Web.UI.WebControls.GridView gv = new GridView();
            gv.RowDataBound += new System.Web.UI.WebControls.GridViewRowEventHandler(gv_ItemDataBound); //绑定格式转换方法
            gv.DataSource = dt.DefaultView;
            gv.DataBind();

            System.Web.HttpContext obj = System.Web.HttpContext.Current;
            obj.Response.Clear();
            obj.Response.Buffer = true;
            obj.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF8) + ".xls");
            obj.Response.ContentEncoding = System.Text.Encoding.UTF8;
            obj.Response.ContentType = "application/vnd.ms-excel";//设置输出文件类型为excel文件。
            System.IO.StringWriter sw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
            gv.RenderControl(htw);

            obj.Response.Write(sw.ToString());
            obj.Response.End();
        }

这样即可解决相关问题...