GridView導出Excel格式問題(科學計數法)

相信不少朋友在作GridView導出Excel功能時,像×××號這種字段的數據導出來格式是科學計數法顯示而沒法正常使用.

解決方法:

1.先定義格式轉換方法:

文本：vnd.ms-excel.numberformat:@
日期：vnd.ms-excel.numberformat:yyyy/mm/dd
數字：vnd.ms-excel.numberformat:#,##0.00
貨幣：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表示列號,格式類型見上

            }
        }

2.導出Excel方法

/// <summary>
        /// 將DataGrid數據導入到Excel
        /// </summary>
        /// <param name="dg"></param>
        /// <param name="strFileName"></param>
        /// <returns></returns>
        public static void ExportExcel(DataTable dt, string strFileName)
        {
            WebCommon.WriteLogToDB("導出Excel", HttpContext.Current.Request.Url.PathAndQuery, strFileName); //寫日誌
            System.Web.UI.WebControls.GridView gv = new GridView();
            gv.RowDataBound += new System.Web.UI.WebControls.GridViewRowEventHandler(gv_ItemDataBound); //綁定格式轉換方法
            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", "p_w_upload;filename=" + HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF8) + ".xls");
            obj.Response.ContentEncoding = System.Text.Encoding.UTF8;
            obj.Response.ContentType = "application/vnd.ms-excel";//設置輸出文件類型爲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();
        }