c# 导出复杂excel ,合并单元格

今天做了一个关于订单得导出得，一个订单一般都是多个商品，那么就会出现单元格合并得情况，还有复杂表头得情况，现在拿我做得，给大家一个小demo

先看最终效果

后台实现：

代码：

 [HttpGet]
        [ValidateInput(false)]
        public ActionResult Order_Export()
        {
            int showType;
            int ws_userid;
            int.TryParse(Request["ws_userid"], out ws_userid);
            int.TryParse(Request["showType"], out showType);

            string keywords = Request["keywords"];

            string starttime = Request["starttime"];
            string endtime = Request["endtime"];
            ws_orderManager ws_OrderManager = new ws_orderManager();
            string fileName = "订单导出";
            int count = 0;
            var data = ws_OrderManager.GetOrderExportList(showType, ws_userid, keywords, 1, 1000, starttime, endtime, ref count);

            switch (showType)
            {
                case 1:
                    fileName += "-待付款";
                    break;
                case 2:
                    fileName += "-待发货";
                   
                    break;
                case 3:
                    fileName += "-待收货";
                    
                    break;
                case 4:
                    fileName += "-交易成功";
                    
                    break;
                case -1:
                    fileName += "-交易关闭";
                    
                    break;
                default:
                    fileName += "-全部订单";
                    
                    break;
            }
            if (!string.IsNullOrWhiteSpace(starttime) && !string.IsNullOrWhiteSpace(endtime))
            {
                fileName += "-" + starttime + "——" + endtime;
            }
            return ExportFundDataToExcel(data, fileName);
        }

 
public ActionResult ExportFundDataToExcel(List<OrderViewModel> listData, string filename)
        {
            var fileHtml = getFundDataCollect(listData, filename);
            if (fileHtml == "")
            {
                return Json(JsonHelper.LayuiRsulit("当前没有数据需要导出", false));
            }
            byte[] fileContents = Encoding.UTF8.GetBytes(fileHtml);
           
            return File(fileContents, "application/ms-excel; charset=UTF8", filename + ".xls");
        }
        public string AddExcelbottom()
        {

            StringBuilder sb = new StringBuilder();

            sb.Append("</body>");

            sb.Append("</html>");

            return sb.ToString();

        }
        public string AddExcelHead()
        {

            StringBuilder sb = new StringBuilder();

            sb.Append("<html xmlns:x=\"urn:schemas-microsoft-com:office:excel\">");

            sb.Append(" <head>");

            sb.Append(" <!--[if gte mso 9]><xml>");

            sb.Append("<x:ExcelWorkbook>");

            sb.Append("<x:ExcelWorksheets>");

            sb.Append("<x:ExcelWorksheet>");

            sb.Append("<x:Name></x:Name>");

            sb.Append("<x:WorksheetOptions>");

            sb.Append("<x:Print>");

            sb.Append("<x:ValidPrinterInfo />");

            sb.Append(" </x:Print>");

            sb.Append("</x:WorksheetOptions>");

            sb.Append("</x:ExcelWorksheet>");

            sb.Append("</x:ExcelWorksheets>");

            sb.Append("</x:ExcelWorkbook>");

            sb.Append("</xml>");

            sb.Append("<![endif]-->");

            sb.Append(" </head>");

            sb.Append("<body>");

            return sb.ToString();



        }
        public string getFundDataCollect(List<OrderViewModel> dt, string taskname)
        {

            if (null == dt)
            {
                return "";
            }
            if (dt.Count < 1)
            {
                return "";
            }
            var fileHtml = new StringBuilder();
            fileHtml.Append(AddExcelHead());
            fileHtml.Append("<table border=\"1\" style=\"table-layout:fixed;\" cellspacing='0' cellpadding='0'>");
            fileHtml.Append("<tr>");
            fileHtml.Append("<td colspan=\"9\" style=\"font-size: 16px; font-family: 宋体; text-align: center; height: 30px;\">");
            fileHtml.AppendFormat(" <strong> {0}</strong>", taskname);
            fileHtml.Append("</td>");
            fileHtml.Append(" </tr>");

            fileHtml.Append("<tr>");
            
            fileHtml.Append("<td>订单号</td>" );

            fileHtml.Append("<td>下单时间</td>");
            fileHtml.Append("<td>商品名称</td>");
            fileHtml.Append("<td>商品数量</td>");
            fileHtml.Append("<td>商品SKU</td>");
            fileHtml.Append("<td>总金额</td>");
            fileHtml.Append("<td>收货人</td>");
            fileHtml.Append("<td>收货电话</td>");
            fileHtml.Append("<td>收货地址</td>");
            fileHtml.Append(" </tr>");
          
            for (var j = 0; j < dt.Count; j++)
            {
                fileHtml.Append("<tr>");

                fileHtml.AppendFormat("<td rowspan=\"{0}\" style=\"text-align: center;\">'{1}</td>",dt[j].goodsList.Count, dt[j].order_sn);
                fileHtml.AppendFormat("<td rowspan=\"{0}\" style=\"text-align: center;\">'{1}</td>", dt[j].goodsList.Count, dt[j].add_time);
                StringBuilder nextStr = new StringBuilder();
               
                if(dt[j].goodsList.Count == 1)
                {
                    
                    fileHtml.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[0].goods_name);
                    fileHtml.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[0].number);
                    fileHtml.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[0].goods_specifition_name_value);
                }
                else
                {
                   
                    fileHtml.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[0].goods_name);
                    fileHtml.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[0].number);
                    fileHtml.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[0].goods_specifition_name_value);
                   
                    for (int i = 1; i < dt[j].goodsList.Count; i++)
                    {
                        nextStr.Append("<tr>");
                        nextStr.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[i].goods_name);
                        nextStr.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[i].number);
                        nextStr.AppendFormat("<td  style=\"text-align: center;\">{0}</td>", dt[j].goodsList[i].goods_specifition_name_value);
                        nextStr.Append("</tr>");
                    }
                   
                }
               
                fileHtml.AppendFormat("<td rowspan=\"{0}\" style=\"text-align: center;\">{1}</td>", dt[j].goodsList.Count, dt[j].actual_price);
                fileHtml.AppendFormat("<td rowspan=\"{0}\" style=\"text-align: center;\">{1}</td>", dt[j].goodsList.Count, dt[j].name);
                fileHtml.AppendFormat("<td rowspan=\"{0}\" style=\"text-align: center;\">{1}</td>", dt[j].goodsList.Count, dt[j].mobile);
                fileHtml.AppendFormat("<td rowspan=\"{0}\" style=\"text-align: center;\">{1}</td>", dt[j].goodsList.Count, dt[j].ProvinceName + dt[j].CityName + dt[j].DistrictName + dt[j].address);
                fileHtml.Append("</tr>");
                fileHtml.Append(nextStr.ToString());

            }
           
            fileHtml.Append("</table>");
            fileHtml.Append(AddExcelbottom());
            return fileHtml.ToString();
        }

我得数据结构是这样得：

最外层是订单信息，里面有一个数组，goodsList，这个是订单中得商品

前台请求，这样访问：

window.location='/@ViewContext.RouteData.DataTokens["area"]/@ViewContext.RouteData.Values["controller"].ToString()/Order_Export?page=1&limit=9999999&showType=' + showType+'&keywords='+$("#keywords").val() + '&starttime='+$("#starttime").val()+'&endtime=' + $("#endtime").val();

这样就会自动进行下载了，欢迎各位评论！