C#_.NetFramework_WebAPI项目_EXCEL数据导出

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项目需要引用NPOI的Nuget包：

A-2--EXCEL数据导出--WebAPI项目--NPOI--接口导出：

说明：以下方法借助第三方插件：NPOI专门处理EXCEL等办公文档的类库，因此项目中需引用该插件，NuGet--所有NPOI即可安装。

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/// <summary>
        /// 班车数据导出成EXCEL
        /// </summary>
        /// <param name="conferenceID"></param>
        /// <returns></returns>
        [HttpGet]
        public HttpResponseMessage ExportExcelDataForBusRoute(string conferenceID)
        {
            HttpResponseMessage result = new HttpResponseMessage();
            ControllerHelp.RunAction(() =>
            {
                BusRouteModelCollection busColl = BusRouteModelAdapter.Instance.Load(m => m.AppendItem("ConferenceID", conferenceID));
                //如果想要某个单元格内容显示多列，在内容中加入： "\n"  换行字符
                Dictionary<string, string> dicColl = new Dictionary<string, string>() {
                    {"路线标题","Title" },
                    {"发车时间","DepartDate" },
                    {"出发地","BeginPlace" },
                    {"对接人","ContactsName" },
                    {"对接人电话","ContactsPhone" }
                };
                result = ExcelHelp<BusRouteModel, BusRouteModelCollection>.ExportExcelData(dicColl, busColl, "BusRoute");
            });
            return result;
        }

　　　　　/// <summary>
        /// 得到excel文件流
        /// </summary>
        /// <returns></returns>
        private MemoryStream ExcelStream(Dictionary<string, string> displayAndColumnName, TCollection tlist)
        {
            //var list = dc.v_bs_dj_bbcdd1.Where(eps).ToList();
            HSSFWorkbook workbook = new HSSFWorkbook();

            ISheet sheet1 = workbook.CreateSheet("Sheet1");

            //1-创建首行
            IRow headRow = sheet1.CreateRow(0);
            //1.1-设置首行样式
            IFont font = workbook.CreateFont();
            font.Boldweight = (short)FontBoldWeight.Bold;   //字体加粗
            ICellStyle headCellStyle = workbook.CreateCellStyle();
            headCellStyle.SetFont(font);
            headCellStyle.Alignment = HorizontalAlignment.Center;  //字体居中

            List<string> displayNameList = displayAndColumnName.Keys.ToList();
            //1.2-设置首行标题
            for (var i = 0; i < displayAndColumnName.Keys.Count; i++)
            {
                ICell cell = headRow.CreateCell(i);
                cell.SetCellValue(displayNameList[i].ToString());
                cell.CellStyle = headCellStyle;
            }
            //2-设置内容列
            List<string> columnNameList = displayAndColumnName.Values.ToList();
            //2.1-内容行样式
            ICellStyle contentCellStyle = workbook.CreateCellStyle();
            contentCellStyle.Alignment = HorizontalAlignment.Center;  //字体居中
            contentCellStyle.WrapText = true;  //自动换行
            for (var i = 0; i < tlist.Count; i++)
            {
                IRow row = sheet1.CreateRow(i + 1);
                //设置内容
                for (var j = 0; j < columnNameList.Count; j++)
                {
                    ICell cell = row.CreateCell(j);
                    cell.SetCellValue(getPropertyValue(tlist[i], columnNameList[j]));
                    cell.CellStyle = contentCellStyle;
                }
            }
        //3-自动列宽-根据内容长度自动展开
            for (int i = 0; i < displayNameList.Count; i++)
            {
                sheet1.AutoSizeColumn(i);
            }

            MemoryStream file = new MemoryStream();
            workbook.Write(file);
            //这句代码非常重要，如果不加，会报：打开的EXCEL格式与扩展名指定的格式不一致
            file.Seek(0, SeekOrigin.Begin);

            return file;
        }
        /// <summary>
        /// 导出excel功能控制器
        /// </summary>
        /// <returns></returns>
        public HttpResponseMessage ExportExcelDataForWebAPI(Dictionary<string, string> displayAndColumnName, TCollection tlist,string exportFileName)
        {
            var file = ExcelStream(displayAndColumnName, tlist);
            HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
            result.Content = new StreamContent(file);
            result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.ms-excel");
            result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
            result.Content.Headers.ContentDisposition.FileName = exportFileName+".xls";
            return result;
        }