前臺代碼：

前臺代碼是在.net core bootstrap集成框架上的（這是效果瀏覽地址：http://core.jucheap.com），首先是添加Nuget包，

 <button id="btnExport" type="button" class="btn btn-info " onclick="exportModel()"><i class="fa fa-paste"></i> 導出Excel</button>





 function exportModel() { //導出
            var delDatas = JucheapGrid.GetDataTableDeleteData();
            if (delDatas.Len > 0 && delDatas.Data.length > 0) {
                if (confirm("確認要導出這" + delDatas.Len + "條數據？")) {
  
                        //  delDatas.Data  傳入的id值                                           
                    window.location.href = "/***/***?id=" + delDatas.Data;
                }
            } else {
                alert("請選擇要導出的數據！");
            }
        }

　　下面就是控制器代碼：

   #region 導出Excel.xlsx文件
        public IActionResult ExportText()
        {

            string sWebRootFolder = _hostingEnvironment.WebRootPath;
            string sFileName = $"{DateTime.Now.ToString("yyyyMMddHHmmssfff")}.xlsx";
            FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
            if (file.Exists)
            {
                file.Delete();
                file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
            }
            using (ExcelPackage package = new ExcelPackage(file))
            {
               string str = Request.Query["id"];//獲取傳過來的id
                String[] str1 = str.Split(",");
                long[] ids = new long[str1.Length];
                for (int i = 0; i < str1.Length; i++)
                {
                    ids[i] = long.Parse(str1[i]);//裝成long數組
                }
             //根據id在數據庫獲取集合
                IList<FeedbackDto> collection = _usermanagementservice.GetExportAsync(ids);
                // 添加worksheet
                ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("意見反饋列表");
                worksheet.Cells[1, 1].Value = "***";//這的*號表示的是導出後列的名稱
                worksheet.Cells[1, 2].Value = "***";
                worksheet.Cells[1, 3].Value = "***";
                worksheet.Cells[1, 4].Value = "*** ";
                worksheet.Cells[1, 5].Value = "***";
                worksheet.Cells[1, 6].Value = "***";
                worksheet.Cells[1, 7].Value = "***";
                worksheet.Cells[1, 8].Value = "***";
                worksheet.Cells[1, 1].Style.Font.Bold = true;
                worksheet.Cells[1, 2].Style.Font.Bold = true;
                worksheet.Cells[1, 3].Style.Font.Bold = true;
                worksheet.Cells[1, 4].Style.Font.Bold = true;
                worksheet.Cells[1, 5].Style.Font.Bold = true;
                worksheet.Cells[1, 6].Style.Font.Bold = true;
                worksheet.Cells[1, 7].Style.Font.Bold = true;
                worksheet.Cells[1, 8].Style.Font.Bold = true;
                for (int i = 0; i < collection.Count; i++)
                {
                    worksheet.Cells[2 + i, 1].Value = collection[i].*;//這的*是字段名
                    worksheet.Cells[2 + i, 2].Value = collection[i].*;
                    worksheet.Cells[2 + i, 3].Value = collection[i].*;
                    worksheet.Cells[2 + i, 4].Value = collection[i].*;
                    worksheet.Cells[2 + i, 5].Value = collection[i].*;
                    worksheet.Cells[2 + i, 6].Value = collection[i].*;
                    worksheet.Cells[2 + i, 7].Value = collection[i].CreateTime.ToString();//日期tostring一下，不然是亂的
                    worksheet.Cells[2 + i, 8].Value = collection[i].UpdateTime.ToString();
                }
                package.Save();

            }
           
            return File(sFileName, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", sFileName);
        }

　　新手代碼，大神勿噴，

.NET Core 通過EPPlus批量導出