c# 导出excel格式xlsx

　　　　　　　　  string sb="";//sql字符串               
　　　　　　　　　AttachmentConfigSection configSection = ConfigurationManager.GetSection("AttachmentConfig") as AttachmentConfigSection;
               string path = "";
               string sheetName = "Sheet1";
               string fileName = "月结状态处理.xlsx";
               if (!string.IsNullOrEmpty(configSection.ElementInformation.Source))
               {
                   path = configSection.TargetPath.Path;
               }
               else
               {
                   errormsg = "模版不正确";
               }
               WriteLog("xiujiamontyle  123....."+sb.ToString());
               string index = "\Upload\XiuJiaMontly\" + fileName;
               string descFile = path + index.ToString();
               FileInfo fileinfo = new FileInfo(descFile);
               ExcelPackage excel = new ExcelPackage(fileinfo);
               ExcelWorksheet sheet = excel.Workbook.Worksheets[sheetName];
               DataTable dt = DBHelperExtend.Query(sb.ToString()).Tables[0];
               int row = dt.Rows.Count;    //行

               sheet.Cells[1, 1].Value = "任务编号";
               sheet.Cells[1, 2].Value = "月结状态";
               sheet.Cells[1, 3].Value = "提交人";
               sheet.Cells[1, 4].Value ="员工编号";
                sheet.Cells[1, 5].Value ="部门";
                sheet.Cells[1, 6].Value ="区域";
                sheet.Cells[1, 7].Value ="休假类别";
                sheet.Cells[1, 8].Value ="是否住院";
                sheet.Cells[1, 9].Value ="原因";
                sheet.Cells[1, 10].Value ="休假时间";
                sheet.Cells[1, 11].Value = "天数时数";
                sheet.Cells[1, 12].Value = "提交日期";
                sheet.Cells[1, 13].Value = "状态";
                sheet.Cells[1, 14].Value = "撤回编号";
                sheet.Cells[1, 15].Value = "撤回日期";
                sheet.Cells[1, 16].Value = "撤回状态";
                sheet.Cells[1, 17].Value = "用年假抵扣";

               for (int i = 0; i < dt.Rows.Count; i++)
               {
                   sheet.Cells[i + 2, 1].Value = dt.Rows[i]["TaskID"];
                   sheet.Cells[i + 2, 2].Value = dt.Rows[i]["monthlyStatus"];
                   sheet.Cells[i + 2, 3].Value = dt.Rows[i]["RequestAccount"];
                   sheet.Cells[i + 2, 4].Value = dt.Rows[i]["hrid"];
                   sheet.Cells[i + 2, 5].Value = dt.Rows[i]["RequestDept"];
                   sheet.Cells[i + 2, 6].Value = dt.Rows[i]["RequestLocation"];
                   sheet.Cells[i + 2, 7].Value = dt.Rows[i]["XiuJiaType"];
                   sheet.Cells[i + 2, 8].Value = dt.Rows[i]["IsInHospital"];
                   sheet.Cells[i + 2, 9].Value = dt.Rows[i]["Description"];
                   sheet.Cells[i + 2, 10].Value = dt.Rows[i]["XiuJiaDate"];
                   sheet.Cells[i + 2, 11].Value = dt.Rows[i]["TotalTime"];
                   sheet.Cells[i + 2, 12].Value = dt.Rows[i]["SubmitTime"];
                   sheet.Cells[i + 2, 13].Value = dt.Rows[i]["Status"];
                   sheet.Cells[i + 2, 14].Value = dt.Rows[i]["CH_TaskID"];
                   sheet.Cells[i + 2, 15].Value = dt.Rows[i]["cheHuiTime"];
                   sheet.Cells[i + 2, 16].Value = dt.Rows[i]["cheHuiStatus"];                   
                   sheet.Cells[i + 2, 17].Value = dt.Rows[i]["AnnualDeductible"];
               }
               byte[] b = excel.GetAsByteArray();
               HttpContext curContext = System.Web.HttpContext.Current;
               // curContext.Response.ContentType = "application/vnd.ms-excel";
               curContext.Response.ContentType = "text/plain";//Content-Disposition
               // curContext.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
               curContext.Response.AddHeader("content-disposition", "attachment;  filename=XiuJiaMonthlyHandel.xlsx");
               curContext.Response.Charset = "gb2312";  //必须写，否则会有乱码
               curContext.Response.ContentEncoding = System.Text.Encoding.UTF7;  //必须写，否则会有乱码

               curContext.Response.AddHeader("Content-Length", b.Length.ToString());
               curContext.Response.BinaryWrite(b);
               curContext.Response.End();