C#導出execl帶下拉項數據巨多方案

這個方法可以解決大數據下拉問題

/// <summary>
        /// 這個是正對整個execel 不是針對某列，所有必須有 IWorkbook workbook, 解決下拉數據量過多，導出之後點擊沒有反應
        /// </summary>
        /// <param name="workbook"></param>
        /// <param name="sheet"></param>
        /// <param name="firstRow"></param>
        /// <param name="lastRow"></param>
        /// <param name="firstCol"></param>
        /// <param name="lastCol"></param>
        /// <param name="vals"></param>
        private static void SetCellDropdownListHasError2(IWorkbook workbook,ISheet sheet, int firstRow, int lastRow, int firstCol, int lastCol, string[] vals)
        {
            var helper = new XSSFDataValidationHelper((XSSFSheet)sheet);
            var typesRegions = new CellRangeAddressList(firstRow, lastRow, firstCol, lastCol);
            var sheetIndex = 0;
            if (vals.Length > 50)
            {
                var sheetTmpName = "數據源表";
                sheetIndex++;
                ISheet sheetTmp = workbook.CreateSheet(sheetTmpName);
                //隱藏
                workbook.SetSheetHidden(sheetIndex, SheetState.Hidden);
                int index = 0;
                foreach (var item in vals)
                {
                    sheetTmp.CreateRow(index).CreateCell(0).SetCellValue(item);
                    index++;
                }
                //創建的下拉項的區域：
                var rangeName = sheetTmpName + "Range";
                IName range = workbook.CreateName();
                range.RefersToFormula = sheetTmpName + "!$A$1:$A$" + index;
                range.NameName = rangeName;

                #region 創建約束
                var typesValidation = helper.CreateValidation(helper.CreateFormulaListConstraint(rangeName), typesRegions);
                typesValidation.CreateErrorBox("輸入不合法", "請輸入或選擇下拉列表中的值。");
                #endregion

                typesValidation.ShowPromptBox = true;
                sheet.AddValidationData(typesValidation);
            }
            else
            {
                var typesValidation = helper.CreateValidation(helper.CreateExplicitListConstraint(vals), typesRegions);
                typesValidation.CreateErrorBox("輸入不合法", "請輸入下拉列表中的值！");
                typesValidation.ShowErrorBox = true;
                sheet.AddValidationData(typesValidation);
            }
        }

調用

SetCellDropdownListHasError2(workbook, sheet, 1, dtSource.Rows.Count, 3, 3, flav.ToArray());

效果圖

 

參考：https://www.cnblogs.com/wshisboy/p/7887363.html