封装NPOI导出含下拉列表的Excel

 /// <summary>
        /// 绑定数据的方法
        /// </summary>
        /// <param name="ssfworkbook">HSSFWorkbook</param>
        /// <param name="sheet1">HSSFSheet</param>
        /// <param name="cateDt">数据源</param>
        /// <param name="sheetName">页名</param>
        /// <param name="dispName">显示名称</param>
        /// <param name="row">属于第几列</param>
        /// <param name="nextCount">相隔下一列的位置(只要有一列为1，后面便都为1，以此类推)</param>
        private void GetCategoryData(HSSFWorkbook ssfworkbook, HSSFSheet sheet1, DataTable cateDt, string sheetName, string dispName, int row, int nextCount)
        {
            try
            {
                HSSFSheet sheet2 = ssfworkbook.CreateSheet("Sht" + sheetName);
                int indexCate = 0;
                ssfworkbook.SetSheetHidden(row - nextCount, true);//隐藏

                foreach (DataRow cateItem in cateDt.Rows)
                {
                    sheet2.CreateRow(indexCate).CreateCell(0).SetCellValue(cateItem[dispName].ToString());//列数据
                    indexCate++;
                }
                HSSFName range = ssfworkbook.CreateName();//创建名称
                range.Reference = "Sht" + sheetName + "!$A$1:$A$" + indexCate;//格式
                range.NameName = sheetName;

                //将下拉列表添加
                CellRangeAddressList regions = null;
                regions = new CellRangeAddressList(1, 65535, row - 1, row - 1);
                DVConstraint constraint = DVConstraint.CreateFormulaListConstraint(sheetName);
                HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
                sheet1.AddValidationData(dataValidate);
            }
            catch { }
        }

   /// <summary>
        /// 设置Excel表头(数组Length必须相同)
        /// </summary>
        /// <param name="strName">Excel中的名称</param>
        /// <param name="width">宽</param>
        /// <param name="headerRow">HSSFRow</param>
        /// <param name="sheet1">HSSFSheet</param>
        /// <param name="HSSFWorkbook">ssfworkbook</param>
        private string SetUpExcelTitle(HSSFWorkbook ssfworkbook, string[] strName, int[] width, HSSFRow headerRow, HSSFSheet sheet1)
        {
            try
            {
                if (strName.Length != width.Length)
                {
                    return "数组长度不同！";
                }
                HSSFFont fontTitle = ssfworkbook.CreateFont();
                fontTitle.FontHeightInPoints = 11;
                fontTitle.Boldweight = HSSFFont.BOLDWEIGHT_NORMAL;
                HSSFCellStyle hssfCellTitle = ssfworkbook.CreateCellStyle();
                hssfCellTitle.SetFont(fontTitle);

                for (int i = 0; i < strName.Length; i++)
                {
                    //设置表头
                    headerRow.CreateCell(i).SetCellValue(strName[i]);
                    //设置表头的宽度 
                    sheet1.SetColumnWidth(i, width[i]);
                    headerRow.GetCell(i).CellStyle = hssfCellTitle;
                }
                return "ok";
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }

 /// <summary>
        /// 设置Excel内容
        /// </summary>
        /// <param name="values">内容</param>
        /// <param name="dataRow">HSSFRow</param>
        private void SetUpExcelContent(string[] values, HSSFRow dataRow)
        {
            for (int i = 0; i < values.Length; i++)
            {
                //填充数据
                dataRow.CreateCell(i).SetCellValue(values[i]);
            }
        }