c# NPOI文件操作

public static Byte[] RenderDataToExcel<T>(List<T> SourceList, List<String> filter) where T : new()
        {
            XSSFWorkbook workbook = null;
            MemoryStream ms = null;
            ISheet sheet = null;
            XSSFRow headerRow = null;
            try
            {
                workbook = new XSSFWorkbook();
                ms = new MemoryStream();
                sheet = workbook.CreateSheet();
                headerRow = (XSSFRow)sheet.CreateRow();

                PropertyInfo[] arrProperty = RemoveFilterColumn<T>(filter);

                PropertyInfo pi = null;
                for (int i = ; i < arrProperty.Length; i++)
                {
                    pi = arrProperty[i];
                    headerRow.CreateCell(i).SetCellValue(GetPropertyDescription(pi));
                }

                int rowIndex = ;
                for (int i = ; i < SourceList.Count; i++)
                {
                    XSSFRow dataRow = (XSSFRow)sheet.CreateRow(rowIndex);
                    for (int j = ; j < arrProperty.Length; j++)
                    {
                        pi = arrProperty[j];
                        object piValue = pi.GetValue(SourceList[i], null);
                        if (piValue == null)
                        {
                            dataRow.CreateCell(j).SetCellValue("");
                            continue;
                        }
                        Type pitype = pi.PropertyType;
                        if (pitype.Name.ToLower().Contains("nullable"))
                        {
                            pitype = Nullable.GetUnderlyingType(pitype);
                        }
                        //var rowNumberAttr = pi.GetCustomAttributes(typeof(Attribute), false);
                        //if (rowNumberAttr != null && rowNumberAttr.Length > 0)
                        //{
                        //    dataRow.CreateCell(j).SetCellValue((i + 1).ToString());
                        //    continue;
                        //}
                        if (pitype == typeof(bool))
                        {
                            dataRow.CreateCell(j).SetCellValue(Convert.ToBoolean(piValue) ? "是" : "否");
                            continue;
                        }
                        if (pitype.IsEnum)
                        {
                            dataRow.CreateCell(j).SetCellValue(EnumHelper.GetDescription(pitype, Convert.ToInt32(piValue)));
                            continue;
                        }
                        if (pitype == typeof(DateTime)
                            || pitype == typeof(DateTime?))
                        {
                            //var showDateTimeAttr = pi.GetCustomAttributes(typeof(DateTimeFormatAttribute), false);
                            //if (showDateTimeAttr != null && showDateTimeAttr.Length > 0)
                            //{
                            //    DateTime nowtime = DateTime.Parse(piValue.ToString());
                            //    arrData[i + 1, j] = nowtime.ToString((showDateTimeAttr[0] as DateTimeFormatAttribute).DataFormatString);
                            //    continue;
                            //}

                            //default datetime showformater
                            dataRow.CreateCell(j).SetCellValue(DateTime.Parse(piValue.ToString()).ToString("yyyy-MM-dd HH:mm:ss"));
                            continue;
                        }
                        dataRow.CreateCell(j).SetCellValue(piValue.ToString());
                    }
                    ++rowIndex;
                }
                //列宽自适应，只对英文和数字有效 这个动作比较耗时间
                //for (int i = 0; i <= arrProperty.Length; ++i)
                //    sheet.AutoSizeColumn(i);
                workbook.Write(ms);
                ms.Flush();
                return ms.ToArray();
            }
            catch (Exception ex)
            {
                Log.loggeremail.Error("RenderDataTableToExcel Exception："+ex.Message);
                return null;
            }
            finally
            {
                ms.Close();
                sheet = null;
                headerRow = null;
                workbook = null;
            }
        }

        public static void SaveListToExcel<T>(List<T> SourceList, List<String> filter, string filePath) where T : new()
        {
            XSSFWorkbook workbook = null;
            ISheet sheet = null;
            XSSFRow headerRow = null;
            try
            {
                workbook = new XSSFWorkbook();
                sheet = workbook.CreateSheet();
                headerRow = (XSSFRow)sheet.CreateRow();

                PropertyInfo[] arrProperty = RemoveFilterColumn<T>(filter);

                PropertyInfo pi = null;
                for (int i = ; i < arrProperty.Length; i++)
                {
                    pi = arrProperty[i];
                    headerRow.CreateCell(i).SetCellValue(GetPropertyDescription(pi));
                }

                int rowIndex = ;
                for (int i = ; i < SourceList.Count; i++)
                {
                    XSSFRow dataRow = (XSSFRow)sheet.CreateRow(rowIndex);
                    for (int j = ; j < arrProperty.Length; j++)
                    {
                        pi = arrProperty[j];
                        object piValue = pi.GetValue(SourceList[i], null);
                        if (piValue == null)
                        {
                            dataRow.CreateCell(j).SetCellValue("");
                            continue;
                        }
                        Type pitype = pi.PropertyType;
                        if (pitype.Name.ToLower().Contains("nullable"))
                        {
                            pitype = Nullable.GetUnderlyingType(pitype);
                        }
                        //var rowNumberAttr = pi.GetCustomAttributes(typeof(Attribute), false);
                        //if (rowNumberAttr != null && rowNumberAttr.Length > 0)
                        //{
                        //    dataRow.CreateCell(j).SetCellValue((i + 1).ToString());
                        //    continue;
                        //}
                        if (pitype == typeof(bool))
                        {
                            dataRow.CreateCell(j).SetCellValue(Convert.ToBoolean(piValue) ? "是" : "否");
                            continue;
                        }
                        if (pitype.IsEnum)
                        {
                            dataRow.CreateCell(j).SetCellValue(EnumHelper.GetDescription(pitype, Convert.ToInt32(piValue)));
                            continue;
                        }
                        if (pitype == typeof(DateTime)
                            || pitype == typeof(DateTime?))
                        {
                            //var showDateTimeAttr = pi.GetCustomAttributes(typeof(DateTimeFormatAttribute), false);
                            //if (showDateTimeAttr != null && showDateTimeAttr.Length > 0)
                            //{
                            //    DateTime nowtime = DateTime.Parse(piValue.ToString());
                            //    arrData[i + 1, j] = nowtime.ToString((showDateTimeAttr[0] as DateTimeFormatAttribute).DataFormatString);
                            //    continue;
                            //}

                            //default datetime showformater
                            dataRow.CreateCell(j).SetCellValue(DateTime.Parse(piValue.ToString()).ToString("yyyy-MM-dd HH:mm:ss"));
                            continue;
                        }
                        dataRow.CreateCell(j).SetCellValue(piValue.ToString());
                    }
                    ++rowIndex;
                }
                //列宽自适应，只对英文和数字有效 这个动作比较耗时间
                //for (int i = 0; i <= arrProperty.Length; ++i)
                //    sheet.AutoSizeColumn(i);

                using (var file = new FileStream(filePath, FileMode.Create))
                {
                    workbook.Write(file);
                    file.Close();
                    file.Dispose();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                sheet = null;
                headerRow = null;
                workbook = null;
            }
        }

        /// <summary>
        /// 创建一个excel
        /// </summary>
        /// <returns></returns>
        public static XSSFWorkbook CreateXSSFWorkbook()
        {
            XSSFWorkbook xssfworkbook = new XSSFWorkbook();
            return xssfworkbook;
        }

        /// <summary>
        /// 创建一个sheet
        /// </summary>
        /// <param name="hssfworkbook">excel</param>
        /// <param name="sheetName">sheet名称</param>
        /// <param name="isFreezePane">是否存在冻结</param>
        /// <param name="colSplit"></param>
        /// <param name="rowSplit">行数</param>
        /// <param name="leftmostColumn"></param>
        /// <param name="topRow">顶上N行</param>
        /// <returns></returns>
        public static ISheet CreateSheet(XSSFWorkbook xssfworkbook, string sheetName, bool isFreezePane = false, int colSplit = , int rowSplit = , int leftmostColumn = , int topRow = )
        {
            ISheet sheet1 = xssfworkbook.CreateSheet(sheetName);

            if (isFreezePane)
            {
                sheet1.CreateFreezePane(colSplit, rowSplit, leftmostColumn, topRow);
            }

            return sheet1;
        }

        public static IRow CreateRow(ISheet sheet, int rowIndex)
        {
            IRow row = sheet.CreateRow(rowIndex);
            return row;
        }

        public static ICell CreateCell(XSSFWorkbook xssfworkbook, IRow row, int cellIndex, string cellValue, bool isLock = true)
        {
            ICell cell = row.CreateCell(cellIndex);
            cell.SetCellValue(cellValue);
            //加锁
            var locked = xssfworkbook.CreateCellStyle();
            locked.IsLocked = isLock;
            cell.CellStyle = locked;

            return cell;
        }

        public static ICellStyle LockedRow(XSSFWorkbook xssfworkbook)
        {
            var locked = xssfworkbook.CreateCellStyle();
            locked.IsLocked = true;
            return locked;
        }

        public static ICellStyle UnLockedRow(XSSFWorkbook xssfworkbook)
        {
            var locked = xssfworkbook.CreateCellStyle();
            locked.IsLocked = false;
            return locked;
        }

        /// <summary>
        /// 获取单元格样式
        /// </summary>
        /// <param name="hssfworkbook">Excel操作类</param>
        /// <param name="font">单元格字体</param>
        /// <param name="fillForegroundColor">图案的颜色</param>
        /// <param name="fillPattern">图案样式</param>
        /// <param name="fillBackgroundColor">单元格背景</param>
        /// <param name="ha">垂直对齐方式</param>
        /// <param name="va">垂直对齐方式</param>
        /// <returns></returns>
        public static ICellStyle GetCellStyle(XSSFWorkbook hssfworkbook, IFont font, HSSFColor fillForegroundColor, FillPattern fillPattern, HSSFColor fillBackgroundColor, NPOI.SS.UserModel.HorizontalAlignment ha, VerticalAlignment va, bool hasBorder)
        {
            ICellStyle cellstyle = hssfworkbook.CreateCellStyle();
            cellstyle.FillPattern = fillPattern;
            cellstyle.Alignment = ha;
            cellstyle.VerticalAlignment = va;
            if (fillForegroundColor != null)
            {
                cellstyle.FillForegroundColor = fillForegroundColor.Indexed;
            }
            if (fillBackgroundColor != null)
            {
                cellstyle.FillBackgroundColor = fillBackgroundColor.Indexed;
            }
            if (font != null)
            {
                cellstyle.SetFont(font);
            }
            if (hasBorder)
            {
                //有边框
                cellstyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
                cellstyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
                cellstyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
                cellstyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
            }
            return cellstyle;
        }

        /// <summary>
        /// 合并单元格
        /// </summary>
        /// <param name="sheet">要合并单元格所在的sheet</param>
        /// <param name="rowstart">开始行的索引</param>
        /// <param name="rowend">结束行的索引</param>
        /// <param name="colstart">开始列的索引</param>
        /// <param name="colend">结束列的索引</param>
        public static void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend)
        {
            CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);
            sheet.AddMergedRegion(cellRangeAddress);
        }

        /// <summary>
        /// 建立下拉，验证数据有效性
        /// </summary>
        /// <param name="hssfworkbook"></param>
        /// <param name="sheet"></param>
        /// <param name="firstRow"></param>
        /// <param name="lastRow"></param>
        /// <param name="firstCol"></param>
        /// <param name="lastCol"></param>
        /// <param name="refersToFormula"></param>
        /// <param name="XSSFName"></param>
        public static void SetValidationData(XSSFWorkbook hssfworkbook, ISheet sheet, int firstRow, int lastRow, int firstCol, int lastCol, string refersToFormula, string XSSFName)
        {
            //数据有效性 下拉
            XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet as XSSFSheet);
            //位置
            CellRangeAddressList regions = new CellRangeAddressList(firstRow, lastRow, firstCol, lastCol);

            XSSFName range = (XSSFName)hssfworkbook.CreateName();
            range.RefersToFormula = refersToFormula;
            range.NameName = XSSFName;
            XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint)dvHelper.CreateFormulaListConstraint(XSSFName);

            XSSFDataValidation dataValidate = (XSSFDataValidation)dvHelper.CreateValidation(dvConstraint, regions);
            sheet.AddValidationData(dataValidate);
        }

调用：

List<String> filter = new List<string>();
filter.Add("LableBatchNo");//过滤列
byte[] byteList = ExcelHelper.RenderToExcel<SecurityLabelModel>(allList, filter);
MemoryStream stream = new MemoryStream(byteList);
                stream.Seek(, );

                return new FileStreamResult(stream, "application/vnd.ms-excel") { FileDownloadName = HttpUtility.UrlPathEncode(名称 + DateTime.Now.ToString("yyyyMMddHHmmssfff") + 后缀) };