通过NPOI导入Execl返回DataTable

<strong><span style="font-size:18px;">导入Execl文件方法：</span></strong>

        /// <summary>
        /// 将excel中的数据导入到DataTable中
        /// </summary>
        /// <param name="fileName">execl文件路径名称</param>
        /// <param name="sheetName">excel工作薄sheet的名称</param>
        /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
        /// <returns>返回的DataTable</returns>
        public DataTable ExcelToDataTable(string fileName, string sheetName, bool isFirstRowColumn)
        {
            IWorkbook workbook = null;
            var data = new DataTable();
            try
            {
                var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                // 2007版本
                if (fileName != null && fileName.IndexOf(".xlsx") > 0)
                {
                    workbook = new XSSFWorkbook(fs);
                }
                // 2003版本
                else if (fileName != null && fileName.IndexOf(".xls") > 0)
                {
                    workbook = new HSSFWorkbook(fs);
                }

                var sheet = sheetName != null ? workbook.GetSheet(sheetName) : workbook.GetSheetAt(0);

                if (sheet == null) return data;

                var firstRow = sheet.GetRow(0);
                //一行最后一个cell的编号 即总的列数
                int cellCount = firstRow.LastCellNum;
                var startRow = 0;

                if (isFirstRowColumn)
                {
                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                    {
                        var column = new DataColumn(firstRow.GetCell(i).StringCellValue);
                        data.Columns.Add(column);
                    }
                    startRow = sheet.FirstRowNum + 1;
                }
                else
                {
                    startRow = sheet.FirstRowNum;
                }

                //最后一列的标号
                var rowCount = sheet.LastRowNum;
                for (var i = startRow; i <= rowCount; ++i)
                {
                    var row = sheet.GetRow(i);
                    //没有数据的行默认是null
                    if (row == null) continue;

                    var dataRow = data.NewRow();
                    for (int j = row.FirstCellNum; j < cellCount; ++j)
                    {
                        //同理，没有数据的单元格都默认是null
                        if (row.GetCell(j) != null)
                        {
                            dataRow[j] = row.GetCell(j).ToString();
                        }
                    }
                    data.Rows.Add(dataRow);
                }
                return data;
            }
            catch (Exception ex)
            {
                return null;
            }
        }

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