導入excel中的數据到DataTable

/// <summary>
    /// 導入excel中的數据到DataTable中
    /// </summary>
    /// <param name="sheetName">excel工作薄sheet的名稱</param>
    /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
    /// <returns>返回的DataTable</returns>
    private DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
    {
        FileStream fs = null;
        ISheet sheet = null;
        IWorkbook workbook = null;
        DataTable data = new DataTable();
        int startRow = 0;
        try
        {
            fs = new FileStream(strFileName, FileMode.Open, FileAccess.Read);
            if (strFileName.IndexOf(".xlsx") > 0) // 2007版本
                workbook = new XSSFWorkbook(fs);
            else if (strFileName.IndexOf(".xls") > 0) // 2003版本
                workbook = new HSSFWorkbook(fs);
            if (sheetName != null)
            {
                sheet = workbook.GetSheet(sheetName);
                if (sheet == null) //如果有找到指定的sheetName名稱的sheet，默認取第一個sheet
                {
                    sheet = workbook.GetSheetAt(0);
                }
            }
            else
            {
                sheet = workbook.GetSheetAt(0);
            }
            if (sheet != null)
            {
                IRow firstRow = sheet.GetRow(0);
                int cellCount = firstRow.LastCellNum; //一行最後一個cell的編號 即總的列數
                if (isFirstRowColumn)
                {
                    for (int i = firstRow.FirstCellNum; i < cellCount; i++)
                    {
                        ICell cell = firstRow.GetCell(i);
                        string cellValue;
                        if (cell.CellType == CellType.Numeric)
                        {
                            DateTime cellDate = Convert.ToDateTime(cell.DateCellValue.ToString());
                            cellValue = cellDate.ToString("yyyy/MM/dd").Replace("/", "");
                        }
                        else
                        {
                            cellValue = cell.StringCellValue;
                        }

                        if (cell != null || cell.DateCellValue.ToString() == "")
                        {
                            if (cellValue != null || cell.DateCellValue.ToString() == "")
                            {
                                DataColumn column = new DataColumn(cellValue);
                                data.Columns.Add(column);
                            }
                        }
                    }
                    startRow = sheet.FirstRowNum + 1;
                }
                else
                {
                    startRow = sheet.FirstRowNum;
                }
                //最后一列的標號
                int rowCount = sheet.LastRowNum;
                for (int i = startRow; i <= rowCount; i++)
                {
                    IRow row = sheet.GetRow(i);
                    string ss = row.GetCell(0).ToString();
                    if (row != null)
                    {
                        if (ss != "")
                        {
                            DataRow dataRow = data.NewRow();
                            for (int j = row.FirstCellNum; j < cellCount; j++)
                            {
                                if (row.GetCell(j) != null)//同理沒有數据的行默認是null　　
                                {
                                    dataRow[j] = row.GetCell(j).ToString();
                                }
                            }
                            data.Rows.Add(dataRow);
                        }
                    }
                    else
                    {
                        break;
                    }
                }
            }
            if (fs != null) fs.Close();
            return data;
        }
        catch (Exception ex)
        {
            if (fs != null) fs.Close();
            Console.WriteLine("Exception: " + ex.Message);
            return null;
        }
    }