public class ExcelHelper : IDisposable

    {

        private string fileName = null; //文件名

        private IWorkbook workbook = null;

        private FileStream fs = null;

        private bool disposed;

        public ExcelHelper(string fileName)

        {

            this.fileName = fileName;

            disposed = false;

        }

        /// <summary>

        /// 将DataTable数据导入到excel中

        /// </summary>

        /// <param name="data">要导入的数据</param>

        /// <param name="isColumnWritten">DataTable的列名是否要导入</param>

        /// <param name="sheetName">要导入的excel的sheet的名称</param>

        /// <returns>导入数据行数(包含列名那一行)</returns>

        public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)

        {

            int i = ;

            int j = ;

            int count = ;

            ISheet sheet = null;

            fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);

            if (fileName.IndexOf(".xlsx") > ) // 2007版本

                workbook = new XSSFWorkbook();

            else if (fileName.IndexOf(".xls") > ) // 2003版本

                workbook = new HSSFWorkbook();

            try

            {

                if (workbook != null)

                {

                    sheet = workbook.CreateSheet(sheetName);

                }

                else

                {

                    return -;

                }

                if (isColumnWritten == true) //写入DataTable的列名

                {

                    IRow row = sheet.CreateRow();

                    for (j = ; j < data.Columns.Count; ++j)

                    {

                        row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);

                    }

                    count = ;

                }

                else

                {

                    count = ;

                }

                for (i = ; i < data.Rows.Count; ++i)

                {

                    IRow row = sheet.CreateRow(count);

                    for (j = ; j < data.Columns.Count; ++j)

                    {

                        row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());

                    }

                    ++count;

                }

                workbook.Write(fs); //写入到excel

                return count;

            }

            catch (Exception ex)

            {

                Console.WriteLine("Exception: " + ex.Message);

                return -;

            }

        }

        /// <summary>

        /// 将excel中的数据导入到DataTable中

        /// </summary>

        /// <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 sheetName, bool isFirstRowColumn)

        {

            ISheet sheet = null;

            DataTable data = new DataTable();

            int startRow = ;

            try

            {

                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);

                if (fileName.IndexOf(".xlsx") > ) // 2007版本

                    workbook = new XSSFWorkbook(fs);

                else if (fileName.IndexOf(".xls") > ) // 2003版本

                    workbook = new HSSFWorkbook(fs);

                if (sheetName != null)

                {

                    sheet = workbook.GetSheet(sheetName);

                    if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet

                    {

                        sheet = workbook.GetSheetAt();

                    }

                }

                else

                {

                    sheet = workbook.GetSheetAt();

                }

                if (sheet != null)

                {

                    IRow firstRow = sheet.GetRow();

                    int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数

                    if (isFirstRowColumn)

                    {

                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)

                        {

                            ICell cell = firstRow.GetCell(i);

                            if (cell != null)

                            {

                                string cellValue = cell.StringCellValue;

                                if (cellValue != null)

                                {

                                    DataColumn column = new DataColumn(cellValue);

                                    data.Columns.Add(column);

                                }

                            }

                        }

                        startRow = sheet.FirstRowNum + ;

                    }

                    else

                    {

                        startRow = sheet.FirstRowNum;

                    }

                    //最后一列的标号

                    int rowCount = sheet.LastRowNum;

                    for (int i = startRow; i <= rowCount; ++i)

                    {

                        IRow row = sheet.GetRow(i);

                        if (row == null) continue; //没有数据的行默认是null　　　　　　　

                        DataRow dataRow = data.NewRow();

                        for (int j = row.FirstCellNum; j < cellCount; ++j)

                        {

                            if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null

                                dataRow[j] = row.GetCell(j).ToString();

                        }

                        data.Rows.Add(dataRow);

                    }

                }

                return data;

            }

            catch (Exception ex)

            {

                Console.WriteLine("Exception: " + ex.Message);

                return null;

            }

        }

        public void Dispose()

        {

            Dispose(true);

            GC.SuppressFinalize(this);

        }

        protected virtual void Dispose(bool disposing)

        {

            if (!this.disposed)

            {

                if (disposing)

                {

                    if (fs != null)

                        fs.Close();

                }

                fs = null;

                disposed = true;

            }

        }

    }