/// <summary>

        /// 写入到Excel表格文件当中，导出数据

        /// </summary>

        /// <param name="dt"></param>

        /// <returns></returns>

        public bool DataTableToExcel(DataTable dt, string DataFile)

        {

            bool result = false;

            IWorkbook workbook = null;

            FileStream fs = null;

            IRow row = null;

            ISheet sheet = null;

            ICell cell = null;

            try

            {

                if (dt != null && dt.Rows.Count > 0)

                {

                    workbook = new HSSFWorkbook();

                    string NowBOPName = this.CmbBOPName.Text.Trim();

                    sheet = workbook.CreateSheet(NowBOPName);//创建一个名称为Sheet0的表

                    int rowCount = dt.Rows.Count;//行数

                    int columnCount = dt.Columns.Count;//列数  

                    //把A0:C0合并为一个单元格 并赋值

                    ICell hbcell = sheet.CreateRow(0).CreateCell(0);

                    hbcell.SetCellValue(NowBOPName + "工序");

                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 2));

                    //设置样式 居中 字体

                    ICellStyle hbstyle = workbook.CreateCellStyle();

                    hbstyle.VerticalAlignment = VerticalAlignment.Center;

                    hbstyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;

                    IFont hbfont = workbook.CreateFont();

                    hbfont.FontHeight = 15 * 20;

                    hbstyle.SetFont(hbfont);

                    hbcell.CellStyle = hbstyle;

                    //设置列头

                    row = sheet.CreateRow(1);//excel第一行设为标题，第二行列头

                    for (int c = 0; c < columnCount; c++)

                    {

                        cell = row.CreateCell(c);

                        cell.SetCellValue(dt.Columns[c].ColumnName);

                    }

                    //设置每行每列的单元格,

                    for (int i = 0; i < rowCount; i++)

                    {

                        row = sheet.CreateRow(i + 2);//excel第三行开始写入数据

                        for (int j = 0; j < columnCount; j++)

                        {

                            cell = row.CreateCell(j);

                            cell.SetCellValue(dt.Rows[i][j].ToString());

                        }

                    }

                    using (fs = File.OpenWrite(DataFile))

                    {

                        workbook.Write(fs);//向打开的这个xls文件中写入数据

                        result = true;

                    }

                }

                return result;

            }

            catch (Exception ex)

            {

                if (fs != null)

                {

                    fs.Close();

                }

                return false;

            }

        }

   /// <summary>

        /// 将excel导入到datatable

        /// </summary>

        /// <param name="filePath">excel路径</param>

        /// <param name="isColumnName">第一行是否是列名</param>

        /// <returns>返回datatable</returns>

        public static DataTable ExcelToDataTable(string filePath, bool isColumnName)

        {

            DataTable dataTable = null;

            FileStream fs = null;

            DataColumn column = null;

            DataRow dataRow = null;

            IWorkbook workbook = null;

            ISheet sheet = null;

            IRow row = null;

            ICell cell = null;

            int startRow = 0;

            try

            {

                using (fs = File.OpenRead(filePath))

                {

                    // 2007版本

                    if (filePath.IndexOf(".xlsx") > 0)

                        workbook = new XSSFWorkbook(fs);

                    // 2003版本

                    else if (filePath.IndexOf(".xls") > 0)

                        workbook = new HSSFWorkbook(fs);

                    if (workbook != null)

                    {

                        sheet = workbook.GetSheetAt(0);//读取第一个sheet，当然也可以循环读取每个sheet

                        dataTable = new DataTable();

                        if (sheet != null)

                        {

                            int rowCount = sheet.LastRowNum;//总行数

                            if (rowCount > 0)

                            {

                                IRow firstRow = sheet.GetRow(1);//第二行列名

                                int cellCount = firstRow.LastCellNum;//列数

                                //构建datatable的列

                                if (isColumnName)

                                {

                                    startRow = 2;//如果第一行是标题，第二行列名，则从第二行开始读取

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

                                    {

                                        cell = firstRow.GetCell(i);

                                        if (cell != null)

                                        {

                                            if (cell.StringCellValue != null)

                                            {

                                                column = new DataColumn(cell.StringCellValue);

                                                dataTable.Columns.Add(column);

                                            }

                                        }

                                    }

                                }

                                else

                                {

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

                                    {

                                        column = new DataColumn("column" + (i + 1));

                                        dataTable.Columns.Add(column);

                                    }

                                }

                                //填充行

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

                                {

                                    row = sheet.GetRow(i);

                                    if (row == null) continue;

                                    dataRow = dataTable.NewRow();

                                    for (int j = row.FirstCellNum; j < cellCount; ++j)//dataTable.Columns.Count

                                    {

                                        cell = row.GetCell(j);

                                        if (cell == null)

                                        {

                                            dataRow[j] = "";

                                        }

                                        else

                                        {

                                            //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)

                                            switch (cell.CellType)

                                            {

                                                case CellType.Blank:

                                                    dataRow[j - row.FirstCellNum] = "";

                                                    break;

                                                case CellType.Numeric:

                                                    short format = cell.CellStyle.DataFormat;

                                                    //对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理

                                                    if (format == 14 || format == 31 || format == 57 || format == 58)

                                                        dataRow[j - row.FirstCellNum] = cell.DateCellValue;

                                                    else

                                                        dataRow[j - row.FirstCellNum] = cell.NumericCellValue;

                                                    break;

                                                case CellType.String:

                                                    dataRow[j - row.FirstCellNum] = cell.StringCellValue;

                                                    break;

                                                case CellType.Formula:

                                                    //System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();

                                                    //nfi.NumberDecimalDigits = 2;

                                                    //short format = cell.CellStyle.Format("{0:F2}", Convert.ToDouble(23, 5235);

                                                    dataRow[j - row.FirstCellNum] = ((float)cell.NumericCellValue);

                                                    break;

                                            }

                                        }

                                    }

                                    dataTable.Rows.Add(dataRow);

                                }

                            }

                        }

                    }

                }

                return dataTable;

            }

            catch (Exception ex)

            {

                if (fs != null)

                {

                    fs.Close();

                }

                return null;

            }

        }