读写Excle,不用office环境

1.下载NPOI.dll,并添加引用

2.ExcelHelper帮助类,以下为读写的参照方法

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HSSFWorkbook hssfworkbook;  #region  导入Excel 返回Table public DataTable ImportExcelFile(string filePath) {     #region//初始化信息     try     {         using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))         {             hssfworkbook = new HSSFWorkbook(file);         }     }     catch (Exception e)     {         throw e;     }     #endregion       NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0);     System.Collections.IEnumerator rows = sheet.GetRowEnumerator();     DataTable dt = new DataTable();     for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)     {         dt.Columns.Add(Convert.ToChar(((int)'A') + j).ToString());     }     while (rows.MoveNext())     {         HSSFRow row = (HSSFRow)rows.Current;         DataRow dr = dt.NewRow();         for (int i = 0; i < row.LastCellNum; i++)         {             NPOI.SS.UserModel.ICell cell = row.GetCell(i);             if (cell == null)             {                 dr[i] = null;             }             else             {                 dr[i] = cell.ToString();             }         }         dt.Rows.Add(dr);     }     return dt; } #endregion   #region 导出excel //Datatable导出Excel public   MemoryStream  GridToExcelByNPOI(DataTable dt) {     try     {         HSSFWorkbook workbook = new HSSFWorkbook();         ISheet sheet = workbook.CreateSheet("Sheet1");           ICellStyle HeadercellStyle = workbook.CreateCellStyle();         HeadercellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;         HeadercellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;         HeadercellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;         HeadercellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;         HeadercellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;         //字体         NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont();         headerfont.Boldweight = (short)FontBoldWeight.Bold;         HeadercellStyle.SetFont(headerfont);             //用column name 作为列名         int icolIndex = 0;         IRow headerRow = sheet.CreateRow(0);         foreach (DataColumn item in dt.Columns)         {             ICell cell = headerRow.CreateCell(icolIndex);             cell.SetCellValue(item.ColumnName);             cell.CellStyle = HeadercellStyle;             icolIndex++;         }           ICellStyle cellStyle = workbook.CreateCellStyle();           //为避免日期格式被Excel自动替换，所以设定 format 为 『@』 表示一率当成text來看         cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("@");         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;             NPOI.SS.UserModel.IFont cellfont = workbook.CreateFont();         cellfont.Boldweight = (short)FontBoldWeight.Normal;         cellStyle.SetFont(cellfont);           //建立内容行         int iRowIndex = 1;         int iCellIndex = 0;         foreach (DataRow Rowitem in dt.Rows)         {             IRow DataRow = sheet.CreateRow(iRowIndex);             foreach (DataColumn Colitem in dt.Columns)             {                   ICell cell = DataRow.CreateCell(iCellIndex);                 cell.SetCellValue(Rowitem[Colitem].ToString());                 cell.CellStyle = cellStyle;                 iCellIndex++;             }             iCellIndex = 0;             iRowIndex++;         }           //自适应列宽度         for (int i = 0; i < icolIndex; i++)         {             sheet.AutoSizeColumn(i);         }           //写Excel         MemoryStream  ms = new MemoryStream ();         workbook.Write(ms);         ms.Flush();         ms.Position = 0;           return ms;     }     catch (Exception ex)     {         throw ex;     } } #endregion