NOPI导出Excel

 NOPI导出Excel 

 　　　　/// <summary>
         /// 导出的方法 Excel样式
         /// </summary>
         /// <param name="ds"></param>
         /// <returns></returns>
         public static byte[] ExportToExcelMultipleSheet(DataSet ds)
         {
             HSSFWorkbook hssfworkbook;
             hssfworkbook = new HSSFWorkbook();
             ISheet sheet1 = hssfworkbook.CreateSheet(ds.Tables[].TableName);
             List<NPOI.SS.UserModel.ISheet> sheetList = new List<NPOI.SS.UserModel.ISheet>();
             sheetList.Add(sheet1);

             for (int i = ; i < ds.Tables.Count; i++)
             {
                 ISheet sheet = hssfworkbook.CreateSheet(ds.Tables[i].TableName);
                 sheetList.Add(sheet);
             }
             LargeDataExportMultipleSheet(hssfworkbook, sheetList, ds);
             MemoryStream file = new MemoryStream();
             hssfworkbook.Write(file);
             file.Close();
             return file.ToArray();
         }

         /// <summary>
         /// 数据大于65536时使用
         /// </summary>
         /// <param name="dt"></param>
         /// <returns></returns>
         /// <summary>
         /// 数据大于65536时使用
         /// </summary>
         /// <param name="dt"></param>
         /// <returns></returns>
         public static byte[] ExportToExcel(DataTable dt)
         {
             DataColumnCollection str = dt.Columns;
             if (str.Count == ) return null;
             HSSFWorkbook hssfworkbook;
             hssfworkbook = new HSSFWorkbook();
             ISheet sheet1 = hssfworkbook.CreateSheet("Sheet1");
             List<NPOI.SS.UserModel.ISheet> sheetList = new List<NPOI.SS.UserModel.ISheet>();
             sheetList.Add(sheet1);

             int rows = dt.Rows.Count + ;
             int p = rows %  ==  ? rows /  : (rows / ) + ;
             for (int i = ; i < p; i++)
             {
                 ISheet sheet = hssfworkbook.CreateSheet("sheet" + (i + ).ToString());
                 sheetList.Add(sheet);
             }
             LargeDataExport(hssfworkbook, sheetList, dt);
             MemoryStream file = new MemoryStream();
             hssfworkbook.Write(file);
             file.Close();
             return file.ToArray();
         }

         private static void LargeDataExport(NPOI.HSSF.UserModel.HSSFWorkbook hssfworkbook, List<NPOI.SS.UserModel.ISheet> sheetCollection, DataTable dt)
         {
             DataColumnCollection str = dt.Columns;

             for (int i = ; i < sheetCollection.Count; i++)
             {
                 ISheet sheet1 = sheetCollection[i];

                 if (i == )
                 {
                     IRow headerRow = sheet1.CreateRow();
                     for (int m = , len = str.Count; m < len; m++)
                     {
                         ICell curCell = headerRow.CreateCell(m);
                         headerRow.Height =  * ;
                         ICellStyle style = hssfworkbook.CreateCellStyle();
                         style.FillPattern = FillPattern.SolidForeground;
                         style.FillForegroundColor = HSSFColor.Grey25Percent.LightOrange.Index;
                         IFont font = hssfworkbook.CreateFont();
                         font.FontHeightInPoints = ;
                         font.Color = HSSFColor.White.Index; //HSSFColor.WHITE.index;
                         style.SetFont(font);
                         curCell.CellStyle = style;
                         curCell.SetCellValue(str[m].ToString());
                         sheet1.SetColumnWidth(m,  * );
                     }
                 }

                 for (int j = i * ; j < (i + ) * ; j++)
                 {
                     if (j > dt.Rows.Count - )
                         break;
                     IRow row = sheet1.CreateRow(j -  * i + );
                     row.Height =  * ;

                     for (int k = ; k < dt.Columns.Count; k++)
                     {
                         ICell rowCell = row.CreateCell(k);
                         rowCell.SetCellValue(dt.Rows[j][k].ToString());
                     }
                 }
             }
         }

  =====================
113  调用方法： 

 　　    /// <summary>
         /// 将数据导出到Excel中
         /// </summary>
         /// <returns></returns>
         public FileResult TXDebtExportExcel()
         {

          DataTable dt=new DataTable();

         dt =数据源；

   　　　 //创建Excel文件的对象
             NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
             System.IO.MemoryStream ms = new System.IO.MemoryStream();

             NPOIExcelHelper n = new NPOIExcelHelper();

             byte[] fileArr = null;
             try
             {
                 fileArr = NPOIExcelHelper.ExportToExcel(dt);  //括号内的参数为数据源
             }
             catch (Exception ex)
             {
                 tempLog.Info(string.Format("用户:{0} 导出 数据 出现异常：{1}", userRealName, ex.Message));
             }
             string fileName = "数据" + System.DateTime.Now.ToString("yyyyMMddhhssmm");
             tempLog.Info(string.Format("用户:{0}导出数据成功!", userRealName));  //记录日志
             return File(fileArr, "application/vnd.ms-excel", fileName + ".xls");
         }

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