================* Introduction *================This PRoject is the .NET port of POI project at http://poi.apache.org/. POI is an open source java project which can help you read/write xls, doc, PPT files. It has a wide application. For example, you can use it a to generate a Excel report without Microsoft Office suite installed on your server and more efficient than call Microsoft Excel ActiveX at background; you can also use it to extract text from Office documents to help you implement full-text indexing feature (most of time this feature is used to create search engines).==================* NPOI Website *==================https://github.com/tonyqus/npoi/ (Latest source code available)http://npoi.googlecode.com (No latest source code available)http://npoi.codeplex.com (No latest source code available)http://tonyqus.sinaapp.com (Official Tutorial in Chinese)======================* System Requirement *======================VS2010 with .NET 2.0 or .NET 4.0VS2005 or VS2008 with .NET 2.0 Runtime (SP1) vs2003 with .NET 1.1 medium trust environment in asp.net
using System;using System.Data;using System.IO;using NPOI.HSSF.UserModel;using NPOI.SS.UserModel;using NPOI.XSSF.UserModel;namespace MyNameSpace{ public static class NPOIHelper { /// <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 Tuple<string, DataTable> ImportExcelToDataTable(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(0);//第一行 int cellCount = firstRow.LastCellNum;//列数 //构建datatable的列 if (isColumnName) { startRow = 1;//如果第一行是列名，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) { 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] = ""; 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] = cell.DateCellValue; else dataRow[j] = cell.NumericCellValue; break; case CellType.String: dataRow[j] = cell.StringCellValue; break; } } } dataTable.Rows.Add(dataRow); } } } } } return Tuple.Create<string, DataTable>("", dataTable); } catch (Exception ex) { if (fs != null) { fs.Close(); } return Tuple.Create<string, DataTable>(ex.Message, null); } } public static Tuple<bool, string> ExportDataTableToExcel(DataTable dt, string saveTopath) { bool result = false; string message = ""; 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(); sheet = workbook.CreateSheet("Sheet0");//创建一个名称为Sheet0的表 int rowCount = dt.Rows.Count;//行数 int columnCount = dt.Columns.Count;//列数 //设置列头 row = sheet.CreateRow(0);//excel第一行设为列头 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 + 1); for (int j = 0; j < columnCount; j++) { cell = row.CreateCell(j);//excel第二行开始写入数据 cell.SetCellValue(dt.Rows[i][j].ToString()); } } using (fs = File.OpenWrite(saveTopath)) { workbook.Write(fs);//向打开的这个xls文件中写入数据 result = true; } } else { message = "没有解析到数据！"; } return new Tuple<bool, string>(result, message); } catch (Exception ex) { if (fs != null) { fs.Close(); } return new Tuple<bool, string>(false, ex.Message); } } }}
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