起风网生成EXCEL文件是经常需要用到的功能，我们利用一些开源库可以很容易实现这个功能。
方法一：利用excellibrary，http://code.google.com/p/excellibrary/
excellibrary是国人写的开源组件，很容易使用，可惜貌似还不支持.xlsx(Excel 2007)，例子如下：
//Create the data set and tableDataSet ds = new DataSet("New_DataSet");DataTable dt = new DataTable("New_DataTable");//Set the locale for eachds.Locale = System.Threading.Thread.CurrentThread.CurrentCulture;dt.Locale = System.Threading.Thread.CurrentThread.CurrentCulture;//Open a DB connection (in this example with OleDB)OleDbConnection con = new OleDbConnection(dbConnectionString);con.Open();//Create a query and fill the data table with the data from the DBstring sql = "SELECT Whatever FROM MyDBTable;";OleDbCommand cmd = new OleDbCommand(sql, con);OleDbDataAdapter adptr = new OleDbDataAdapter();adptr.SelectCommand = cmd;adptr.Fill(dt);con.Close();//Add the table to the data setds.Tables.Add(dt);//Here's the easy part. Create the Excel worksheet from the data setExcelLibrary.DataSetHelper.CreateWorkbook("MyExcelFile.xls", ds);
例子二：
//create new xls filestring file = "C:\\newdoc.xls";Workbook workbook = new Workbook();Worksheet worksheet = new Worksheet("First Sheet");worksheet.Cells[0, 1] = new Cell((short)1);worksheet.Cells[2, 0] = new Cell(9999999);worksheet.Cells[3, 3] = new Cell((decimal)3.45);worksheet.Cells[2, 2] = new Cell("Text string");worksheet.Cells[2, 4] = new Cell("Second string");worksheet.Cells[4, 0] = new Cell(32764.5, "#,##0.00");worksheet.Cells[5, 1] = new Cell(DateTime.Now, @"YYYY\-MM\-DD");worksheet.Cells.ColumnWidth[0, 1] = 3000;workbook.Worksheets.Add(worksheet);workbook.Save(file);// open xls fileWorkbook book = Workbook.Load(file);Worksheet sheet = book.Worksheets[0];// traverse cellsforeach (Pair<Pair<int, int>, Cell> cell in sheet.Cells){dgvCells[cell.Left.Right, cell.Left.Left].Value = cell.Right.Value;}// traverse rows by Indexfor (int rowIndex = sheet.Cells.FirstRowIndex;rowIndex <= sheet.Cells.LastRowIndex; rowIndex++){Row row = sheet.Cells.GetRow(rowIndex);for (int colIndex = row.FirstColIndex;colIndex <= row.LastColIndex; colIndex++){Cell cell = row.GetCell(colIndex);}}
方法二：利用EPPlus,http://epplus.codeplex.com/
EPPlus是一个使用Open Office XML(xlsx)文件格式，能读写Excel 2007/2010 文件的开源组件。
例子如下：
var file = @"Sample.xlsx";if (File.Exists(file)) File.Delete(file);using (var excel = new ExcelPackage(new FileInfo(file))){var ws = excel.Workbook.Worksheets.Add("Sheet1");ws.Cells[1, 1].Value = "Date";ws.Cells[1, 2].Value = "Price";ws.Cells[1, 3].Value = "Volume";var random = new Random();for (int i = 0; i < 10; i++){ws.Cells[i + 2, 1].Value = DateTime.Today.AddDays(i);ws.Cells[i + 2, 2].Value = random.NextDouble() * 1e3;ws.Cells[i + 2, 3].Value = random.Next() / 1e3;} ws.Cells[2, 1, 11, 1].Style.Numberformat.Format = "dd/MM/yyyy";ws.Cells[2, 2, 11, 2].Style.Numberformat.Format = "#,##0.000000"; ws.Cells[2, 3, 11, 3].Style.Numberformat.Format = "#,##0";ws.Column(1).AutoFit();ws.Column(2).AutoFit();ws.Column(3).AutoFit();excel.Save();}
例子二：
using OfficeOpenXml;//指定Templete文档Text.xlsxFileInfo newFile = new FileInfo("D:" + @"\Test.xlsx");//开启using (ExcelPackage pck = new ExcelPackage(newFile)){try{//设定ExcelWorkBookExcelWorkbook workBook = pck.Workbook;if (workBook != null){if (workBook.Worksheets.Count > 0){//复制Temp这个Sheet同时命名为《清单》ExcelWorksheet currentWorksheet = workBook.Worksheets.Copy("Temp", "清单");//可以设定保护Sheet的密码//currentWorksheet.Protection.SetPassword("1234");int StartRow = 4;for (int i = 0; i < tDS.Tables[0].Rows.Count; i++){//Cells[RowIndex,CellIndex]currentWorksheet.Cells[StartRow + i, 1].Value = Convert.ToString(tDS.Tables[0].Rows[i][0]);currentWorksheet.Cells[StartRow + i, 2].Value = Convert.ToString(tDS.Tables[0].Rows[i][1]);currentWorksheet.Cells[StartRow + i, 3].Value = Convert.ToString(tDS.Tables[0].Rows[i][2]);currentWorksheet.Cells[StartRow + i, 4].Value = Convert.ToString(tDS.Tables[0].Rows[i][3]);currentWorksheet.Cells[StartRow + i, 5].Value = Convert.ToString(tDS.Tables[0].Rows[i][4]);currentWorksheet.Cells[StartRow + i, 6].Value = Convert.ToString(tDS.Tables[0].Rows[i][5]);currentWorksheet.Cells[StartRow + i, 7].Value = Convert.ToString(tDS.Tables[0].Rows[i][6]);currentWorksheet.Cells[StartRow + i, 8].Value = Convert.ToString(tDS.Tables[0].Rows[i][7]);currentWorksheet.Cells[StartRow + i, 9].Value = Convert.ToString(tDS.Tables[0].Rows[i][8]);currentWorksheet.Cells[StartRow + i, 10].Value = Convert.ToString(tDS.Tables[0].Rows[i][9]);currentWorksheet.Cells[StartRow + i, 11].Value = Convert.ToString(tDS.Tables[0].Rows[i][10]);currentWorksheet.Cells[StartRow + i, 12].Value = Convert.ToString(tDS.Tables[0].Rows[i][11]);currentWorksheet.Cells[StartRow + i, 13].Value = Convert.ToString(tDS.Tables[0].Rows[i][12]);}//将Temp 这个Sheet删除workBook.Worksheets.Delete("Temp");}}//存至Text4.xlsxpck.SaveAs(new FileInfo("H:" + @"\Test4.xlsx"));}catch (Exception e){oLogger.Fatal(e.ToString());}}
方法三：NPOI http://npoi.codeplex.com/
NPOI无需Office COM组件且不依赖Office，使用NPOI能够帮助开发者在没有安装微软Office的情况下读写Office 97-2003的文件，支持的文件格式包括xls, doc, ppt等。NPOI是构建在POI 3.x版本之上的，它可以在没有安装Office的情况下对Word/Excel文档进行读写操作。
被人称为操作EXCEL的终极方案，例子如下：
//引用using NPOI.HSSF.UserModel;using NPOI.HPSF;using NPOI.POIFS.FileSystem;using NPOI.SS.UserModel;//将WorkBook指到我们原本设计好的Templete Book1.xlsusing (IWorkbook wb = new HSSFWorkbook(new FileStream("D:/Book1.xls", FileMode.Open))){try{//设定要使用的Sheet为第0个SheetISheet TempSheet = wb.GetSheetAt(0);int StartRow = 4;//tDS为Query回来的资料for (int i = 0; i < tDS.Tables[0].Rows.Count; i++){//第一个Row要用Create的TempSheet.CreateRow(StartRow + i).CreateCell(0).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][0]));//第二个Row之后直接用Get的TempSheet.GetRow(StartRow + i).CreateCell(1).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][1]));TempSheet.GetRow(StartRow + i).CreateCell(2).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][2]));TempSheet.GetRow(StartRow + i).CreateCell(3).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][3]));TempSheet.GetRow(StartRow + i).CreateCell(4).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][4]));TempSheet.GetRow(StartRow + i).CreateCell(5).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][5]));TempSheet.GetRow(StartRow + i).CreateCell(6).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][6]));TempSheet.GetRow(StartRow + i).CreateCell(7).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][7]));TempSheet.GetRow(StartRow + i).CreateCell(8).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][8]));TempSheet.GetRow(StartRow + i).CreateCell(9).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][9]));TempSheet.GetRow(StartRow + i).CreateCell(10).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][10]));TempSheet.GetRow(StartRow + i).CreateCell(11).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][11]));TempSheet.GetRow(StartRow + i).CreateCell(12).SetCellValue(Convert.ToString(tDS.Tables[0].Rows[i][12]));}//将文档写到指定位置using (FileStream file = new FileStream("H:/Test_NPOI4.xls", FileMode.Create)){wb.Write(file);file.Close();file.Dispose();}}catch (Exception e){string a = e.ToString();}}
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