using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System;
using System.IO;namespace NPOI.WriteExcel
{class Program{/*NPOI.DLL：NPOI 核心函式庫。NPOI.DDF.DLL：NPOI 繪圖區讀寫函式庫。NPOI.HPSF.DLL：NPOI 文件摘要資訊讀寫函式庫。NPOI.HSSF.DLL：NPOI Excel BIFF 檔案讀寫函式庫。NPOI.Util.DLL：NPOI 工具函式庫。NPOI.POIFS.DLL：NPOI OLE 格式存取函式庫。ICSharpCode.SharpZipLib.DLL：檔案壓縮函式庫。*/static void Main(string[] args){new Program().CreateExcel();new Program().InsertContext();}/// <summary>/// 创建Excel/// </summary>private void CreateExcel(){HSSFWorkbook workbook = new HSSFWorkbook();FileStream filestream = new FileStream(AppDomain.CurrentDomain.BaseDirectory+DateTime.Now.ToString("yyyyMMddHHmmss")+".xls",FileMode.Create);// 新增試算表。 workbook.CreateSheet("試算表 A");workbook.CreateSheet("試算表 B");workbook.CreateSheet("試算表 C");workbook.Write(filestream);workbook.Close();filestream.Close();filestream.Dispose();}/// <summary>/// 像Excel中添加内容/// </summary>private void InsertContext(){HSSFWorkbook workbook = new HSSFWorkbook();FileStream filestream = new FileStream(AppDomain.CurrentDomain.BaseDirectory + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls", FileMode.Create);// 新增試算表。 ISheet sheet1 = workbook.CreateSheet("試算表 A");ISheet sheet2 = workbook.CreateSheet("試算表 B");ISheet sheet3 = workbook.CreateSheet("試算表 C");//依次创建行和列for (int i = 0; i < 10; i++){IRow row1 = sheet1.CreateRow(i);IRow row2 = sheet2.CreateRow(i);IRow row3 = sheet3.CreateRow(i);for (int j = 0; j < 10; j++){ICell cell1 = row1.CreateCell(j);cell1.SetCellValue("第" + (i + 1) + "行，第" + (j + 1) + "列");ICell cell2 = row2.CreateCell(j);cell2.SetCellValue("第" + (i + 1) + "行，第" + (j + 1) + "列");ICell cell3 = row3.CreateCell(j);cell3.SetCellValue("第" + (i + 1) + "行，第" + (j + 1) + "列");}}workbook.Write(filestream);workbook.Close();filestream.Close();filestream.Dispose();}}
}

  HSSFWorkbook workbook = new HSSFWorkbook();FileStream filestream = new FileStream(AppDomain.CurrentDomain.BaseDirectory + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls", FileMode.Create);// 新增試算表。 ISheet sheet1 = workbook.CreateSheet("試算表 A");ISheet sheet2 = workbook.CreateSheet("試算表 B");ISheet sheet3 = workbook.CreateSheet("試算表 C");//创建表头  IRow rowHead = sheet1.CreateRow(0);rowHead.CreateCell(0).SetCellValue("序号");sheet1.SetColumnWidth(0, 256 * 15);rowHead.CreateCell(1).SetCellValue("QQ");sheet1.SetColumnWidth(1, 256 * 25);rowHead.CreateCell(2).SetCellValue("名称");sheet1.SetColumnWidth(2, 256 * 20);rowHead.CreateCell(3).SetCellValue("时间");sheet1.SetColumnWidth(3, 256 * 15);//依次填充值string beginTime = this.dateTimePicker1.Value.ToString().Split(' ')[0];string endTime = this.dateTimePicker2.Value.ToString();pagesize = Convert.ToInt32(this.label4.Text);DataSet ds = bll.GetList("", beginTime, endTime, Inum, pagesize, out allCount);for (int i = 0; i < ds.Tables[0].Rows.Count; i++){//创建第二行，并赋值IRow rowHead2 = sheet1.CreateRow(i+1);rowHead2.CreateCell(0).SetCellValue(ds.Tables[0].Rows[i][0].ToString());rowHead2.CreateCell(1).SetCellValue(ds.Tables[0].Rows[i][1].ToString());rowHead2.CreateCell(2).SetCellValue(ds.Tables[0].Rows[i][2].ToString());rowHead2.CreateCell(3).SetCellValue(ds.Tables[0].Rows[i][3].ToString());}workbook.Write(filestream);workbook.Close();filestream.Close();filestream.Dispose();