使用NPOI随意创建Excel(含下拉列表)

   //创建工作簿
             HSSFWorkbook ssfworkbook = new HSSFWorkbook();
             //创建工作表(页)
             HSSFSheet sheet1 = ssfworkbook.CreateSheet("Sheet1");
             //创建一行
             HSSFRow headerRow = (HSSFRow)sheet1.CreateRow();
             //设置表头
             headerRow.CreateCell().SetCellValue("ID");
             //设置表头的宽度
             sheet1.SetColumnWidth(,  * );
 #region     添加显示下拉列表
             HSSFSheet sheet2 = ssfworkbook.CreateSheet("ShtDictionary");
             ssfworkbook.SetSheetHidden(, true);//隐藏
             sheet2.CreateRow().CreateCell().SetCellValue("itemA");//列数据
             sheet2.CreateRow().CreateCell().SetCellValue("itemB");
             sheet2.CreateRow().CreateCell().SetCellValue("itemC");
             HSSFName range = ssfworkbook.CreateName();//创建名称
             range.Reference = "ShtDictionary!$A$1:$A$3";//格式
             range.NameName = "dicRange";
             #endregion
 headerRow.CreateCell().SetCellValue("Selected");
             sheet1.SetColumnWidth(,  * );
             //将下拉列表添加
             CellRangeAddressList regions = new CellRangeAddressList(, , , );
             DVConstraint constraint = DVConstraint.CreateFormulaListConstraint("dicRange");
             HSSFDataValidation dataValidate = new HSSFDataValidation(regions, constraint);
             sheet1.AddValidationData(dataValidate);

             headerRow.CreateCell().SetCellValue("VALUE");
             sheet1.SetColumnWidth(,  * );

             //写入数据
             //创建数据行
             HSSFRow dataRow = (HSSFRow)sheet1.CreateRow();
             //填充数据
             dataRow.CreateCell().SetCellValue("");//id
             dataRow.CreateCell().SetCellValue("");//选择框
             dataRow.CreateCell().SetCellValue("值");//选择框
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
             ssfworkbook.Write(ms);
             string filename = "Sheet1" + DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + ".xls";
             Response.AddHeader("Content-Disposition", string.Format("attachment; filename=" + filename + ""));
             Response.BinaryWrite(ms.ToArray());
             ms.Close();
             ms.Dispose();