注意：此文档中标注的行号和列号都是下标，从0开始
//下载模板
protected void btnDownLoad_ServerClick（object sender,EventArgs e）
{
//生成Excel模板
CreateExcelTemp();
//设置想要打开的模板路径
string path = this.MapPath("~/BaseInfo/Temp/GABProdectInfoMaintain.xls");
//将此模板打开或重新保存
ExcelOutE(this, path);
}
/// 生成Excel模板并打开
/// </summary>
private void CreateExcelTemp()
{
//获取数据库中的产品组信息列表
List<ProductGroupModel> ProductGroupInfo = ProductGroupBusiness.GetUserAllProductGroup(CurrentUserCode);
List<string> ProductGroupList = new List<string>();
//将产品信息列表中是产品组名称和编号组合成一列，加入ProductGroupList集合
foreach (ProductGroupModel item in ProductGroupInfo)
{
ProductGroupList.Add(item.Name + "(" + item.ProductGroupCode + ")");
}
//创建Excel模板(在模板上修改)
//创建模板
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
ISheet realSheet = hssfworkbook.CreateSheet("realSheet");
ISheet hidden = hssfworkbook.CreateSheet("hidden");
设置hssfworkbook中下标为一的sheet隐藏
hssfworkbook.SetSheetHidden(1, true);
//循环ProductGroupList集合，将所有数据加入hidden中的第0列
//注意：在别的sheet中第几列需要引用hidden中的数据，就应该将数据源中的数据插入到hidden中的第几列，列编号必须相同
for (int i = 0; i < ProductGroupList.Count; i++)
{
HSSFRow rowtemp = (HSSFRow)hidden.CreateRow(i);
ICell celltemp = rowtemp.CreateCell(0);//将数据库查到到hidden中的第0列
celltemp.SetCellValue(ProductGroupList[i].ToString());
}
//设置hidden中的一些属性
IName namedCell = hssfworkbook.CreateName();
namedCell.NameName="hidden";
namedCell.RefersToFormula = "hidden!A1:A" + ProductGroupList.ToArray().Length;
//将hidden中的数据加入到constraint里面
DVConstraint constraint = DVConstraint.CreateFormulaListConstraint("hidden");
CellRangeAddressList addressList = null;
HSSFDataValidation validation = null;
//给realSheet创建行和列
IRow row0 = realSheet.CreateRow(0);
row0.CreateCell(0).SetCellValue("GAB其他产品信息维护");
IRow row1 = realSheet.CreateRow(1);
row1.CreateCell(0).SetCellValue("产品组");
row1.CreateCell(1).SetCellValue("产品名称");
row1.CreateCell(2).SetCellValue("产品价格");
//设置realSheet中列的宽度
realSheet.SetColumnWidth(0, 8000);
realSheet.SetColumnWidth(1, 5000);
realSheet.SetColumnWidth(2, 5000);
//填充信息
DataTable dt = A_GABCustomerRelationBusiness.GetGABProductInfo();
if (dt != null || dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
//在realSheet的第2行第0列开始引用hidden中的数据
addressList = new CellRangeAddressList(i+2, i+2, 0, 0);
validation = new HSSFDataValidation(addressList, constraint);
realSheet.AddValidationData(validation);
HSSFRow rowtemp = (HSSFRow)realSheet.CreateRow(i + 2);
ICell celltemp = rowtemp.CreateCell(0);
celltemp.SetCellValue(dt.Rows[i]["ProductGroupName"].ToString());
ICell celltemp1 = rowtemp.CreateCell(1);
celltemp1.SetCellValue(dt.Rows[i]["ProductName"].ToString());
ICell celltemp2 = rowtemp.CreateCell(2);
celltemp2.SetCellValue(dt.Rows[i]["ProductPrice"].ToString());
}
}
#endregion
//保存修改的模板
string savePath = this.MapPath("~/BaseInfo/Temp/GABProdectInfoMaintain.xls");
using (FileStream file = new FileStream(savePath, FileMode.Create))
{
//写入文件到savePath路径下
hssfworkbook.Write(file);
}
}
//将fileName文件打开或重新保存
public static void ExcelOutE(Page Page, string fileName)
{
HttpResponse Response = Page.Response;
HttpServerUtility Server = Page.Server;
string fn = Server.UrlDecode(fileName);
FileStream fileStream = new FileStream(fn, FileMode.Open);
long fileSize = fileStream.Length;
fileStream.Close();
Response.Clear();
Response.Buffer = true;
Response.Charset = "GB2312";
Response.AppendHeader("Content-Disposition", "attachment;filename=Sheet1.xls");
Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
Response.ContentType = "application/ms-excel";
Response.AddHeader("Content-Length", fileSize.ToString());
Page.EnableViewState = false;
Response.WriteFile(fn);
Response.Flush();
Response.End();
}
导出带下拉框的Excel（数据超出长度解决方案）