Asp.net操作Excel（终极方法NPOI）(转)
先去官网：http://npoi.codeplex.com/下载需要引入dll（可以选择.net2.0或者.net4.0的dll），然后在网站中添加引用。
另：https://files.cnblogs.com/zhongxinWang/NPOI.rar
一：将数据导出到excel
List<>作为数据源
//创建Excel文件的对象
NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
//添加一个sheet
NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("降雨量日报表");
//获取list数据
List<ST_RainInfo_Day> listRainInfo = ST_RainInfo_Day_Helper.ObjectList(dtBeginDate, dtEndDate);
//给sheet1添加第一行的头部标题
NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
row1.CreateCell(0).SetCellValue("站名");
row1.CreateCell(1).SetCellValue("河名");
row1.CreateCell(2).SetCellValue("地址");
row1.CreateCell(3).SetCellValue("日雨量");
row1.CreateCell(4).SetCellValue("时间");
row1.CreateCell(5).SetCellValue("天气");
//将数据逐步写入sheet1各个行
for (int i = 0; i < listRainInfo.Count; i++)
{
NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);
rowtemp.CreateCell(0).SetCellValue(listRainInfo[i].STNM.ToString());
rowtemp.CreateCell(1).SetCellValue(listRainInfo[i].RVNM.ToString());
rowtemp.CreateCell(2).SetCellValue(listRainInfo[i].STLC.ToString());
rowtemp.CreateCell(3).SetCellValue(listRainInfo[i].DYP.ToString());
rowtemp.CreateCell(4).SetCellValue(listRainInfo[i].TM.ToString());
//用GetWether方法进行数据转换
rowtemp.CreateCell(5).SetCellValue(GetWether(listRainInfo[i].WTH.ToString()));
}
// 写入到客户端
System.IO.MemoryStream ms = new System.IO.MemoryStream();
book.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
Response.BinaryWrite(ms.ToArray());
book = null;
ms.Close();
ms.Dispose();
DataTable作为数据源
DataTable dt = GetData();
NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("特征值报表");//雨情
NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
row1.CreateCell(0).SetCellValue("站号");
row1.CreateCell(1).SetCellValue("站名");
row1.CreateCell(2).SetCellValue("平均降雨(mm)");
row1.CreateCell(3).SetCellValue("总降雨量(mm)");
row1.CreateCell(4).SetCellValue("最大测站降雨(mm)");
row1.CreateCell(5).SetCellValue("最小测站降雨(mm)");
for (int i = 0; i < dt.Rows.Count; i++)
{
NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);
rowtemp.CreateCell(0).SetCellValue(dt.Rows[i]["STCD"].ToString());
rowtemp.CreateCell(1).SetCellValue(dt.Rows[i]["STNM"].ToString());
rowtemp.CreateCell(2).SetCellValue(dt.Rows[i]["AvgDYP"].ToString());
rowtemp.CreateCell(3).SetCellValue(dt.Rows[i]["SumDYP"].ToString());
rowtemp.CreateCell(4).SetCellValue(dt.Rows[i]["MaxDYP"].ToString());
rowtemp.CreateCell(5).SetCellValue(dt.Rows[i]["MinDYP"].ToString());
}
// 写入到客户端
System.IO.MemoryStream ms = new System.IO.MemoryStream();
book.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
Response.BinaryWrite(ms.ToArray());
book = null;
ms.Close();
ms.Dispose();
二：从Excel中导入数据到
可先将excel文件上传到服务器的临时位置，获取filePath，然后再行读取、导入。
HSSFWorkbook hssfworkbook;
#region
public DataTable ImportExcelFile(string filePath)
{
#region//初始化信息
try
{
using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
}
catch (Exception e)
{
throw e;
}
#endregion
NPOI.SS.UserModel.Sheet sheet = hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
DataTable dt = new DataTable(); //给DdataTable添加表头
for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)
{
dt.Columns.Add(Convert.ToChar(((int)'A') + j).ToString());
} //读取数据
while (rows.MoveNext())
{
HSSFRow row = (HSSFRow)rows.Current;
DataRow dr = dt.NewRow();
for (int i = 0; i < row.LastCellNum; i++)
{
NPOI.SS.UserModel.Cell cell = row.GetCell(i);
if (cell == null)
{
dr[i] = null;
}
else
{
dr[i] = cell.ToString();
}
}
dt.Rows.Add(dr);
}
return dt;
}
#endregion
三：大于65535条记录
//创建Excel文件的对象
NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
//添加一个sheet
NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("sheet1");
//sheet列表,防止记录条数大于65535
List<NPOI.SS.UserModel.ISheet> sheetList = new List<NPOI.SS.UserModel.ISheet>();
sheetList.Add(sheet1);
//给sheet1添加数据
SheetFirst(sheet1, book, datalist);
//给其他sheet添加数据 从1开始：去掉第一个sheet +2是有表头和标题的那2行
int rows = datalist.Count + 2;
int p = rows % 65535 == 0 ? rows / 65535 : (rows / 65535) + 1;
for (int i = 1; i < p; i++)
{
NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("sheet" + (i + 1).ToString());
//为sheet添加数据
SheetElse(sheet, (i - 1) * 65535 + 65533, datalist);
}
// 写入到客户端
System.IO.MemoryStream ms = new System.IO.MemoryStream();
book.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
Response.BinaryWrite(ms.ToArray());
book = null;
ms.Close();
ms.Dispose();
//第一个Sheet
protected void SheetFirst(NPOI.SS.UserModel.ISheet sheet1, NPOI.HSSF.UserModel.HSSFWorkbook book, List<ST_WaterLevel_GradualMonth> datalist)
{
//标题
NPOI.SS.UserModel.ICell cellTitle = sheet1.CreateRow(0).CreateCell(0);
cellTitle.SetCellValue("水位月报表--" + drpCategory.SelectedItem.Text);
//设置标题行样式
NPOI.SS.UserModel.ICellStyle style = book.CreateCellStyle();
style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER;
NPOI.SS.UserModel.IFont font = book.CreateFont();
font.FontHeight = 20 * 20;
style.SetFont(font);
cellTitle.CellStyle = style;
//合并标题行
sheet1.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 9));
//给sheet1添加第一行的头部标题
NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(1);
row1.CreateCell(0).SetCellValue("序号");
row1.CreateCell(1).SetCellValue("测站编码");
row1.CreateCell(2).SetCellValue("测站名称");
row1.CreateCell(3).SetCellValue("河流名称");
row1.CreateCell(4).SetCellValue("日期");
row1.CreateCell(5).SetCellValue("平均水位");
row1.CreateCell(6).SetCellValue("八点水位");
row1.CreateCell(7).SetCellValue("零点水位");
//将数据逐步写入sheet1各个行
for (int i = 0; i < datalist.Count; i++)
{
NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 2);
rowtemp.CreateCell(0).SetCellValue(datalist[i].Row.ToString());
rowtemp.CreateCell(1).SetCellValue(datalist[i].STCD.ToString());
rowtemp.CreateCell(2).SetCellValue(datalist[i].STNM.ToString());
rowtemp.CreateCell(3).SetCellValue(datalist[i].RVNM.ToString());
rowtemp.CreateCell(4).SetCellValue(datalist[i].TM.ToString());
rowtemp.CreateCell(5).SetCellValue(datalist[i].AvgLevel.ToString());
rowtemp.CreateCell(6).SetCellValue(datalist[i].EightLevel.ToString());
rowtemp.CreateCell(7).SetCellValue(datalist[i].ZeroLevel.ToString());
}
}
//其他sheet
protected void SheetElse(NPOI.SS.UserModel.ISheet sheet, int j, List<ST_WaterLevel_GradualMonth> datalist)
{
//将数据逐步写入sheet1各个行
for (int i = 0; j + i < datalist.Count; i++)
{
NPOI.SS.UserModel.IRow rowtemp = sheet.CreateRow(i);
rowtemp.CreateCell(0).SetCellValue(datalist[j + i].Row.ToString());
rowtemp.CreateCell(1).SetCellValue(datalist[j + i].STCD.ToString());
rowtemp.CreateCell(2).SetCellValue(datalist[j + i].STNM.ToString());
rowtemp.CreateCell(3).SetCellValue(datalist[j + i].RVNM.ToString());
rowtemp.CreateCell(4).SetCellValue(datalist[j + i].TM.ToString());
rowtemp.CreateCell(5).SetCellValue(datalist[j + i].AvgLevel.ToString());
rowtemp.CreateCell(6).SetCellValue(datalist[j + i].ZeroLevel.ToString());
}
}
转自http://www.cnblogs.com/zhongxinWang/archive/2012/08/07/2627476.html
