标签：mem 操作 excel user wro ret except response use
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。
导出代码：
NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("test_01");
// 第一列
NPOI.SS.UserModel.IRow row = sheet.CreateRow(0);
row.CreateCell(0).SetCellValue("第一列第一行");
// 第二列
NPOI.SS.UserModel.IRow row2 = sheet.CreateRow(1);
row2.CreateCell(0).SetCellValue("第二列第一行");
// ...
// 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();
导入代码：
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();
for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)
{
dt.Columns.Add(Convert.ToChar(((int)‘A‘) + j).ToString());
}
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
这样就很简单的解决Excel的操作了，大家可以试试，很好用。
转自：https://www.cnblogs.com/joean/p/4406463.html
标签：mem 操作 excel user wro ret except response use
原文地址：https://www.cnblogs.com/shiyi2014/p/12356772.html
