asp.net DataTable导出 excel的方法记录（第三方）

官网：http://npoi.codeplex.com/

简单应用，主要是可以实现我们想要的简单效果，呵呵

需要引入dll，可以在官网下载，也可在下面下载

C#代码


protected void getExcel(DataTable dt)

{

NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();

NPOI.SS.UserModel.Sheet sheet = book.CreateSheet("test_01");

NPOI.SS.UserModel.Row row = sheet.CreateRow(0);

for (int i = 0; i < dt.Columns.Count; i++)

{

row.CreateCell(i).SetCellValue(dt.Columns[i].ColumnName);

}

for (int i = 0; i < dt.Rows.Count; i++)

{

NPOI.SS.UserModel.Row row2 = sheet.CreateRow(i + 1);

for (int j = 0; j < dt.Columns.Count; j++)

row2.CreateCell(j).SetCellValue(dt.Rows[i][j].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=EmptyWorkbook.xls"));

Response.BinaryWrite(ms.ToArray());

book = null;

ms.Close();

ms.Dispose();

}



EXCEL导入

C#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

这样就可以读取一个EXCEL的文件了返回一个Datatable