NPOI简单读写Excel

在这里只是简单记录一下NPOI的一个最基本的简单用法，以作备忘。

写入Excel

  HSSFWorkbook hssfworkbook = new HSSFWorkbook();
  ISheet sheet = hssfworkbook.CreateSheet("我的第一个sheet");
  IRow rowheader = sheet.CreateRow(0);
  rowheader.CreateCell(0, CellType.STRING).SetCellValue("我爱你中国");
  IRow row1 = sheet.CreateRow(1);
  row1.CreateCell(1, CellType.STRING).SetCellValue("012345678901230");
  using (Stream stream = File.OpenWrite(path))
  {
      hssfworkbook.Write(stream);
  }        

笨拙的读取Excel

using (Stream stream = File.OpenRead(path))
{
    HSSFWorkbook hssfworkbook = new HSSFWorkbook(stream);
    ISheet sheet = hssfworkbook.GetSheetAt(0);
    IRow rowherder = sheet.GetRow(0);
    DataTable dt = new DataTable();
    foreach (ICell cell in rowherder)
    {
        dt.Columns.Add(cell.ToString());
    }
    for (int i = sheet.FirstRowNum + 1; i < sheet.LastRowNum; i++)
    {
        IRow row = sheet.GetRow(i);
        DataRow dr = dt.NewRow();
        for (int j = 0; j < row.LastCellNum; j++)
        {
            dr[j] = row.GetCell(j).ToString();
        }
        dt.Rows.Add(dr);
    }
    //Console.WriteLine("读取的excel到DataTable dt");
}