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

 1   HSSFWorkbook hssfworkbook = new HSSFWorkbook();
 2   ISheet sheet = hssfworkbook.CreateSheet("我的第一个sheet");
 3   IRow rowheader = sheet.CreateRow(0);
 4   rowheader.CreateCell(0, CellType.STRING).SetCellValue("我爱你中国");
 5   IRow row1 = sheet.CreateRow(1);
 6   row1.CreateCell(1, CellType.STRING).SetCellValue("012345678901230");
 7   using (Stream stream = File.OpenWrite(path))
 8   {
 9       hssfworkbook.Write(stream);
10   }

笨拙的读取Excel

 1 using (Stream stream = File.OpenRead(path))
 2 {
 3     HSSFWorkbook hssfworkbook = new HSSFWorkbook(stream);
 4     ISheet sheet = hssfworkbook.GetSheetAt(0);
 5     IRow rowherder = sheet.GetRow(0);
 6     DataTable dt = new DataTable();
 7     foreach (ICell cell in rowherder)
 8     {
 9         dt.Columns.Add(cell.ToString());
10     }
11     for (int i = sheet.FirstRowNum + 1; i < sheet.LastRowNum; i++)
12     {
13         IRow row = sheet.GetRow(i);
14         DataRow dr = dt.NewRow();
15         for (int j = 0; j < row.LastCellNum; j++)
16         {
17             dr[j] = row.GetCell(j).ToString();
18         }
19         dt.Rows.Add(dr);
20     }
21     //Console.WriteLine("读取的excel到DataTable dt");
22 }