使用NPOI读取Excel里的数据

DataTable dt = new DataTable();
using (FileStream file = new FileStream(@"C:\Users\Administrator\Desktop\导入datatable\导入datatable\OK.xlsx", FileMode.Open, FileAccess.Read))
{
	XSSFWorkbook hssfworkbook = new XSSFWorkbook(file);
	NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0);
	var row1 = sheet.GetRow(0);//获取第一行即标头 
	int cellCount = row1.LastCellNum;//第一行的列数 
	//把第一行的数据添加到datatable的列名 
	for (int i = row1.FirstCellNum; i < cellCount; i++)
	{
		DataColumn column = new DataColumn(row1.GetCell(i).StringCellValue);
		dt.Columns.Add(column); 
	}
	int row = sheet.LastRowNum;
	for (int i = sheet.FirstRowNum+1; i <= sheet.LastRowNum; i++)
	{
		IRow row2 = sheet.GetRow(i);
		DataRow datarow = dt.NewRow();
		for (int j = row2.FirstCellNum; j < cellCount; j++)
		{
			if (row2.GetCell(j)!=null)
			{
				datarow[j] = row2.GetCell(j);
			}
		}
		dt.Rows.Add(datarow);
	}
}