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HSSFWorkbook workbook = new HSSFWorkbook();//XLS格式
ISheet sheet = workbook.CreateSheet();
IRow row = sheet.CreateRow(0);//从第一行开始写
row.CreateCell(1, CellType.Numeric).SetCellValue(3.14);
using (FileStream stream = new FileStream(@"C:\test1.xls", FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
workbook.Write(stream);
Dispose();
}