NPOI 获取行数、获取列数

using (FileStream fs =new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
    IWorkbook workbook = new HSSFWorkbook(fs);
    ISheet sheet = workbook.GetSheetAt(0);
    int rowCount = sheet.LastRowNum;
}

       //读取行
                IRow row = sheet.GetRow(i);
                if (row.Cells[0] == null)
                    continue;
                var value = row.Cells[0].ToString();
row.Cells.Capacity