[源碼分享]NPOI讀取Excel到 dataTable

            const string fileName = "d:\aa.xlsx";  //路徑
            FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate); //讀取文件流
            HSSFWorkbook workbook = new HSSFWorkbook(fs);  //根據EXCEL文件流初始化工作簿
            var sheet1= workbook.GetSheetAt(0); //獲取第一個sheet
            DataTable table = new DataTable();//
            var row1 = sheet1.GetRow(0);//獲取第一行即標頭
            int cellCount = row1.LastCellNum; //第一行的列數
            //把第一行的數據添加到datatable的列名
            for (int i = row1.FirstCellNum; i < cellCount; i++)
            {
                DataColumn column = new DataColumn(row1.GetCell(i).StringCellValue);
                table.Columns.Add(column);
            }

            int rowCount = sheet1.LastRowNum; //總行數

            //把每行數據添加到datatable中
            for (int i = (sheet1.FirstRowNum + 1); i < sheet1.LastRowNum; i++)
            {
                HSSFRow row = sheet1.GetRow(i);
                DataRow dataRow = table.NewRow();

                for (int j = row.FirstCellNum; j < cellCount; j++)
                {
                    if (row.GetCell(j) != null)
                        dataRow[j] = row.GetCell(j).ToString();
                }

                table.Rows.Add(dataRow);
            }
//到這裏 table 已經可以用來做數據源使用了
            workbook = null; //清空工作簿--釋放資源
            sheet1 = null;  //清空sheet