NPOI将xls文件解析为DataTable类数据

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Data;
using System.Windows.Forms;

using NPOI.SS.UserModel;
using NPOI.HSSF.Util;
using NPOI.HSSF.UserModel;
using NPOI.XSSF.UserModel;  

namespace ExcelDataExtractor
{
    static class TableDataParser
    {
        static IWorkbook hssfworkbook;
        static public DataTable ImportExcelFile(string filePath)
        {
            #region//初始化信息
            try
            {
                using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                {
                    hssfworkbook = new HSSFWorkbook(file);
                }
            }
            catch (Exception e)
            {
                MessageBox.Show("error："+e.Message+"\n");
                return (DataTable)null;
            }
            #endregion  

            ISheet sheet = hssfworkbook.GetSheetAt();
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            DataTable dt = new DataTable();
            //一行最后一个方格的编号 即总的列数
            for (int j = ; j < (sheet.GetRow().LastCellNum); j++)
            {
                dt.Columns.Add(Convert.ToChar(((int)'A') + j).ToString());
            }
            while (rows.MoveNext())
            {
                IRow row = (HSSFRow)rows.Current;
                DataRow dr = dt.NewRow();
                for (int i = ; i < row.LastCellNum; i++)
                {
                    ICell cell = row.GetCell(i);
                    if (cell == null)
                    {
                        dr[i] = null;
                    }
                    else
                    {
                        dr[i] = cell.ToString();
                    }
                }
                dt.Rows.Add(dr);
            }
            return dt;
        }
    }
}