使用NPOI组件读取excel数据

分享一段代码，将excel数据读取到DataTable:

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

namespace ConsoleApp.Utility
{
    public class ExcelBuilder
    {
        /// <summary>
        /// exact excel data into DataTable
        /// </summary>
        /// <param name="excel">excel file name</param>
        /// <param name="index">sheet index </param>
        /// <param name="header"> the first row in excel whether belongs the columns</param>
        /// <returns>DataTable</returns>
        public static DataTable ToDataTable(string excel,int index, bool header)
        {
            DataTable dt = new DataTable(Path.GetFileNameWithoutExtension(excel) + "_Sheet" + index);
            IWorkbook workbook;
            using (FileStream file = new FileStream(excel, FileMode.Open, FileAccess.Read))
            {
                workbook = new XSSFWorkbook(file);
            }
            ISheet sheet = workbook.GetSheetAt(index);
            var rows = sheet.GetRowEnumerator();

            rows.MoveNext();
            IRow row = (XSSFRow)rows.Current;
            
            for (int i = 0; i < row.LastCellNum; i++)
            {
                ICell cell = row.GetCell(i);
                string columnName = header ? cell.StringCellValue : i.ToString();
                dt.Columns.Add(columnName, typeof(string));
            }
            if (!header)
            {
                DataRow first = dt.NewRow();
                for (int i = 0; i < row.LastCellNum; i++)
                {
                    ICell cell = row.GetCell(i);
                    first[i] = cell.StringCellValue;
                }
                dt.Rows.Add(first);
            }
           
            while (rows.MoveNext())
            {
                row = (XSSFRow)rows.Current;
                DataRow dataRow = dt.NewRow();
               
                for (int i = 0; i < row.LastCellNum; i++)
                {
                    ICell cell = row.GetCell(i);
                    dataRow[i] = cell.StringCellValue;
                }
                dt.Rows.Add(dataRow);
            }
            
            return dt;
        }
    }
}