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;
}
}
}

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