NPOI 利用DataTable导出Excel 2003和2007

NPOI插件官网：http://npoi.codeplex.com

引用插件

具体代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using NPOI.XSSF.UserModel;//导出2007
using NPOI.HSSF.UserModel;//导出2003
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.HPSF;
using System.Data;
using System.Web;

namespace MES.Common
{
    public class ExcelExportHelper
    {
        public static void Export2003(DataTable dt, string filePath)
        {
            NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
            NPOI.SS.UserModel.ISheet sheet = book.CreateSheet(dt.TableName);

            NPOI.SS.UserModel.IRow row = sheet.CreateRow(0);
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                row.CreateCell(i).SetCellValue(dt.Columns[i].ColumnName);
            }
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                NPOI.SS.UserModel.IRow row2 = sheet.CreateRow(i + 1);
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    row2.CreateCell(j).SetCellValue(Convert.ToString(dt.Rows[i][j]));
                }
            }
            // 写入到客户端  
            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
            {
                book.Write(ms);
                using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
                {
                    byte[] data = ms.ToArray();
                    fs.Write(data, 0, data.Length);
                    fs.Flush();
                }
                book = null;
            }

        }

        public static void Export2007(DataTable dt, string filePath)
        {
            XSSFWorkbook book = new XSSFWorkbook();
            ISheet sheet1 = book.CreateSheet("data");
            IRow dataRow = sheet1.CreateRow(0);
            foreach (DataColumn column in dt.Columns)
            {
                dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
            }
            //填充内容
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                dataRow = sheet1.CreateRow(i + 1);
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    dataRow.CreateCell(j).SetCellValue(dt.Rows[i][j].ToString());
                }
            }
            // 写入到客户端  
            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
            {
                book.Write(ms);
                using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
                {
                    byte[] data = ms.ToArray();
                    fs.Write(data, 0, data.Length);
                    fs.Flush();
                }
                book = null;
            }
        }
    }
}