Excel文件的导出操作

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System.Data;
using YTO.WeiXin.Model;

namespace YTO.WeiXin.Core
{
    public class ExcelToDB
    {
        public HSSFWorkbook hssfworkbook;
        //将excel文件转换成list
        public IList<ContactInfo> ExcelToList(string path)
        {
            IList<ContactInfo> list = new List<ContactInfo>();
            try
            {
                using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read))
                {
                    hssfworkbook = new HSSFWorkbook(file);
                    HSSFSheet sheet = hssfworkbook.GetSheetAt(0) as HSSFSheet;
                    for (int i = 0; i <= sheet.LastRowNum; i++)
                    {
                        HSSFRow row = sheet.GetRow(i) as HSSFRow;
                        ContactInfo contactInfo = new ContactInfo();
                        contactInfo.Id = Guid.NewGuid().ToString();
                        if (row.GetCell(0) != null)
                        {
                            row.GetCell(0).SetCellType(CellType.STRING);
                            contactInfo.CenterName = row.GetCell(0).StringCellValue.ToString();
                        }
                        else
                        {
                            contactInfo.CenterName = "";
                        }
                        if (row.GetCell(0) != null)
                        {
                            row.GetCell(1).SetCellType(CellType.STRING);
                            contactInfo.Name = row.GetCell(1).StringCellValue.ToString();
                        }
                        else
                        {
                            contactInfo.Name = "";
                        }
                        if (row.GetCell(2) != null)
                        {
                            row.GetCell(2).SetCellType(CellType.STRING);
                            contactInfo.PhoneNumber = row.GetCell(2).StringCellValue.ToString();
                        }
                        else
                        {
                            contactInfo.PhoneNumber = "";
                        }
                        if (row.GetCell(3) != null)
                        {
                            row.GetCell(3).SetCellType(CellType.STRING);
                            contactInfo.Address = row.GetCell(3).StringCellValue.ToString();
                        }
                        else
                        {
                            contactInfo.Address = "";
                        }
                        list.Add(contactInfo);
                    }
                }
                return list;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        //中心联系方式导出
        public MemoryStream ExportToExcel(string fileName, IList<ContactInfo> list)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            Sheet sheet1 = workbook.CreateSheet("Sheet1");
            sheet1.SetColumnWidth(0, 24 * 256);
            sheet1.SetColumnWidth(1, 16 * 256);
            sheet1.SetColumnWidth(2, 16 * 256);
            sheet1.SetColumnWidth(3, 46 * 256);
            Row row = sheet1.CreateRow(0);
            row.HeightInPoints = 16;
            row.CreateCell(0).SetCellValue("中心名称");
            row.CreateCell(1).SetCellValue("联系人");
            row.CreateCell(2).SetCellValue("联系方式");
            row.CreateCell(3).SetCellValue("地址");
            CellStyle style = workbook.CreateCellStyle();
            style.Alignment = HorizontalAlignment.CENTER;
            style.WrapText = true;
            Font font = workbook.CreateFont();
            font.FontHeightInPoints = 12;
            font.Boldweight = (short)FontBoldWeight.BOLD;
            font.Color = (short)FontColor.RED;
            style.SetFont(font);
            for (int i = 0; i < 4; i++)
            {
                row.GetCell(i).CellStyle = style;
            }

            for (int i = 1; i < list.Count; i++)
            {
                row = sheet1.CreateRow(i);
                row.CreateCell(0).SetCellValue(list[i - 1].CenterName);
                row.CreateCell(1).SetCellValue(list[i - 1].Name);
                row.CreateCell(2).SetCellValue(list[i - 1].PhoneNumber);
                row.CreateCell(3).SetCellValue(list[i - 1].Address);
            }
            MemoryStream ms = new MemoryStream();
            workbook.Write(ms);
            ms.Flush();
            ms.Position = 0;
            return ms;
        }
       
        //异常信息导出
        public MemoryStream ExportExcptionToExcel(string fileName, IList<ExcptionInfo> list)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            Sheet sheet1 = workbook.CreateSheet("Sheet1");
            sheet1.SetColumnWidth(0, 12 * 256);
            sheet1.SetColumnWidth(1, 20 * 256);
            sheet1.SetColumnWidth(2, 16 * 256);
            sheet1.SetColumnWidth(3, 36 * 256);
            sheet1.SetColumnWidth(4, 16 * 256);
            sheet1.SetColumnWidth(5, 40 * 256);
            sheet1.SetColumnWidth(6, 20 * 256);
            Row row = sheet1.CreateRow(0);
            row.HeightInPoints = 16;
            row.CreateCell(0).SetCellValue("车牌号");
            row.CreateCell(1).SetCellValue("线路");
            row.CreateCell(2).SetCellValue("手机号");
            row.CreateCell(3).SetCellValue("异常情况");
            row.CreateCell(4).SetCellValue("异常类型");
            row.CreateCell(5).SetCellValue("位置");
            row.CreateCell(6).SetCellValue("上报时间");
            CellStyle style = workbook.CreateCellStyle();
            style.Alignment = HorizontalAlignment.CENTER;
            style.WrapText = true;
            Font font = workbook.CreateFont();
            font.FontHeightInPoints = 12;
            font.Boldweight = (short)FontBoldWeight.BOLD;
            font.Color = (short)FontColor.RED;
            style.SetFont(font);
            for (int i = 0; i < 7; i++)
            {
                row.GetCell(i).CellStyle = style;
            }
            for (int i = 1; i < list.Count; i++)
            {
                row = sheet1.CreateRow(i);
                row.CreateCell(0).SetCellValue(list[i].LiencePlateNumber);
                row.CreateCell(1).SetCellValue(list[i].CarLine);
                row.CreateCell(2).SetCellValue(list[i].PhoneNumber);
                row.CreateCell(3).SetCellValue(list[i].Remark);
                row.CreateCell(4).SetCellValue(list[i].ExcptionCategory);
                row.CreateCell(5).SetCellValue(list[i].Position);
                row.CreateCell(6).SetCellValue(list[i].CreateTime.ToString());
            }
            MemoryStream ms = new MemoryStream();
            workbook.Write(ms);
            ms.Flush();
            ms.Position = 0;
            return ms;
        }
    }
}