利用 NUget包 EPPlus 实现数据导出到Excel（适用于MVC）

第一步:为项目安装Epplus Nuget包。

Install-Package EPPlus 

第二步：在data项目中新建Repository，命名为ExcelWriter.cs.

将以下代码粘入，修改项目引用名字。

using System;
using OfficeOpenXml;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;

namespace ****.Data.Repositories
{
    public class ExcelWriter<TEntity>  where TEntity :class 
    {
        public void WriteToFileStream(IEnumerable<TEntity> list, out MemoryStream memoryStream)
        {
            var pack = new ExcelPackage();
            var ws = pack.Workbook.Worksheets.Add("预约时间表");

            var col = 1;
            var row = 1;
            foreach (var propertyInfo in typeof(TEntity).GetProperties())
            {
                var displayName = propertyInfo.Name;
                ws.Cells[row, col].Value = displayName;
                col++;
            }

            row++;

            foreach (var coachBatchPayoutExcelModel in list)
            {

                for (var i = 1; i < col; i++)
                {
                    var colName = ws.Cells[1, i].Value.ToString();
                    ws.Cells[row, i].Value = coachBatchPayoutExcelModel.GetType().GetProperty(colName).GetValue(coachBatchPayoutExcelModel, null);
                }
                row++;
            }

            foreach (var propertyInfo in typeof(TEntity).GetProperties())
            {
                var attribute = propertyInfo.GetCustomAttributes(typeof(DisplayNameAttribute), true).Cast<DisplayNameAttribute>().SingleOrDefault();
                if (attribute != null)
                {
                    ws.Cells.First(item => item.GetValue<string>() == propertyInfo.Name).Value = attribute.DisplayName;
                }
            } 
            ws.Column(6).Style.Numberformat.Format = "yyyy年MM月dd日";
            ws.Column(1).Width = 20;
            ws.Column(2).Width = 15;
            ws.Column(3).Width = 20;
            ws.Column(4).Width = 25;
            ws.Column(5).Width = 6;
            ws.Column(6).Width = 15;
            memoryStream = new MemoryStream(pack.GetAsByteArray());
        }
    }
}

以上为一泛型，如何使用请参考以下使用样例。

  #region 下载数据

            Mapper.CreateMap<OnlineBookingInfo, ExcelModel>();
            var excels = Mapper.Map<List<OnlineBookingInfo>, List<ExcelModel>>(onlineBookingInfos);

            MemoryStream memoryStream;
            var excelWriter = new ExcelWriter<ExcelModel>();
            excelWriter.WriteToFileStream(excels, out memoryStream);
            return File(memoryStream, "application/vnd.ms-excel", "郑州科技馆预约参观名单" + DateTime.Now.Date.ToString("yyyy_MM_dd") + ".xls");
  #endregion

先将需要导出的数据使用mapper，映射到新的实体类型（只需要导出的实体，此处的可以为新建）

excel的title为新建实体的dispalyname的名字。

使用的时候先

MemoryStream memoryStream;

var excelWriter = new ExcelWriter<ExcelModel>();

然后

excelWriter.WriteToFileStream(excels, out memoryStream);

最后输出

return File(memoryStream, "application/vnd.ms-excel", "郑州科技馆预约参观名单" + DateTime.Now.Date.ToString("yyyy_MM_dd") + ".xls");