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");