.Net Core+NPOI快速导入导出Excel

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摘要

Excel导入导出在开发中是非常常见的，对Excel操作，NPOI使用的是最常用的，但单单用NPOI，要写得代码还是比较多的，可以借助一个Npoi.Mapper库，操作起来就非常简单了，十来行代码就可以对Excel和List互相转换，非常简便。

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首先NuGet引入NPOI和Npoi.Mapper

.Net Core+NPOI快速导入导出Excel

增加一个ExcelHelper

 public class ExcelHelper     {         /// <summary>         /// List转Excel         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="list">数据</param>         /// <param name="sheetName">表名</param>         /// <param name="overwrite">true,覆盖单元格，false追加内容(list和创建的excel或excel模板)</param>         /// <param name="xlsx">true-xlsx，false-xls</param>         /// <returns>返回文件</returns>         public static MemoryStream ParseListToExcel<T>(List<T> list, string sheetName = "sheet1", bool overwrite = true, bool xlsx = true) where T : class         {             var mapper = new Mapper();             MemoryStream ms = new MemoryStream();             mapper.Save<T>(ms, list, sheetName, overwrite, xlsx);             return ms;         }         /// <summary>         /// Excel转为List         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="fileStream"></param>         /// <param name="sheetname"></param>         /// <returns></returns>         public static List<T> ParseExcelToList<T>(Stream fileStream, string sheetname = "") where T : class         {             List<T> ModelList = new List<T>();             var mapper = new Mapper(fileStream);             List<RowInfo<T>> DataList = new List<RowInfo<T>>();             if (!string.IsNullOrEmpty(sheetname))             {                 DataList = mapper.Take<T>(sheetname).ToList();             }             else             {                 DataList = mapper.Take<T>().ToList();             }              if (DataList != null && DataList.Count > 0)             {                 foreach (var item in DataList)                 {                     ModelList.Add(item.Value);                 }             }             return ModelList;         }     }

增加一个User Model用作导出，Column指明导出时表头显示的列名

 public class User     {         [Column("用户ID")]         public int UserId { get; set; }         [Column("用户名")]         public string UserName { get; set; }         [Column("手机号")]         public string Phone { get; set; }         [Column("邮箱")]         public string Email { get; set; }     }

增加一个FileController控制器

 public class FileController : Controller     {         public IActionResult Index()         {             return View();         }         [HttpPost]         public IActionResult Upload()         {             //用户List             List<User> users = new List<User>();             //获取到上传的文件             var file = Request.Form.Files[0];             //文件转成流             using (var fileStream = file.OpenReadStream())             {                 //excel转实体                 users = ExcelHelper.ParseExcelToList<User>(fileStream, "Sheet1");             }             return Content(JsonConvert.SerializeObject(users));          }         public IActionResult DownLoad()         {             //生成List             List<User> usrs = new List<User>();             for(int i=1;i<=10;i++)             {                 User user = new User()                 {                     UserId = i,                     UserName = "用户" + i,                     Phone = "13800000000",                     Email = $"user{i}@qq.com"                 };                 usrs.Add(user);             }             //List转为Excel文件             var fileStream = ExcelHelper.ParseListToExcel(usrs);             return File(fileStream.ToArray(), "application/vnd.ms-excel", "用户信息.xlsx");         }     }

Index的视图

@{ } <a href="/File/DownLoad">导出excel文件</a> <form action="/File/Upload" method="post" enctype="multipart/form-data" >   选择excel文件:  <input type="file" name="file" />     <input type="submit" value="上传excel" /> </form>