public class XlsxController : Controller
 {
  private IHostingEnvironment _hostingEnvironment;

  public XlsxController(IHostingEnvironment hostingEnvironment)
  {
   _hostingEnvironment = hostingEnvironment;
  }
  public IActionResult Index()
  {
   return View();
  }

  public IActionResult Export()
  {
   string sWebRootFolder = _hostingEnvironment.WebRootPath;
   string sFileName = $"{Guid.NewGuid()}.xlsx";
   FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
   using (ExcelPackage package = new ExcelPackage(file))
   {
    // 添加worksheet
    ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("aspnetcore");
    //添加头
    worksheet.Cells[1, 1].Value = "ID";
    worksheet.Cells[1, 2].Value = "Name";
    worksheet.Cells[1, 3].Value = "Url";
    //添加值
    worksheet.Cells["A2"].Value = 1000;
    worksheet.Cells["B2"].Value = "LineZero";
    worksheet.Cells["C2"].Value = "http://www.cnblogs.com/linezero/";

    worksheet.Cells["A3"].Value = 1001;
    worksheet.Cells["B3"].Value = "LineZero GitHub";
    worksheet.Cells["C3"].Value = "https://github.com/linezero";
    worksheet.Cells["C3"].Style.Font.Bold = true;

    package.Save(); 
   }
   return File(sFileName, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
  }
 }

@{ 
}
<h2>ASP.NET Core 导入导出Excel xlsx 文件</h2>
<a asp-action="Export">导出Excel</a>

@{ 
}
<h2>ASP.NET Core 导入导出Excel xlsx 文件</h2>
<a asp-action="Export">导出Excel</a>
<hr />
<form enctype="multipart/form-data" method="post" asp-action="Import">
 <input type="file" name="excelfile" />
 <input type="submit" value="上传" />
</form>

 [HttpPost]
  public IActionResult Import(IFormFile excelfile)
  {
   string sWebRootFolder = _hostingEnvironment.WebRootPath;
   string sFileName = $"{Guid.NewGuid()}.xlsx";
   FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
   try
   {
    using (FileStream fs = new FileStream(file.ToString(), FileMode.Create))
    {
     excelfile.CopyTo(fs);
     fs.Flush();
    }
    using (ExcelPackage package = new ExcelPackage(file))
    {
     StringBuilder sb = new StringBuilder();
     ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
     int rowCount = worksheet.Dimension.Rows;
     int ColCount = worksheet.Dimension.Columns;
     bool bHeaderRow = true;
     for (int row = 1; row <= rowCount; row++)
     {
      for (int col = 1; col <= ColCount; col++)
      {
       if (bHeaderRow)
       {
        sb.Append(worksheet.Cells[row, col].Value.ToString() + "\t");
       }
       else
       {
        sb.Append(worksheet.Cells[row, col].Value.ToString() + "\t");
       }
      }
      sb.Append(Environment.NewLine);
     }
     return Content(sb.ToString());
    }
   }
   catch (Exception ex)
   {
    return Content(ex.Message);
   }
  }