uploading and reading from an excel file in asp.net core 2

Question

previously Asp.Net MVC had this third party library which easily allowed uploading and reading from an excel file called Excel Data Reader. We didn\'t need to have the file

Answer 1

First upload your excel file and read the excel file record using asp.net core 3.1.

using System;
using Microsoft.AspNetCore.Mvc;
using ExcelFileRead.Models;
using Microsoft.AspNetCore.Hosting;
using System.IO;
using OfficeOpenXml;
using System.Linq;

namespace ExcelFileRead.Controllers
 {
 public class HomeController : Controller
  {

    private readonly IHostingEnvironment _hostingEnvironment;
    public HomeController(IHostingEnvironment hostingEnvironment)
    {
        _hostingEnvironment = hostingEnvironment;
    }
    public ActionResult File()
    {
        FileUploadViewModel model = new FileUploadViewModel();
        return View(model);
    }
    [HttpPost]
    public ActionResult File(FileUploadViewModel model)
    {
        string rootFolder = _hostingEnvironment.WebRootPath;
        string fileName = Guid.NewGuid().ToString() + model.XlsFile.FileName;
        FileInfo file = new FileInfo(Path.Combine(rootFolder, fileName));
        using (var stream = new MemoryStream())
        {
            model.XlsFile.CopyToAsync(stream);
            using (var package = new ExcelPackage(stream))
            {
                package.SaveAs(file);
            }
        }

        using (ExcelPackage package = new ExcelPackage(file))
        {
            ExcelWorksheet worksheet = package.Workbook.Worksheets.FirstOrDefault();
            if (worksheet == null)
            {

                //return or alert message here
            }
            else
            {

                var rowCount = worksheet.Dimension.Rows;
                for (int row = 2; row <= rowCount; row++)
                {
                    model.StaffInfoViewModel.StaffList.Add(new StaffInfoViewModel
                    {
                        FirstName = (worksheet.Cells[row, 1].Value ?? string.Empty).ToString().Trim(),
                        LastName = (worksheet.Cells[row, 2].Value ?? string.Empty).ToString().Trim(),
                        Email = (worksheet.Cells[row, 3].Value ?? string.Empty).ToString().Trim(),
                    });
                }
                
            }
        }
        return View(model);
    }

  }
}

For more details(step by step)

https://findandsolve.com/articles/how-to-read-column-value-from-excel-in-aspnet-core-or-best-way-to-read-write-excel-file-in-dotnet-core