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

问题

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 on the local disk, which was great because my application needs to run on Azure.

However we are now porting this functionality to asp.net core 2, and it seems from searching that this is not possible. Does anybody know any libraries that would allow me to do this? Please note, I am not looking for solutions that read from a disk. I want to upload an excel file and read data from the stream directly.

回答1:

Latest versions of ExcelDataReader support netstandard2.0, thus work with ASP.NET Core 2. It also targets netstandard1.3, so works with ASP.NET Core 1.x as well.

(not sure what you searched that said it is not possible, but that is clearly wrong)

回答2:

I Could Read Excel File In 'Asp .Net Core' By This Code.

Import And Export Data Using EPPlus.Core.

    [HttpPost]
    public IActionResult ReadExcelFileAsync(IFormFile file)
    {
        if (file == null || file.Length == 0)
            return Content("File Not Selected");

        string fileExtension = Path.GetExtension(file.FileName);

        if (fileExtension == ".xls" || fileExtension == ".xlsx")
        {
            var rootFolder = @"D:\Files";
            var fileName = file.FileName;
            var filePath = Path.Combine(rootFolder, fileName);
            var fileLocation = new FileInfo(filePath);

          using (var fileStream = new FileStream(filePath, FileMode.Create))
            {
                await file.CopyToAsync(fileStream);
            }

            if (file.Length <= 0)
                return BadRequest(GlobalValidationMessage.FileNotFound);  

          using (ExcelPackage package = new ExcelPackage(fileLocation))
          {
          ExcelWorksheet workSheet = package.Workbook.Worksheets["Table1"];
          //var workSheet = package.Workbook.Worksheets.First();
          int totalRows = workSheet.Dimension.Rows;

          var DataList = new List<Customers>();

          for (int i = 2; i <= totalRows; i++)
           {
                  DataList.Add(new Customers
                    {
                   CustomerName = workSheet.Cells[i, 1].Value.ToString(),
                   CustomerEmail = workSheet.Cells[i, 2].Value.ToString(),
                   CustomerCountry = workSheet.Cells[i, 3].Value.ToString()
                   });
           }

                _db.Customers.AddRange(customerList);
                _db.SaveChanges();
            }
        }

        return Ok();
}

来源：https://stackoverflow.com/questions/49658913/uploading-and-reading-from-an-excel-file-in-asp-net-core-2