在c#中使用epplus读取受密码保护的excel

Question

I am downloading the excel file with password using epplus library. The downloading part is working fine.

public ActionResult DownloadExcel()
{

string sFileName = string.Empty;

using (ExcelPackage package = projectBL.DownloadExcel(ID, id1, id3, id4, id5))
   {
     System.Net.Mime.ContentDisposition cd = new System.Net.Mime.ContentDisposition
        {
            FileName = package.File.Name,
        };

        Response.Headers.Add("Content-Disposition", cd.ToString());

        return File(package.GetAsByteArray("password"), "application/vndopenxmlformats-officedocument.spreadsheetml.sheet");

    }
}

But whenever I am trying to upload this password protected file it is giving me below error

The file is not an valid Package file. If the file is encrypted, please supply the password in the constructor.

So, I have resolved the above error my providing the required password to read the file. Below is the code for the same.

public ActionResult UploadExcel()
{
  if (Request.Form.Files != null && Request.Form.Files.Count > 0)
   {
     var fileObject = Request.Form.Files[0];

     string fileName = ContentDispositionHeaderValue.Parse(fileObject.ContentDisposition).FileName.Trim('"');

     var Stream = fileObject.OpenReadStream();

     ExcelPackage package = new ExcelPackage(Stream,"password");

     projectBL.SaveData(package);

     return Json("Records Saved Succesfully.");
    }
}

However, after providing the password still I am not able to read/upload the excel file due to below error

The stream must be read/write

So my question is how can i read the password protected file using Stream. I am using this code in web api.

Any help on this appreciated !

Answer 1

Is it a XLS or XLSX file? EPplus cannot works with XLS files.

Here how I simply do with EPPLUS :

using (ExcelPackage xlPackage = new ExcelPackage(new FileInfo(fileName), "password"))
{}

Answer 2

When I tried to upload excel file and it shown the code error for "The file is not an valid Package file. If the file is encrypted, please supply the password in the constructor".

But my excel file was not encrypted and also was not password protected.

I find out a solution by using try catch like I just opened my excel file and then try to save that file from .xls to .xlsx format.

After doing this, file upload was successful and EPPlus dll did not give any error and working well!