How to get text of .dat files of the zip files which are available in sub folder of one zip file in asp.net core 6.0?

Question

my IFormFile zip file contains multiple folders which again contains zip files which contains.dat types files, so need to read this.dat file's text data.

I tried like below

[HttpPost]
    public async Task<IActionResult> RequestFiles()
    {
        try
        {
            IFormFile file = Request.Form.Files[0];
            Stream stream = file.OpenReadStream();
            using (ZipArchive archive = new ZipArchive(stream, ZipArchiveMode.Read))
            {
                foreach (var entry in archive.Entries)
                {
                    if (entry.Name.ToLower().Contains(".zip"))
                    {
                        MemoryStream nestedArchiveStream = new MemoryStream();

                        entry.Open().CopyTo(nestedArchiveStream);
                        
                        using (var nestedArchive = new ZipArchive(nestedArchiveStream))
                        {
                            var datFile = nestedArchive.Entries[0];

                            StreamReader reader = new StreamReader(datFile.ToString());
                            string strAllFile = reader.ReadToEnd();
                        }
                    }
                }
            }
            return Ok();
        }
        catch (Exception ex)
        {
            return BadRequest(ex.Message);
        }
    }

Error: Could not find file 'D:\project'spath\WPNN788_4_11-15-22_084023.dat'.

Answer 1

Just because the codes datFile.ToString() returns the relative path.

However,the constructor of StreamReader requires the full path

And the error indicates:If you pass a relative path into the constructor,it would treate the path like:

var fullpath = Path.Combine(System.Environment.CurrentDirectory, relativepath);

You could try to pass the stream instead of the path into the constructor:

StreamReader reader = new StreamReader(datFile.Open());

I debugged and the result: