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POStoring and Retrieving files in a DB the right way with MVC 3
 

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    <p>I have a simple feedback form that allows my users to log feedback and optionally upload files related to the problem. The files can be of any format, not just images.</p> <p>The server side code on the controller looks like this:</p> <pre><code> [HttpPost] public ActionResult Create(Entry entry) { try { foreach (string inputTagName in Request.Files) { HttpPostedFileBase file = Request.Files[inputTagName]; if (file != null &amp;&amp; file.ContentLength &gt; 0) { using (MemoryStream ms = new MemoryStream()) { file.InputStream.CopyTo(ms); db.Files.Add(new Models.File { Entry = entry, FileName = Path.GetFileName(file.FileName), FileContents = ms.GetBuffer() }); } } } entry.Status = Status.Open; entry.Severity = Severity.Medium; entry.DateSubmitted = DateTime.Now; db.Entries.Add(entry); db.SaveChanges(); return View("Complete"); } catch { return View("Error"); } } </code></pre> <p>I also have a controller action that lets me download the entire database into a zip and send it to my browser:</p> <pre><code> public ActionResult Download() { MemoryStream fileStream = new MemoryStream(); StringBuilder csv = new StringBuilder(); csv.AppendLine("Id,Summary,Description,Company,Name,Email,Telephone,Version,Area,Date Submitted,Notes,Resolution,Date Resolved"); using (ZipFile zip = new ZipFile()) { foreach (Entry entry in db.Entries.ToList()) { csv.AppendFormat("{0},{1},{2},{3},{4},{5},{6},{7},{8},{9},{10},{11},{12}", entry.Id, entry.Summary, entry.Description, entry.Company.Name, entry.Name, entry.Email, entry.Telephone, entry.Version.Number, entry.Area, entry.DateSubmitted, entry.Notes, entry.Resolution, entry.DateResolved); if (entry.Files.Count &gt; 0) { foreach (FeedbackManager.Models.File file in entry.Files) { using (MemoryStream ms = new MemoryStream()) { ms.Write(file.FileContents, 0, file.FileContents.Length); ms.Flush(); zip.AddEntry(entry.Id+"_"+file.FileName, ms.GetBuffer()); } } } } zip.AddEntry("feedback.csv", csv.ToString()); zip.Save(fileStream); } return File(fileStream.GetBuffer(), "application/zip", String.Format("FeedbackToDate_{0}.zip", DateTime.Now.Date.ToShortDateString())); } </code></pre> <p>The problem im having is reading the file data back out of the database, the zip file is getting corrupted some how and im not able to open it, if I exclude the files, I can open the zip file and I can read the csv fine.</p> <p>Whats the correct way of pulling these files back out of the DB, do I need to save to the file system first? Is the file data getting corrupted some how? How do I perserve the raw binary data so the content is unaffected?</p> <p>Thanks</p>
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