Html correct filePath for downloading file from Server - html

Question

I have done the function to save a file to a Folder in Server, **I am now trying to get the file back from Server by using HTML download, but haven't found the way to get the correct filepath yet.
After stored a file in a Folder in Server, saved filePath in DB by using Entity Framework, I retrieved file from DB with filePath = /VisitReportAttachments/1ea2b64e-545d-4c50-ae7d-eefa7178d310.png. But this filePath doesn't work right.
Click here to download
//file.Path = /VisitReportAttachments/1ea2b64e-545d-4c50-ae7d-eefa7178d310.png
I got an error: Failed - No file
Take a look at create FilePath path in SaveFile code in Controller:
private void SaveFile(HttpPostedFileBase file)
{
string serverPath = "\\VisitReportAttachments";
if (file!= null)
{
if (!Directory.Exists(serverPath))
{
Directory.CreateDirectory(serverPath);
}
var fileName = Guid.NewGuid()+ Path.GetExtension(file.FileName);
var path = Path.Combine("\\", new DirectoryInfo(serverPath).Name, fileName);
path = relativePath.Replace(#"\", "/"); //this path is stored to DB
....
//As I mentioned: save file to Server is done. I simply post the code that create the filepath in SQL DB while file is storing to Server*
}
}
FilePath is stored in DB like: /VisitReportAttachments/1ea2b64e-545d-4c50-ae7d-eefa7178d310.png
Need help!

Answer 1

Found out the solution by using Server.MapPath to Map the filePath to the correct Path.
Instead of using downloadable Link in HTML View, I create Download function in Controller:
[HttpPost]
[Authorize]
public ActionResult DownloadAttachment()
{
return Json(true);
}
[HttpGet]
public ActionResult Download(Guid? attachmentId)
{
var visitAttachment = _visitAttachmentService.FindOne(x => x.Id == attachmentId);
try
{
var serverPath = Server.MapPath(visitAttachment.Path);
byte[] fileBytes = System.IO.File.ReadAllBytes(serverPath);
return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, visitAttachment.AttachmentName);
}
catch
{
return File(Encoding.UTF8.GetBytes(""), System.Net.Mime.MediaTypeNames.Application.Octet, visitAttachment.AttachmentName);
}
}
Call this method in View:
#file.AttachmentName
<script>
function Download(attachmentId) {
var url = '/Visits/DownloadAttachment';
$.post(url,
{
// FilePath: filePath
},
function (data) {
var response = JSON.parse(data);
window.location = '/Visits/Download?attachmentId=' + attachmentId;
},
"json");
}
</script>
It works perfectly now.

Answer 2

Your private string SaveFile(HttpPostedFileBase file) method should return a NewFile model object that reflects the entity in your database. private NewFile SaveFile(HttpPostedFileBase file)
public class NewFile
{
public int NewFileId { get; set; }
public string FileName { get; set; }
public string FilePath { get; set; }
}
You will need do something similar to the following code when you save the File:
using (var db = new YourDbContext())
{
var newFile = new NewFile { FileName = fileName, FilePath = path };
var savedFile = db.Add(newFile);
db.SaveChanges();
return savedFile; // here is the object you can return to the view and access
// its properties
}

Answer 3

private string SaveFile(HttpPostedFileBase file)
{
if (file == null)
return string.Empty;
string saveFolder = "VisitReportAttachments";
string fileName = fileName = Guid.NewGuid() + Path.GetExtension(file.FileName);
string serverFolderPath = AppDomain.CurrentDomain.BaseDirectory + "/" + saveFolder;
string savePath = serverFolderPath + "/" + fileName;
if (!Directory.Exists(serverFolderPath))
Directory.CreateDirectory(serverFolderPath);
file.SaveAs(savePath);
return Url.Content($"~/{saveFolder}/{fileName}");
}

Answer 4

You have not shored file in folder.
Add below line in code
file.SaveAs(serverPath + file.FileName);
So your C# code will be like
private string SaveFile(HttpPostedFileBase file)
{
string serverPath = "\\VisitReportAttachments";
if (file!= null)
{
if (!Directory.Exists(serverPath))
{
Directory.CreateDirectory(serverPath);
}
var fileName = Guid.NewGuid()+ Path.GetExtension(file.FileName);
var path = Path.Combine("\\", new DirectoryInfo(serverPath).Name, fileName);
file.SaveAs(serverPath + file.FileName);
path = relativePath.Replace(#"\", "/");
return path;
}
return string.Empty;
}