How to cancel and delete the uploading file in asp.net mvc 3? - asp.net

Question

I am using a filestream to receive a large file in my controller. codes below:
[HttpPost]
public JsonResult Create(string qqfile, Attachment attachment)
{
Stream inputStream = HttpContext.Request.InputStream;
string fullName = ingestPath + Path.GetFileName(qqfile);
using (var fs = new FileStream(fullName, FileMode.Append, FileAccess.Write))
{
try
{
var buffer = new byte[1024];
int l = inputStream.Read(buffer, 0, 1024);
while (l > 0)
{
fs.Write(buffer, 0, l);
l = inputStream.Read(buffer, 0, 1024);
}
return Json(new {success = "true"});
}
catch (Exception)
{
return Json(new {success = "false"});
}
finally
{
inputStream.Flush();
inputStream.Close();
fs.Flush();
fs.Close();
}
}
}
And in my page ajax method, I add a button to cancel the file uploading and delete the unfinished file from disk. The ajax request to the action named "Cancel":
[HttpPost]
public JsonResult Cancel(string filename)
{
string localName = HttpUtility.UrlDecode(filename);
string fullName = ingestPath + Path.GetFileName(localName);
if (System.IO.File.Exists(fullName))
{
System.IO.File.Delete(fullName);
}
return Json(new {cancle = true});
}
The problem is: the file can not delete, and the exception message is
the process cannot access the file 'e:\tempdata\filename_xxx.xxx'because it is being used by another process.
I think it is because that ,the filestream of this file is not closed. How can I close this filestream and delete the file in my 'Cancel' action?
--
OH! I found a method to resolve it now.
using (var fs = new FileStream(fullName, FileMode.Append, FileAccess.Write))
It is to simple, just declaration a fileshare property: FileShare.Delete
using (var fs = new FileStream(fullName, FileMode.Append, FileAccess.Write, FileShare.Delete))
I spent 4 hours to google and debug and test and try to resolve it. Just 10 mins after I asked stackoverflow, I got the answer by myself. Interesting! And hope it is useful to someone too.

Answer 1

You could put that file stream in a session then use that session in your cancel action to close the stream.