Cannot delete uploaded file after saving to disk

Question

Using C# and .net 4.8 I have an API method where users upload a file.

I save the file to a temp directory, do some processing, then save it to the final destination directory.

At the end of the process I want to delete the file from the temp directory, but I get an exception:

The process cannot access the file because it is being used by another process.

on this line:

File.Delete(originalTmpPath);

To narrow down the problem I have remmed out all code that does additional processing so now my code does only 3 things:

1. Save the file to the temp directory.
2. Save the file “In the temp directory” to another directory.
3. Delete the first file

Here’ the code in the API:

HttpResponseMessage result = null;
var httpRequest = HttpContext.Current.Request;

var file = httpRequest.Files[0];
// Save image to temp folder
file.SaveAs(originalTmpPath);

// Save image to final folder
Bitmap bmp = new Bitmap(System.Drawing.Image.FromFile(originalTmpPath));
bmp.Save(originalPath);

//Exception here:
File.Delete(originalTmpPath);

Any idea how I can stop the process/unlock the file and delete it?

Thank you

Answer 1

use InputStream in file if you are not manipulating the file.

Bitmap bmp = new Bitmap(file.InputStream);
bmp.Save(originalPath);

then

File.Delete(originalTmpPath);

Of course, saving the file to the server is useless.

or use

using(Bitmap bmp = new Bitmap(originalTmpPath))
{
    bmp.Save(originalPath);
}
File.Delete(originalTmpPath);