File Not Released After Thumbnail Created

[Jeff S]

In an ASP.NET Web application, I enable users to upload a file for use in a
photo album. After uploading the file, some code executes (see it below)
that creates a thumbnail image from the original. The problem is that the
original is not released; when other code tries to delete it (using
File.Delete), an Exception is thrown: "The process cannot access the file...
because it is being used by another process". I get the same error when
trying to delete the same file via Windows Explorer. If I upload multiple
files (each of which gets a thumbnail generated automatically by the code
below), then only the *last* file uploaded cannot be deleted. Note: the
thumbnail file can be deleted - the problem is with the original image which
remains somehow "in use".

What's keeping the originally uploaded file "in use"? What can I do to
release control of the file?

try {
string strFilename = pathToFullSizeImage;
int dotPlace = strFilename.LastIndexOf(".");
string fileType = strFilename.Substring((dotPlace + 1),
(strFilename.Length - (dotPlace + 1))).ToUpper();

int iWidth = 90;
int iHeight = 90;

System.Drawing.Image objThumbnail =
System.Drawing.Image.FromFile(strFilename).GetThumbnailImage(iWidth,
iHeight, null, IntPtr.Zero);

// Set the ContentType appropriately
if (fileType == "JPG" || fileType == "JPEG") {
objThumbnail.Save(pathToThumbnailImage, ImageFormat.Jpeg);
}
else {
objThumbnail.Save(pathToThumbnailImage, ImageFormat.Gif);
}
objThumbnail.Dispose();
}

Thanks!

 

[Bob Powell [MVP]]

Image.FromFile keeps the file open. Get the file using a file stream and use
Image.FromStream then explicitly close the stream.

--
Bob Powell [MVP]
Visual C#, System.Drawing

All you ever wanted to know about ListView custom drawing is in Well Formed.
http://www.bobpowell.net/currentissue.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/gdiplus_faq.htm

Read my Blog at http://bobpowelldotnet.blogspot.com

 

[Jeff S]

That fixed it - thanks.

Image.FromFile keeps the file open. Get the file using a file stream and use
Image.FromStream then explicitly close the stream.

--
Bob Powell [MVP]
Visual C#, System.Drawing

All you ever wanted to know about ListView custom drawing is in Well Formed.
http://www.bobpowell.net/currentissue.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/gdiplus_faq.htm

Read my Blog at http://bobpowelldotnet.blogspot.com

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