Picturebox keeping Image file open?

[rliq]

In my initialisation I have:

 // read the image
 Image thumbnailImage = Image.FromFile(thumbnailFilename);

 // put the image in a picturebox
 PictureBox pb = new PictureBox();
 pb.Image = thumbnailImage;

Later on, I allow the user to right-click on the PictureBox and choose to remove the image. However, when I try to:

 File.Delete(thumbnailFileName);

It reports the Image file as being open by another process. Similarly if I try to delete it from within Windows Explorer it reports the file is open in vshost32-clr2.exe.

How can I put an Image from a File into a PictureBox, without keeping the file open?

[invader7]

before

File.Delete(thumbnailFileName);

try to put

pb.Image.Dispose();

[rliq]

Thanks, that fixed it. Infact I had already tried

pb.Dispose();

which had not worked.

[Arjay]

Another way to do this is to open the image from a Stream with a using block.

[rliq]

Using a stream maybe neater. I am in the 'get it working' phase at the moment, I'll try that on my first refactor...

Thanks to both for the ideas.

[rliq]

I'm still having fun with this. I think my current problem(s) may all be related to the following question:

This works:

Image image;

using (FileStream fs = new FileStream(imageFileName, FileMode.Open))
{
    _image = Image.FromStream(fs);
    _image.Save(anotherFileName);
}

But this gives 'A generic error occured in GDI+'

Image image;

using (FileStream fs = new FileStream(imageFileName, FileMode.Open))
{
    _image = Image.FromStream(fs);
}
_image.Save(anotherFileName);  // <-- errors here

It seems as though the Image remains 'attached' to the FileStream, which has been disposed in the second example. Also, it seems that Image.FromFile(...) causes the Image to remain attached to the File.

How can I get an Image from a file and detach it from everything, so another process can overwrite the original file for example?

[foamy]

I don't think you can detach it from the file system as such, but you could copy the file to a temporary directory and display the copy to the user. Then the original file should be left open.