Delete image created by Interop Powerpoint in WPF Application - wpf

Question

I wrote a WPF Application that opens a PowerPoint presentation and save the slides as images to be displayed in a PictureBox. The PictureBox is bounded to ImageBitmap property.
PowerPoint.Application app = new PowerPoint.Application();
PowerPoint.Presentations pres = app.Presentations;
p = pres.Open(FileName, ofalse, ofalse, otrue);
p.Slides[0].Export(ImagePath, "png", 640, 480);
ImageBitmap = new BitmapImage(new Uri(ImagePath));
When the application is closed, I would like to delete all the image files created, but instead I got an error: "“The process cannot access the file because it is being used by another process”.
I have determined (using ProcessExplorer) that the files were being used only by my application.
I read some suggestions that using the code below will allow the image file (located in ImagePath) to be deleted, but I think this will break MVVM since the viewModel now knows about the View.
Image im = GetCopyImage(#"D:\Temp\AAAA.jpg");
myPictureBox.Image = im;
File.Delete(#"D:\Temp\AAAA.jpg");
}
private Image GetCopyImage(string path)
{
using (Image im = Image.FromFile(path))
{
Bitmap bm = new Bitmap(im);
return bm;
}
}

Answer 1

You may set the BitmapCacheOption.OnLoad option during initialization of the BitmapImage. This lets WPF close the image file right after loading the image.
var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.CacheOption = BitmapCacheOption.OnLoad;
bitmap.UriSource = new Uri(ImagePath);
bitmap.EndInit();
ImageBitmap = bitmap;