Problem loading BitmapImage in WPF

[Laurent Bugnion]

Hey guys,

 

I am trying to load a stream from a local file, assign to a BitmapImage, and then later in the application, the file may be moved to another location.

 

I am trying this:

 

            using (var stream = File.OpenRead(fileInfo.FullName))

            {

                duplicate.Image = new BitmapImage

                {

                    CacheOption = BitmapCacheOption.OnLoad

                };

                duplicate.Image.BeginInit();

                duplicate.Image.StreamSource = stream;

                duplicate.Image.EndInit();

            }

 

However the image is not fully loaded (I see a gray rectangle in the UI).

 

I then tried

 

            var stream = File.OpenRead(fileInfo.FullName);

            duplicate.Image = new BitmapImage

            {

                CacheOption = BitmapCacheOption.OnLoad

            };

            duplicate.Image.BeginInit();

            duplicate.Image.StreamSource = stream;

            duplicate.Image.EndInit();

 

(based on the documentation that says that BitmapCacheOption.OnLoad will close the stream after the BitmapImage is created). However, when I try to move the file, I get an error saying that it is used by another process, yadayadayada.

 

What am I missing? (NB: Same thing when I try with UriSource).

 

BTW in XAML I just do

<Image Source="{Binding Image}"

       Height="98"

       Cursor="Hand">

 

Cheers

Laurent

--

Laurent Bugnion

Director, UX Integration Development, IdentityMine

Microsoft MVP, MCP

www.galasoft.ch | blog.galasoft.ch

 

[Jeremiah Morrill]

While I'm not sure how to fix this specific issue, as it looks like the read of the file stream is happening asynchronously (or sync but later) and not closing the stream.

I would copy the file stream to a byte[], then to a new memory stream.  Close the filestream, then assign the new memory stream to the image.  

-Jer

--
Microsoft MVP - Client Application Development

HJT, Inc Software Developer

[Laurent Bugnion]

Yeah that was my analysis too. I was hoping to avoid that step…

 

Cheers!

Laurent

[Jeremiah Morrill]

Yeah if you do have to go the MemoryStream route, don't forget to set the Position to 0.  That still gets me every time!

-Jer

[Peter O'Hanlon]

I like to use code like this:

Uri uri = new Uri(filename, UriKind.Absolute);

img = new BitmapImage();

img.BeginInit();

img.CreateOption = BitmapCreateOptions.IgnoreImageCache;

img.CacheOption = BitmapCacheOption.OnLoad;

img.UriSource = uril

img.EndInit();

image.Source = img;

Regards

Pete

--
Peter O'Hanlon

[Sacha Barber]

I do it how Pete does it also

--
Sacha Barber
sacha....@gmail.com