still memory-leaks in .net4 - binding memory BitmapImage to Image-Source

问题

I know very similar questions were asked here in the past - but neither had a solution for my problem:

I load a image from memory into a BitmapImage:

    private static BitmapImage LoadImage(byte[] imageData)
    {
        if (imageData == null || imageData.Length == 0) return null;
        var image = new BitmapImage();
        using (var mem = new MemoryStream(imageData))
        {
            mem.Position = 0;
            image.BeginInit();
            image.CreateOptions = BitmapCreateOptions.PreservePixelFormat;
            image.CacheOption = BitmapCacheOption.OnLoad;
            image.UriSource = null;
            image.StreamSource = mem;
            image.EndInit();
        }
        image.Freeze();
        return image;
    }

And then use this (with INotifyPropertyChange) to bind the resulting BitmapImage to the Source of a Image object (on a Page).

Problem is: this will leak memory (a lot in my case up to 300MB on 2-3 images!)

You don't even find this using Profilers - only the .net Memory Profiler got me on track (as it's in unmanaged memory where all the bytes go - so ANTS tell me ".NET is using 19,24MB of 367,3MB total private bytes allocated to the application" - nice):

No matter what I try - I don't get this leak away. Tried (single and all at once):

clear the Visual-Tree / remove the Image on Unload
Set the Image-Source to null
use ImageBrush in Rectangle instead of Image
other CacheOptions without Disposing the MemoryStream
don't Freeze the Image

I don't get this - really! As soon as I stop using the Image in the Source everything is ok (no leak).

Someone any options I can try?

REMARK Seems like this is no bug at all (see my second comment) - I have to check this so I will let the question open for now - maybe this can help with the other questions on this as well

回答1:

Sorry guys - this was indeed no "BUG" but caused by high-resolution pictures.

Please comment on this if I should delete the question or if I should leave it here as other people might come into the same situation...

来源：https://stackoverflow.com/questions/9175755/still-memory-leaks-in-net4-binding-memory-bitmapimage-to-image-source

标签

wpf

memory-leaks

bitmapimage

imagesource