[mono-android] Not catching null reference - why?

[bjarke]

Hey guys

I have a list of bitmaps with weak references however sometimes the bitmap
is null. This is okay and as expected however my issue is that it does not
work doing a check against null. This is my method;

  public static Bitmap DecodeFile(string _path)
        {
            WeakReference reference;
            var options = new BitmapFactory.Options {InPreferredConfig =
Bitmap.Config.Rgb565};
            Bitmap image=null;
            //refs is a dictionary of Dictionary<string, WeakReference> 
            if (refs.TryGetValue(_path, out reference))
            {
                    if (reference.IsAlive)
                    {
                        image = (Bitmap)reference.Target;

                        if (image==null)
                        {
                        // image has been garbage collected
                        // remove reference from cache
                            refs.Remove(_path);
                        }
                        else
                        {

                            return image;
                        }


                    }
                    else
                    {
                        // image has been garbage collected
                        // remove reference from cache
                        refs.Remove(_path);
                    }

                }
            image = BitmapFactory.DecodeFile(_path, options);
            reference = new WeakReference(image);
            refs.Add(_path, reference);
            return image;
        }

The check if(image==null) is false even though it is null. If I do a
image.Equals(null) I get a nullpointer exception instead. So right now I
catch the exception instead and handle it - however I really do not like
that approach.

Any suggestion is well recieved :)

Regards Bjarke

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