correct syntax is:
if( (reference.Target as Bitmap) ==null)
On Thu, Jun 21, 2012 at 2:42 AM, bjarke <j...@itai.dk> wrote:
> 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
>
> --
> View this message in context:
> http://mono-for-android.1047100.n5.nabble.com/Not-catching-null-reference-why-tp5710468.html
> Sent from the Mono for Android mailing list archive at Nabble.com.
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