Binding source of Image is not work

[jeff9571]

I tried to bind a WriteableBitmap property to Image source, when I change the WriteableBitmap property , the UI is not update.

If I directly set to Image source, it can be changed, but this way can not crop a image.

So how can I bind cropped bitmap to image source, and update it dynamically?

[timunie]

you need to invalidate the Visual after the Bitmap has changed. Until today, RTB doesn't support it but this feature is planned irrc.

[jeff9571]

what is RTB by the way?

[timunie]

RichTextBlock but now it was renamed to SelectableTextBlock iirc.