Databinding Image Source at Windows Phone

Question

I have datatable with byte[] column. On app page I iterate through rows and bind column data to SourceProperty

for (i = 0;..) {
    Image img = new Image();
    img.Width = 100;
    img.Height = 100;
    Binding bnd = new Binding("Fields[" + i + "].Blob"); // Blob column
    bnd.Converter = new ByteToImageConverter();
    img.SetBinding(Image.SourceProperty, bnd);
}

Near every image I have button that calls CameraCaptureTask camTask .

Before camtask.Show() I assign current Image to global pointer _imgCurrent = img

camtask.Completed += (s, e)
{
    if (e.TaskResult != TaskResult.OK) return;
    BitmapImage bmp = new BitmapImage();
    bmp.SetSource(e.ChosenPhoto);
    _imgCurrent.Source = bmp;
    _imgCurrent.SetValue(Image.SourceProperty, bmp);
}

But in that case DataContext don't update. I suppose that I need to implement INotifyPropertyChanged ? I need to inherit Image from that interface or I can trigger it in time of Source update?

Answer 1

问题出在绑定创建时：我忘记了Mode=TwoWay 。