How to programmatically set the Image source
Try this:
BitmapImage image = new BitmapImage(new Uri("/MyProject;component/Images/down.png", UriKind.Relative));
myImg.Source = new BitmapImage(new Uri(@"component/Images/down.png", UriKind.RelativeOrAbsolute));
Don't forget to set Build Action to "Content", and Copy to output directory to "Always".
{yourImageName.Source = new BitmapImage(new Uri("ms-appx:///Assets/LOGO.png"));}
LOGO refers to your image
Hoping to help anyone. :)
Try to assign the image that way instead:
imgFavorito.Source = new BitmapImage(new Uri(base.BaseUri, @"/Assets/favorited.png"));