Image source based on properties value in Xamarin.Forms - properties

Question

I've got a custom MyCachedImage that inherits from FFImageLoading.Forms.CachedImage, which is used in a ListView to display images.
The source of this image is composed by 2 properties: a custom object as entity and an integer as size.
Let's say if entity is a "city" object and size is 10 then the image source will be "http://..../city/10/image.png"
Image source must be setted only when both properties are valorized.
So, my answer is, how and when create the source url?
MyCachedImage.vb
public class MyCachedImage : CachedImage
{
public static readonly BindableProperty EntityProperty =
BindableProperty.Create(nameof(Entity), typeof(MyObject), typeof(MyCachedImage));
public MyObject Entity
{
get { return (MyObject)GetValue(EntityProperty); }
set { SetValue(EntityProperty, value); }
}
public static readonly BindableProperty SizeProperty =
BindableProperty.Create(nameof(Size), typeof(int), typeof(MyCachedImage), defaultValue: 0);
public int Size
{
get { return (int)GetValue(SizeProperty); }
set { SetValue(SizeProperty, value); }
}
public MyCachedImage()
{
??? set source here?
}
protected override void OnBindingContextChanged()
{
??? set source here?
}
}
MyPage.xaml
<ListView ....>
....
<control:MyCachedImage Size="10"
Entity="{Binding MyObject}"
WidthRequest="40"
HeightRequest="40" />
....
</ListView>

Answer 1

I was wondering on when create that string and I found the right solution.
The OnBindingContextChanged is called when all properties are setted, so:
protected override void OnBindingContextChanged()
{
base.OnBindingContextChanged();
if (_source == string.Empty)
{
Source = Helpers.ImageHelper.UriFromEntity(Entity, ImageSize);
}
}