Wpf image binding

Revit
1

I have problem using picturebox in wpf, I cannot set the path in xaml, so I want to bind it to the main script.
my xaml has the following:

<Image x:Name="picturebox" HorizontalAlignment="Left" Height="250" Margin="20,20,0,0" VerticalAlignment="Top" Width="250" Stretch="Fill" Source="{Binding ImageSource}"/>

how do I bind that in main script?
I try:

def __init__(self):
    self.picturebox.Source = os.path.dirname(__file__) + r'\abc.png'

but not success
error:
TypeError: expected ImageSource, got str

2

ok just got the answer…suddenly works well now…

self.source = BitmapImage()
self.source.BeginInit()
self.source.UriSource = Uri(os.path.dirname(__file__) + r'\abc.png')
self.source.EndInit()
self.picturebox.Source = self.source