What's the c# quivalent of this Xaml?

<Image x:Name="TargetImage"
RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToView, ElementName=ZXingScannerView1, Property=Y, Constant={StaticResource TargetYConstant}}"
RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToView, ElementName=ZXingScannerView1, Property=X, Constant={StaticResource TargetXConstant}, Factor=0.80}">

Where TargetYConstant and TargetXConstant are variables in ResourceDictionary Keys in App.Xaml