Conditional Resources Creation WPF XAML Design / Run time

Question

Following a first question on WPF Cascading Binding,

I remarked that I had more Resources than desired defined in both the MainWindow

Answer 1

I will finally try to answer my own question

Result is as awaited no "duplicate resources" in the lower level ViewModel instances The result in snoop:

The XAML code

Note the new line:

d:DataContext="{d:DesignInstance {x:Type vm_nmspc:my_usercontrol_vm}, IsDesignTimeCreatable=True}"

And there is absolutely no other modifications !!

The trick is to use the IDE to support you ( if you are unaware of the syntax that will result in the XAML ).

I will try to illustrate what I did.

Choose your object, and in the format menu choose Set Design Time DataContext

Then choose your DesignInstance ( here the ViewModel my_usercontrol_vm) and do not forget to tick IsDesignTimeCreatable

This created the magic line in the Ellipse declaration but I moved it on the top of the XAML.

So this answered my question. It is possible with no deep knowledge on WPF/XAML to make all your subviews (controls) "rendered" without the additional cost of wasted resources of viewmodels

To give echo to what Maximus gave in the first answer, I found also another post (will try to find it again and quote it in a next edit) using directly the function DesignerProperties.GetIsInDesignMode( )

public partial class UserControl1 : UserControl
{
    public UserControl1()
    {

        InitializeComponent();

        if (  DesignerProperties.GetIsInDesignMode(this))
        {
            //Do what you want here for design time specific actions
        }
    }
}