error with list of usercontrol in wpf

Question

I create a wpf app with several UserControls and in one of them I want have a list of another usercontrol, I used from observable collection that manage easy it but when I add item to this list in designer and build solution, user control gone and show error.

Cannot create an instance of " Component".

Exception: Cannot create an instance of " Component".

errors: The component Project. Component' does not have a resource identified by the URI '/ Project;component/component.xaml'.

I create observableCollection and if I create observableCollection problem be solved but I need to collection of my userControl. When I run app I haven't problem and only in designer problem occurred.

Edited:

   public partial class my_Component : UserControl
    {

        private ObservableCollection<user_Component> userCollection;
        public ObservableCollection<user_Component> UserCollection
        {
            get { return userCollection; }
        }
        public my_Component()
        {
            userCollection = new ObservableCollection<user_Component>();
        }


In xaml:
    <cc:my_Component >
        <cc:my_Component.userCollection>
            <cc:user_Component/>
        </cc:my_Component.userCollection>
    </cc:my_Component>

Answer 1

通过使用ObservableCollection的'DependencyProperty'解决了此问题。