Displaying a listbox of viewboxes

Question

Hi,

I have a list box that I'm trying to populate with a list of viewboxes. The listbox takes in the list without a problem. However, when my function reaches its end, I receive the error:

"Must disconnect specified child from current parent Visual before attaching to new parent Visual."

The viewboxes are created from the same initial viewbox and then edited, which I believe may be my problem.

for(...)
{
        Viewbox newviewbox = (Viewbox)myViewbox; //myViewbox created in XAML
        // edits newviewbox here
        viewboxlist.Add(newviewbox); //viewboxlist created upon initialization
        newviewbox = null;
    }
myListBox.ItemsSource = viewboxlist;

Any advice is greatly appreciated.

Thanks.

Answer 1

You are not creating new viewboxes, you are just referencing the same viewbox and adding it to the list several times. Thus the error that the viewbox already have a parent and should be disconnected before assigning it to a new parent.

You should create new instances of ViewBox like this:

var newViewBox = new ViewBox();

Answer 2

A Visual can only have one parent. In your code, you're taking an existing Visual and try to add it to another parent (the ListBox), so it can't work. You have to either remove it from the original parent, or create a new one