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Editorial Team
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Asked: 2026-05-14T20:04:01+00:00

I have two classes A & B, and a listbox. I assign listBox.ItemsSource equal

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I have two classes A & B, and a listbox. I assign listBox.ItemsSource equal to a collection of objects of type A. The listbox items are visualized using silverlight data templating, see http://msdn.microsoft.com/en-us/library/system.windows.datatemplate.aspx and http://www.codeproject.com/KB/WPF/UserControlAsDataTemplate.aspx for example. The listbox.ItemTemplate is a DataTemplate that uses class B to visualize the listbox items. Now, in my code-behind, inside any method of class B, if I do this.DataContext, it points to an object of type A. Thus, given an object of type B, I can find the corresponding object of type A. So far so good. My question is, given an object of type A, how can I navigate to the corresponding object of type B? Is this even possible in SL?

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1 Answer

  1. Editorial Team

    On the surface of things you should be able to use code like this:-

      ListBoxItem item = (ListBoxItem)myListBox.ItemContainerGenerator.ContainerFromItem(myTypeA);
  MyTypeB typeB = (MyTypeB)item.Content;

    However this may not work in all cases. There is no guarantee that the ListBox has even generated a ListBoxItem for every object in the ItemsSource.

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