Selection bug for listbox where the list items are value types / structs and contain duplicates?

Question

I turned an Horizontal ItemsControl to a Listbox so that I am able to select individual items but found that the selection was broken. Took some time to distill out the prob

Answer 1

I'm not clear on why you have duplicates in your list, if they're absolutely identical (i.e., if duplicates have all the same content and return true from Equals). You won't have any way to tell which of the duplicates the user has selected. Neither will the ListBox, which is probably why you're having problems.

Maybe, instead of binding directly to a collection of structs, you could wrap each struct in a class? Just define a BookWrapper class that contains a Book struct, and bind to a collection of BookWrappers instead of a collection of Books. You fix the problem of WPF not being able to tell the instances apart, but the rest of your code could continue to have the benefits of a struct.