Question

I have a WPF ListView with many items in it. When I select several of them, I want to be able to remove them with a button. The problem I am having is that I can remove ONE item from the ListView, but then when I iterate the second time, I get a:

Collection was modified; enumeration operation may not execute.

Error because of the last removal modifying the ItemSource of that ListView. What is the best way to do this? I tried making a copy of the selected items but I don’t know what type to use.

Answer 1

Save the collection of selected items in a local variable that won’t change, then you can iterate over that without problems.

e.g.

var selected = lv.SelectedItems.Cast<Object>().ToArray();
foreach (var item in selected) lv.Items.Remove(item); // or whereever you need to remove them...

(Cast<T> and ToArray are extension methods)