Operation not supported on read-only collection

I have a ListBox with rows where each row consist of an "Image" and a "TextBlock". When I delete one row in the back with code like：

 this.UserListBox.Items.RemoveAt(this.UserListBox.SelectedIndex);

There it throws an exception:

Operation not supported on read-only collection.

How can I delete row from th开发者_运维百科e listbox?

I am writing a Windows phone 7 APP.

If you set ItemsSource on the ListBox, then Items is internally generated and readonly. In such case you need to delete the item from the supoplied item collection. If the collection implements INotifyCollectionChanged, then the collection changes are reflected in the listbox.

Instead of binding a List of items to your list box's itemsSource, you should instead use an ObservableCollection. This will fix the problem. The ObservabeCollection has a Remove method that you can use

UserListBox.Items.Remove(this.UserListBox.SelectedItem);