I write a control that displays a list of items (in this case just strings). I gave the developer a list of items where he can add and remove items (see code below). I wished there would be a way to be notified when a new item has been added and stuff. So as a reaction the control can update.
private List<string> items = new List<string>();
public List<string> Items
{ get { return items; } }
How can I do that ? List<...> has no events. What can I do ?
Have a look at BindingList<T> and ObservableCollection<T>. This answer explains the difference between the two.
Apart from binding, you can subscribe to the change events like so:
BindingList<T>.ListChanged:
items.ListChanged += (sender, e) => {
// handle the change notification
};
ObservableCollection<T>.CollectionChanged:
items.CollectionChanged += (sender, e) => {
// handle the change notification
};
Use ObservableCollection<string> instead of a List. That class comes with built-in support for change notification events.
