C# custom event handlers

Question

If I have a property:

public list<String> names { get; set; }

How can I generate and handle a custom Event for arguments sake called 'onNamesChanged' whenever a name gets added to the list?

Answer 1

A BindingList is likely your best option as it has builtin change tracking and a variety of existing events you can use. Below is an example of exposing a custom event for Add which forwards to the BindingList event.

    class Example
    {
        private BindingList<string> m_names = new BindingList<string>();
        public IEnumerable<string> Names { get { return m_names; } }
        public event AddingNewEventHandler NamesAdded
        {
            add { m_names.AddingNew += value; }
            remove { m_names.AddingNew -= value; }
        }
        public void Add(string name)
        {
            m_names.Add(name);
        }
    }