List firing Event on Change

Question

I created a Class EventList inheriting List which fires an Event each time something is Added, Inserted or Removed:

public          


        

Answer 1

ObservableCollection is a List with a CollectionChanged event

ObservableCollection.CollectionChanged Event

For how to wire up the event handler see answer from Patrick. +1

Not sure what you are looking for but I use this for a collection with one event that fires on add, remove, and change.

public class ObservableCollection: INotifyPropertyChanged
{
    private BindingList ts = new BindingList();

    public event PropertyChangedEventHandler PropertyChanged;

    // This method is called by the Set accessor of each property. 
    // The CallerMemberName attribute that is applied to the optional propertyName 
    // parameter causes the property name of the caller to be substituted as an argument. 
    private void NotifyPropertyChanged( String propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public BindingList Ts
    {
        get { return ts; }
        set
        {
            if (value != ts)
            {
                Ts = value;
                if (Ts != null)
                {
                    ts.ListChanged += delegate(object sender, ListChangedEventArgs args)
                    {
                        OnListChanged(this);
                    };
                }
                NotifyPropertyChanged("Ts");
            }
        }
    }

    private static void OnListChanged(ObservableCollection vm)
    {
        // this will fire on add, remove, and change
        // if want to prevent an insert this in not the right spot for that 
        // the OPs use of word prevent is not clear 
        // -1 don't be a hater
        vm.NotifyPropertyChanged("Ts");
    }

    public ObservableCollection()
    {
        ts.ListChanged += delegate(object sender, ListChangedEventArgs args)
        {
            OnListChanged(this);
        };
    }
}