c# - List<string> INotifyPropertyChanged event

Question

I have a simple class with a string property and a List property and I have the INofityPropertyChanged event implemented, but when I do an .Add to the string List this event is not hit so my Converter to display in the ListView is not hit. I am guessing the property changed is not hit for an Add to the List....how can I implement this in a way to get that property changed event hit???

Do I need to use some other type of collection?!

Thanks for any help!

namespace SVNQuickOpen.Configuration
{
    public class DatabaseRecord : INotifyPropertyChanged 
    {
        public DatabaseRecord()
        {
            IncludeFolders = new List<string>();
        }

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        protected void Notify(string propName)
        {
            if (this.PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propName));
            }
        }
        #endregion

        private string _name;

        public string Name
        {
            get { return _name; }

            set
            {
                this._name = value;
                Notify("Name");
            }
        }

        private List<string> _includeFolders;

        public List<string> IncludeFolders
        {
            get { return _includeFolders; }

            set
            {
                this._includeFolders = value;
                Notify("IncludeFolders");
            }
        }
    }
}

Answer 1

You should use ObservableCollection<string> instead of List<string>, because unlike List, ObservableCollection will notify dependents when its contents are changed.

And in your case I'd make _includeFolders readonly - you can always work with one instance of the collection.

public class DatabaseRecord : INotifyPropertyChanged 
{
    private readonly ObservableCollection<string> _includeFolders;

    public ObservableCollection<string> IncludeFolders
    {
        get { return _includeFolders; }
    }

    public DatabaseRecord()
    {
        _includeFolders = new ObservableCollection<string>();
        _includeFolders.CollectionChanged += IncludeFolders_CollectionChanged;
    }

    private void IncludeFolders_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        Notify("IncludeFolders");
    }

    ...

}