INotifyPropertyChanged allows WPF UI elements (via the standard data binding mechanisms) to subscribe to the PropertyChanged event and automatically update themselves. For example, if you had a TextBlock displaying your FirstName property, by using INotifyPropertyChanged, you can display it on a form, and it will automatically stay up to date when the FirstName property is … Read more
The spot you have commented as // Code to trig on item change… will only trigger when the collection object gets changed, such as when it gets set to a new object, or set to null. With your current implementation of TrulyObservableCollection, to handle the property changed events of your collection, register something to the … Read more
I strongly disagree with the concept that the Model should not implement the INotifyPropertyChanged. This interface is not UI specific! It simply informs of a change. Indeed, WPF heavily uses this to identify changes, but that doesn’t mean it is an UI interface. I would compare it to the following comment: “A tire is a … Read more
Here is a drop-in class that sub-classes ObservableCollection and actually raises a Reset action when a property on a list item changes. It enforces all items to implement INotifyPropertyChanged. The benefit here is that you can data bind to this class and all of your bindings will update with changes to your item properties. public … Read more
Implementing INotifyPropertyChanged – does a better way exist?