Change Notification in MVVM Hierarchies

Question

Let\'s say in some abstract ViewModel base-class I have a plain-old property as follows:

public Size Size
{
    get { return _size; }
    set
    {
        _size         


        

Answer 1

I use Josh Smith's PropertyObserver, which you can get from his MVVM Foundation library at http://mvvmfoundation.codeplex.com/.

Usage:

_viewmodel_observer = new PropertyObserver(_OtherViewModel)
   .RegisterHandler(m => m.Size, m => RaisePropertyChanged(Rectangle);

Brian's attribute approach is nice too. One thing I like about PropertyObserver is that I can execute arbitrary code; allowing me to check conditions which may make me avoid the raise or perform other actions all together.