public static IDisposable ListenPropertyChanged <T>(
this INotifyPropertyChanged source, Expression <Func <T> > propertyExpression,
Action <PropertyChangedEventArgs> handler)
{
var propName = ExtractPropertyName(propertyExpression);
if (propName == null)
{
throw new ArgumentException("Unknown property name.");
}
return(source.ListenPropertyChanged(e =>
{
if (e.PropertyName == propName)
{
handler(e);
}
}));
}
