This article will show you another improvement which can be made to the DataBinding sample aspect found on SharpCrafters, after the Fire INotifyPropertyChanged.OnPropertyChanged for read-only properties depending on other properties article.
By default, the aspect will fire the PropertyChanged event each time any property is changed. But what if you don't want some of them to fire the event? Or what if, as it happened to me, you set the value of a property, and must do some work in the property setter, even if the new value of the property is the same as the old one?
The latter example is a bit odd, but in the default implementation of the aspect, in the OnPropertySet method, you have this code:
if ( args.Value == args.GetCurrentValue() ) return;
args.ProceedSetValue();If the new value of the property is the same, the aspect will return, and then never call the args.ProceedSetValue(); method, which will avoid your code to be called in the property setter.
In this short article, I'll show you how to change the aspect, to call the OnPropertyChanged event on all properties, excepted those which are marked with a custom attribute.