public static void OnPropertyChanged <T>(this INotifyStateChange self, Expression <Func <T> > property,
Action <T> action)
{
var propertyName = PropertyName.For(property);
self.HookToPropertyChangedEvent(propertyName, action);
}
public static void NotifyOnChange <T>(this INotifyStateChange self, Expression <Func <T> > dependentProperty,
params Expression <Func <object> >[] dependsOn)
{
var propertyName = PropertyName.For(dependentProperty);
var dependsOnProps = dependsOn.Select(PropertyName.For).ToArray();
self.NotifyOnChange <T>(propertyName, dependsOnProps);
}
public static void NotifyOnChange <T>(this INotifyStateChange self, string dependentProperty,
params string[] dependsOn)
{
foreach (var dependsOnPropName in dependsOn)
{
self.HookToPropertyChangedEvent <T>(dependsOnPropName, c => self.RaisePropertyChanged(dependentProperty));
}
}
private static void StateChanged(INotifyStateChange self, string name, object value)
{
self.RaisePropertyChanged(name);
var tracking = (self as IChangeTracking);
if (tracking != null)
{
tracking.TrackChanges(name, value);
}
}
private static void HookToPropertyChangedEvent <T>(this INotifyStateChange self, string propertyName,
Action <T> action)
{
self.PropertyChanged +=
(sender, args) =>
{
if (string.CompareOrdinal(args.PropertyName, propertyName) == 0)
{
action((T)self.GetProperty(propertyName));
}
};
}
public static void RaisePropertyChanging(this INotifyStateChange self, string propertyName)
{
RaisePropertyChangedEventInternal(self, new PropertyChangingEventArgs(propertyName), "PropertyChanging");
}
public static void RaisePropertyChanged(this INotifyStateChange self, Expression <Func <object> > property)
{
var name = PropertyName.For(property);
RaisePropertyChangedEventInternal(self, new PropertyChangedEventArgs(name), "PropertyChanged");
}
private static void StateChanging(INotifyStateChange self, string name, object value)
{
self.RaisePropertyChanging(name);
}
