private void propertyChanged(object sender, PropertyChangedEventArgs e)
{
Contract.Requires(sender != null);
Contract.Requires(e != null);
var propertyInfo = sender.GetType().GetProperty(e.PropertyName);
Contract.Requires(propertyInfo != null, $"No public property '{e.PropertyName}' could not be found on an instance of type '{sender.GetType().FullName}'");
if (IncludeDeep(sender, e.PropertyName))
{
if (!(e is IPropertyMutatedEventArgs m))
{
throw new ContractException("For view model properties that have nested viewmodels, the old value needs to be accessible (for unregistering). ");
}
// Alternatively, we may store the old values ourselves.
// A potential bug (or it's more like an assumption) is this:
// Suppose a property is mutated, but it's property changed event invocation is suspended, then it is modified again, and then the event is raised.
// Here I'm assuming that the old value is then the original value, not the intermediate value, because I still need to unregister the original value
if (m.OldValue != null)
{
this.unregisterViewModel(m.OldValue);
}
if (m.NewValue != null)
{
this.registerViewmodelAndAddCompleteStateAsChanges(m.NewValue);
}
}
if (IncludeProperty(sender, propertyInfo))
{
var value = propertyInfo.GetValue(sender);
this.AddChange(PropertyChange.Create(idProvider[sender], e.PropertyName, value));
}
}
public void Accept(INotifyPropertyChanged container)
{
int containerId = this.idProvider[container];
foreach (var propertyInfo in GetIncludedProperties(container))
{
object value = propertyInfo.GetValue(container);
this.changes.Add(PropertyChange.Create(containerId, propertyInfo.Name, value, idProvider));
}
}
public void Execute(object parameter)
{
System.Threading.Thread.Sleep(3000);
userSession.RegisterChange(PropertyChange.Create(0, "prop", 1));
}