Is there any way to automatically update a filter on an ICollectionView
without having to call Refresh()
when a relevant change has been made?
I have the following:
[Notify]
public ICollectionView Workers { get; set; }
The [Notify] attribute in this property just implements INotifyPropertyChanged
but it doesn't seem to be doing anything in this situation.
Workers = new CollectionViewSource { Source = DataManager.Data.Workers }.View;
Workers.Filter = w =>
{
Worker worker = w as Worker;
if (w == null)
return false;
return worker.Employer == this;
};
In XAML:
<TextBlock x:Name="WorkersTextBlock"
DataContext="{Binding PlayerGuild}"
FontFamily="Pericles"
Text="{Binding Workers.Count,
StringFormat=Workers : {0},
FallbackValue=Workers : 99}" />
Update: It looks like using ICollectionView
is going to be necessary for me, so I'd like to revisit this topic. I'm adding a bounty to this question, the recipient of which will be any person who can provide some insight on how to implement a 'hands-off' ICollectionView
that doesn't need to be manually refreshed. At this point I'm open to any ideas.
For .Net 4.5: There is a new interface which can help to achieve this feature, called :
ICollectionViewLiveShaping
.From MSDN link:
More Info on above interface: http://www.jonathanantoine.com/2011/10/05/wpf-4-5-%E2%80%93-part-10-live-shaping/
For .Net 4 and lower: There is also another post on SO QA which might help you: CollectionViewSource Filter not refreshed when Source is changed
AFAIK there is no inbuilt support in
ICollectionView
to refresh collection on any property change in underlying source collection.But you can subclass
ListCollectionView
to give it your own implementation torefresh collection on any property changed
. Sample -You can use this in your project like this -
This can be reused across your project without having to worry to refresh collection on every
PropertyChanged
.MyCollectionView
will do thatautomatically
for you.OR
If you are using .Net4.5 you can go with
ICollectionViewLiveShaping
implementation as described here.I have posted the implementation part for your problem here - Implementing ICollectionViewLiveShaping.
Working code from that post -