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How to filter ItemsControl View, rather then Data Source

How to filter data source of ItemsControl, you, probably, know, but what to do, when you want to filter view of the control’s items, rather then the data behind? What’s the strange requirement, you’ll ask. I’ll give you very simple example for business case, when you need to filter only what you are viewing in ListBox or any other items control, rather then data behind. You have two listboxes bounded to the same data source. In one, and only one, of those listboxes you want to filter data. What to do?

image

If  you’ll filter data by using CollectionViewSource.GetDefaultView(YourListBox.ItemsSource).Filter = new Predicate(FilterOdds) statement or, even YourListBox.Items.Filter = new Predicate(FilterOdds) statement, you’ll filter data in both ListBoxes. This is not what you want. You need to filter the view of the data and not a data itself.

Just enumerate listbox items and Collapse “unnecessaries”, according predefined criteria. Like following:

for (int i = 0; i < MyListBox.Items.Count; i++)
{
  ListBoxItem itm = MyListBox.Items[i] as ListBoxItem;
   if (FilterOdds(itm.Content))
    MyListBox.Items[i].Visibility = Visibility.Collapsed;
}

image

But, if you want to be even more precise, pay attention on what has been virtualized and what has not by getting underlying VirtualizingStackPanel and enumerating and operating it’s items. How to do it? Get and see in source code for this article.

UPD: This article was read by a couple of hundrends of visitors, however only one sent me an e-mail (comments are not working?) about a mistake. Try to imagine, that data source was changed. What are you think will happen to bounded listbox? That’s right, this will not be updated, due to fact, that we filtered view, not source. What to do? When you want to filter your view, subscribe to DataChanged event of it’s data source. There perform filterring. Don’t forget to unsubscribe, when you’re removing the filter.

Source code was updated. Please, fix my mistakes. I’m only human and sometimes (not too ofter) I’m getting wrong… Tnx to Zahi, who notice me about an error.

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3 Responses to “How to filter ItemsControl View, rather then Data Source”

  1. Noticias externas Says:

    How to filter data source of ItemsControl, you, probably, know , but what to do, when you want to filter

  2. Tamir Khason Says:

    That’s right

    I saw the approach of Bea, however in her case we are creating another instance of data source. What’s happens if our data size is 1Mb or, even more? What’s happens, if I have 2,000 controls binded to the datasource?

    As said above, this is one of possible approaches to treat data view without copying, Bea’s is another approach, which is really nice

  3. Anonymous Says:

    What about wrapping the datasource in an objectdataprovider to get separate views of the same data, that can independently be filtered?

    Just like in Bea Costa's nice blog entry:

    http://www.beacosta.com/blog

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