Update the List view observable collection using MVVM

Question

I have a usercontrol, with one list box and one list view control in it. For Listview i have bound the observablecollection of type TrafficManager class as shown below:

   private static ObservableCollection<TrafficManager> _trafficCollection;
            public ObservableCollection<TrafficManager> TrafficCollection
            {
                get { return _trafficCollection; }
                set
                {
                    _trafficCollection = value;
                    OnPropertyChanged("TrafficCollection"); 
                }
            }

I have bound this to itemsource of list view. Now my requirement is on selection of the listbox item, i need to filter some items of the listview. For that i used a linq to get the desired rows from list view and added that to the list view collection. Before adding i did a listview Collection TrafficCollection.Clear() and then added to that collection.But now the issue is on selection of another item in list box i need the original listview contents again to carry out the filtering using the linq again. Here once the TrafficCollection.Clear() executes the original observable collection data vanishes. How do i maintain a backup of original observable collection data "TrafficCollection" of listview. Remember i have only one view. Is there anyway to do this? Please let me know.

http://stackoverflow.com/questions/14497506/collectionviewsource-how-to-filter-data — WPFUser, Dec 19 '16 at 12:15
You hold onto the original items instead of throwing them away. Your VM can have more than one collection holding references to the same items. — , Dec 19 '16 at 15:15
Thank you, but can you let me know how to hold references to same class items. If I modify the items through add or remove won't the reference collection also get modified? — ImHere, Dec 20 '16 at 04:54

score 0 · Accepted Answer · edited May 23 '17 at 10:30

0

you can use CollectionViewSource filtering, refer here

SO Link: Trigger Filter on CollectionViewSource

this will not clear original collection.

edited May 23 '17 at 10:30

Community

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answered Dec 19 '16 at 12:12

WPFUser

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Thanks. But i use a observable collection for list view and its in WPF. – ImHere Dec 19 '16 at 12:17
yes it is WPF and Instead of List, you can use ObservableCollection. – WPFUser Dec 19 '16 at 12:18
@santhosh see updated SO link. it covers MVVM implementation also – WPFUser Dec 19 '16 at 12:27
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@WPFUser If you are interested in interactive help, feel free to visit the [WPF chat room](http://chat.stackoverflow.com/rooms/18165/wpf). We cater to WPF w/ MVVM. – Lynn Crumbling Dec 19 '16 at 13:05

Update the List view observable collection using MVVM

1 Answers1