Maintain Selection State After Changing Backend Collection in ListView

Question

I have a listview control that is bound to an observable collection that I frequently update. When I update the collection, I clear the collection and then add the values. While this is a bit overkill for simple changes, it's very simple and accomplishes the job. In doing so, I lose which item was selected in my listview control and cannot figure out how to maintain the selected state after an update.

I initially thought I could two-way bind the SelectedValue by using the following (WPF):

SelectedValue="{Binding Path=SelectedDevice, Mode=TwoWay}

And then update my collection by:

string PreviouslySelectedDevice = this.SelectedDevice;
aCollection.Clear();
// ... Add Items ...
this.SelectedDevice = PreviouslySelectedDevice;

I was hoping the TwoWay binding would allow me to make changes to backend property which would be automagically reflected in the listView control but this doesn't work. Thanks in advance!

Answer 1

It seems like your binding should be updating SelectedValue. Is SelectedDevice a DependencyProperty or are you implementing INotifyPropertyChanged?