Question

I have a left-hand side (lhs) list box and right-hand side (rhs) list box I want to be able to select items in the lhs listbox and add one or all of them to the rhs listbox. Then I’d also like a remove one or all from the rhs returning them to the lhs. How would I accomplish this? So far, I can only manage getting the index value of the lhs box to the right but it won’t take the actual item name for some reason. This is the code that does that:

    private void SelectOne_Click(object sender, RoutedEventArgs e)
    {
        listBoxFin.ItemsSource = listBoxStart.SelectedIndex.ToString();          
    }

Answer 1

As H.B. noted, there are many ways this could be accomplished. Probably the most widely acclaimed architecture for WPF is MVVM, so I’ll try to outline a solution with respect to my understanding of that architecture.

The ViewModel will expose a few different properties: LHSList, LHSSelectedItem, RHSList, RHSSelectedItem (collections are ObservableCollections here) as well as a few commands – MoveLHSSelectedToRHS, MoveLHSToRHS, MoveRHSSelectedToRHS, MoveRHSToLHS.

The lists are simple bindings to the ListViews in the View, and the SelectedItem’s of those ListViews are also bound accordingly. The commands simply operate on the lists and the selected items. For example, MoveLHSSelectedToRHS would be a command with an action something like:

public void OnMoveLHSSelectedToRHS()
{
if(LHSSelectedItem==null)
return;
RHSList.Add(LHSSelectedItem);
LHSList.Remove(LHSSelectedItem);
LHSSelectedItem=null;
}

Unfortunately, it looks like you are using code behind at the moment. If you are not familiar with MVVM, I’d suggest looking into Josh Smith’s WPF articles – they’re a great place to start!