Question

I have a ComboBox that has its ItemSource and SelectedItem properties bound to a view model. And I have the following block of code that is the callback for a data query against a DomainContext:

    /// <summary>
    /// Stores (readonly) - Stores available for ship to store.
    /// </summary>
    public ObservableCollection<StoreEntity> Stores
    {
        get { return _stores; }
        private set { _stores = value; RaisePropertyChanged("Stores"); }
    }

    /// <summary>
    /// SelectedStore - Currently selected store.
    /// </summary>
    public StoreEntity SelectedStore
    {
        get { return _selectedStore; }
        set { _selectedStore = value; RaisePropertyChanged("SelectedStore"); }
    }

    /// <summary>
    /// When stores are completely loaded.
    /// </summary>
    /// <param name="a_loadOperations"></param>
    protected void OnStoresLoaded(LoadOperation<StoreEntity> a_loadOperations)
    {
        Stores.AddRange(a_loadOperations.Entities);
        SelectedStore = a_loadOperations.Entities.FirstOrDefault();
    }

In this example, Stores is a ObservableCollection<StoreEntity> (AddRange is an extention method) and is bound to ItemSource, and SelectedStore is a StoreEntity and is bound to SelectedItem.

The problem here is that the ComboBox is not changing its selection to reflect the change in SelectedItem.

Edits:

I’ve even tried the following, though I think that a_loadOperation.Entities is already a realized set:

    /// <summary>
    /// When stores are completely loaded.
    /// </summary>
    /// <param name="a_loadOperations"></param>
    protected void OnStoresLoaded(LoadOperation<StoreEntity> a_loadOperations)
    {
        var entities = a_loadOperations.Entities.ToArray();
        Stores.AddRange(entities);
        SelectedStore = entities.First();
    }

Thanks

Answer 1

I had SelectedItem bound to Stores instead of SelectedStore. Ooops!