I'll hope this is a known issue, but...
I was looking to upgrade from Visual Studio 2010 to 2012, and began testing it out. Immediately, something went wrong with combo boxes. ItDOES NOT UPDATE the Text or SelectedItem property when they are bound to our data object classes. This happens with every combobox across our application. One example is below.
<my:MyComboBox x:Name="my_select" Text="{Binding Instance.UserLoginInfo.SelectedNumber, Mode=TwoWay}" ItemsSource="{Binding Instance.Profile.PickList}" DisplayMemberPath="ItemName" HorizontalAlignment="Right" VerticalAlignment="Bottom" FontSize="21.333" Width="180" Margin="0,8,0,0" />About this code:
- .NET 4.5 is installed, but the target build for the application is still ".NET Framework 4"
- MyComboBox inherits directly from ComboBox.
- The PickList comes from a local database.
- I DO see the proper items list in the combobox.
- When I override the OnSelectionChanged method, I do receive the call, but I still do not see the binding being updated.
- The same, exact code, with no changes whatsoever, works on VS 2010/.NET 4.0.
- I've even tried verifying (via GetHashCode) that the referenced objects are what they should be.
Now, before anyone asks, we've already done our due diligence with regard to this issue:
- The data object class UserLoginInfo implements INotifyPropertyChanged. Again, it works with VS 2010/.NET 4.0 with no changes.
- The binding path is correct. Again, it works with VS 2010/.NET 4.0 with no changes.
- If I change the inheritance from ComboBox to a third-party dropdown (specifically ComponentOne's C1ComboBox), it works.
If there is any guidance to offer regarding this issue, I'd be very happy to hear it.