Intersoft Community - ClientUI - UXComboBox throws Object reference not set to an instance of an object

UXComboBox throws Object reference not set to an instance of an object

yudi — Mon, 10 Sep 2012 21:28:50 GMT

Here, I re-attached the sample file. Please feel free to let us know if you still have difficulties to download the sample.

UXComboBox throws Object reference not set to an instance of an object

DaveDeSmet — Mon, 10 Sep 2012 11:54:36 GMT

Hi Yudi,

I can't download your sample, it corrupted.
I'll try to reproduce the problem with a sample code, since as I've said, previous to SP1 it was working.

UXComboBox throws Object reference not set to an instance of an object

yudi — Mon, 10 Sep 2012 06:59:01 GMT

I tried to reproduce the problem in my local test by creating a Silverlight project with UXComboBox and List<> but my efforts were not successful – everything worked smoothly and the project was run without any issues.

I enclosed my simple project as attachment. Should you find anything that I miss in the project, please feel free to let me know. You may also modify the sample so that it replicates the problem and then have the sample sent back to me for further investigation.

Thank you and have a nice day.

UXComboBox throws Object reference not set to an instance of an object

DaveDeSmet — Sat, 08 Sep 2012 17:27:52 GMT

I've created a BindingList and assigned it to the UXComboBox. So far, so good.

With the new version 2012 R1 SP1 I get the following error at runtime:

System.NullReferenceException: Object reference not set to an instance of an object.
at Intersoft.Client.UI.Controls.UXPopupManager.ShowOverlay(OverlayType type, UXPopup popup)
at Intersoft.Client.UI.Controls.UXPopupManager.ShowOverlay(UXPopup popup)
at Intersoft.Client.UI.Controls.UXPopupManager.Show(UXPopup popup, Boolean staysOpen)
at Intersoft.Client.UI.Controls.UXPopup. (Boolean isOpen)
at Intersoft.Client.UI.Controls.UXPopup. . . ()
at Intersoft.Client.Framework.DependencyObjectExtensions. . . (Object args)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

While with the previous version it worked fine. It also works fine using the .NET default ComboBox.

The xaml code is the following:

<Intersoft:UXComboBox Name="comboProduct" ItemsSource="{Binding Path=Products, UpdateSourceTrigger=PropertyChanged}" SelectedValue="{Binding Path=Id, Mode=OneWay}" DisplayMemberPath="Description" Width="160" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0,8,0,0" Grid.Row="0" />