Forums | NoesisGUI

Using Noesis in Unity to rewrite/port an old Silverlight App. Most things are going great. However I've run into a problem.

I have an ObservableCollection<T> that is a dependency property of a custom control. This collection is being put into a ListView.

The initial binding is working find, and I'm getting the data. However, I'm attempting to sort the data using ObservableCollection.Move(), and when I do that I'm getting this error in Unity:

[noesis] Unimplemented
UnityEngine.Debug:LogError(Object)
NoesisUnity:UnityLog(Int32, String) (at Assets/NoesisGUI/Plugins/NoesisUnity.cs:116)
Noesis.Extend:Noesis_LaunchCollectionChangedEvent(IntPtr, IntPtr, Int32, IntPtr, IntPtr, Int32, Int32)
Noesis.Extend:NotifyCollectionChanged(Object, NotifyCollectionChangedEventArgs) (at Assets/NoesisGUI/Plugins/API/Core/Extend.cs:4359)
System.Collections.ObjectModel.ObservableCollection`1:Move(Int32, Int32)

Am I doing something here that Noesis doesn't support? Should I be sorting the ObservableCollection via a different method that .Move()? If I recreate the ObservableCollection I can get it to work, but then I lose the binding to the viewmodel that allows me to remove/add items.

I can post code if needed, however I'd like to get a sense of whether what I'm trying to do is supported or not. Or if someone has seen this specific error before and might know what I've done wrong. Thanks!

This is not properly implemented. I am not sure how this was not reported before, could you please open a ticket about it?

As a workaround, for now, you can use Sets to sort the collection. Sorry for the inconvenience.

Cool, I just wasn't sure if I was doing something wrong or unsupported.

I found a hack/workaround. It involves tracking the change notification of the ObservableCollection and rebinding ItemsSource anytime anything changes. Probably not great for perf, but it actually seems to work fine.

I will open a ticket. Thanks!

Thanks for the ticket (#1550)