Avalonia.Controls.TreeDataGrid
Avalonia.Controls.TreeDataGrid copied to clipboard
AvaloniaUI
Collection Move not supported
Randomly got this exception. Flat source was used. Shouldn't Move operation be supported as well?
Unhandled exception. System.NotSupportedException: Collection Move not supported.
at Avalonia.Controls.Selection.TreeSelectionNode`1.OnSourceCollectionChanged(NotifyCollectionChangedEventArgs e) in /_/src/Avalonia.Controls.TreeDataGrid/Selection/TreeSelectionNode.cs:line 158
at Avalonia.Controls.Selection.SelectionNodeBase`1.Avalonia.Controls.Utils.ICollectionChangedListener.Changed(INotifyCollectionChanged sender, NotifyCollectionChangedEventArgs e) in /_/src/Avalonia.Controls.TreeDataGrid/Selection/SelectionNodeBase.cs:line 86
at Avalonia.Controls.Utils.CollectionChangedEventManager.<Avalonia.Utilities.IWeakSubscriber<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.OnEvent>g__Notify|7_0(INotifyCollectionChanged incc, NotifyCollectionChangedEventArgs args, List`1 listeners) in /_/src/Avalonia.Controls.TreeDataGrid/Utils/CollectionChangedEventManager.cs:line 100
at Avalonia.Controls.Utils.CollectionChangedEventManager.Avalonia.Utilities.IWeakSubscriber<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.OnEvent(Object sender, NotifyCollectionChangedEventArgs e) in /_/src/Avalonia.Controls.TreeDataGrid/Utils/CollectionChangedEventManager.cs:line 117
at Avalonia.Utilities.WeakSubscriptionManager.Subscription`1.OnEvent(Object sender, T eventArgs) in /_/src/Avalonia.Base/Utilities/WeakSubscriptionManager.cs:line 184
at System.Collections.ObjectModel.ReadOnlyObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Collections.ObjectModel.ReadOnlyObservableCollection`1.HandleCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
at System.Collections.ObjectModel.ObservableCollection`1.MoveItem(Int32 oldIndex, Int32 newIndex)
at System.Collections.ObjectModel.ObservableCollection`1.Move(Int32 oldIndex, Int32 newIndex)
at DynamicData.Binding.ObservableCollectionExtended`1.DynamicData.Binding.IObservableCollection<T>.Move(Int32 oldIndex, Int32 newIndex)
at DynamicData.Binding.SortedObservableCollectionAdaptor`2.DoUpdate(ISortedChangeSet`2 updates, IObservableCollection`1 list) in /_/src/DynamicData/Binding/SortedObservableCollectionAdaptor.cs:line 93
at DynamicData.Binding.SortedObservableCollectionAdaptor`2.Adapt(ISortedChangeSet`2 changes, IObservableCollection`1 collection) in /_/src/DynamicData/Binding/SortedObservableCollectionAdaptor.cs:line 71
at DynamicData.ObservableCacheEx.<>c__DisplayClass27_0`2.<Bind>b__1(ISortedChangeSet`2 changes) in /_/src/DynamicData/Cache/ObservableCacheEx.cs:line 691
at System.Reactive.Linq.ObservableImpl.Select`2.Selector._.OnNext(TSource value) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/Select.cs:line 48
--- End of stack trace from previous location ---
at System.Reactive.PlatformServices.ExceptionServicesImpl.Rethrow(Exception exception) in /_/Rx.NET/Source/src/System.Reactive/Internal/ExceptionServicesImpl.cs:line 19
at System.Reactive.ExceptionHelpers.Throw(Exception exception) in /_/Rx.NET/Source/src/System.Reactive/Internal/ExceptionServices.cs:line 16
at System.Reactive.Stubs.<>c.<.cctor>b__2_1(Exception ex) in /_/Rx.NET/Source/src/System.Reactive/Internal/Stubs.cs:line 16
at System.Reactive.AnonymousObserver`1.OnErrorCore(Exception error) in /_/Rx.NET/Source/src/System.Reactive/AnonymousObserver.cs:line 73
at System.Reactive.ObserverBase`1.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/ObserverBase.cs:line 59
at System.Reactive.AutoDetachObserver`1.OnErrorCore(Exception exception) in /_/Rx.NET/Source/src/System.Reactive/Internal/AutoDetachObserver.cs:line 77
at System.Reactive.ObserverBase`1.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/ObserverBase.cs:line 59
at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 60
at System.Reactive.Linq.ObservableImpl.Select`2.Selector._.OnNext(TSource value) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/Select.cs:line 48
at System.Reactive.Concurrency.Synchronize`1._.OnNext(TSource value) in /_/Rx.NET/Source/src/System.Reactive/Concurrency/Synchronization.Synchronize.cs:line 44
at System.Reactive.ObserveOnObserverNew`1.DrainStep(ConcurrentQueue`1 q) in /_/Rx.NET/Source/src/System.Reactive/Internal/ScheduledObserver.cs:line 559
at System.Reactive.ObserveOnObserverNew`1.DrainShortRunning(IScheduler recursiveScheduler) in /_/Rx.NET/Source/src/System.Reactive/Internal/ScheduledObserver.cs:line 513
at Avalonia.Threading.AvaloniaScheduler.<>c__DisplayClass4_1`1.<Schedule>b__1() in /_/src/Avalonia.Base/Threading/AvaloniaScheduler.cs:line 45
at Avalonia.Threading.JobRunner.RunJobs(Nullable`1 priority) in /_/src/Avalonia.Base/Threading/JobRunner.cs:line 37
at Avalonia.Native.PlatformThreadingInterface.SignaledCallback.Signaled(Int32 priority, Int32 priorityContainsMeaningfulValue) in /_/src/Avalonia.Native/PlatformThreadingInterface.cs:line 39
at Avalonia.Native.Interop.Impl.__MicroComIAvnSignaledCallbackVTable.Signaled(IntPtr this, Int32 priority, Int32 priorityContainsMeaningfulValue) in /_/src/Avalonia.Native/Interop.Generated.cs:line 3796
--- End of stack trace from previous location ---
at Avalonia.Native.PlatformThreadingInterface.RunLoop(CancellationToken cancellationToken) in /_/src/Avalonia.Native/PlatformThreadingInterface.cs:line 90
at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken) in /_/src/Avalonia.Base/Threading/Dispatcher.cs:line 65
at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.Start(String[] args) in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 120
at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime[T](T builder, String[] args, ShutdownMode shutdownMode) in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 209
at Program.Main(String[] args)
I have made two extension methods Sort and AddItem for ObservableCollection and in it I use Move(old index, newindex). And I get the same exception in TreeDataGrid, but not always. After the Move() method works, notification occurs in the TreeDataGrid, as I understand it. And something is going wrong(:
public static class ObservableCollectionExt
{
public static void Sort<T>(this ObservableCollection<T> collection) where T : IComparable
{
List<T> sorted = collection.OrderBy(x => x).ToList();
for (int i = 0; i < sorted.Count(); i++)
{
collection.Move(collection.IndexOf(sorted[i]), i);
}
}
public static void AddItem<T>(this ObservableCollection<T> collection, T item) where T : IComparable
{
collection.Add(item);
var oldIndex = collection.IndexOf(item);
List<T> sorted = collection.OrderBy(x => x).ToList();
var newIndex = sorted.IndexOf(item);
collection.Move(oldIndex, newIndex);
}
}
And something is going wrong
It's just as simple. Move operation is not supported in this control. You need to use Remove and Insert instead.