Fix triggers

samples/BehaviorsTestApplication/ViewModels/MainWindowViewModel.cs

@@ -74,6 +74,8 @@ public MainWindowViewModel()
         IsLoading = true;
         Progress = 30;
 
+        DataContextChangedCommand = ReactiveCommand.Create(DataContextChanged);
+
         InitializeCommand = ReactiveCommand.Create(Initialize);
 
         MoveLeftCommand = ReactiveCommand.Create(() => Position -= 5.0);
@@ -115,6 +117,8 @@ public MainWindowViewModel()
 
     public IObservable<int> Values { get; }
 
+    public ICommand DataContextChangedCommand { get; set; }
+
     public ICommand InitializeCommand { get; set; }
 
     public ICommand MoveLeftCommand { get; set; }
@@ -133,6 +137,11 @@ public MainWindowViewModel()
 
     public ICommand GetClipboardTextCommand { get; set; }
 
+    private void DataContextChanged()
+    {
+        Console.WriteLine("DataContextChanged");
+    }
+
     private void Initialize()
     {
         Console.WriteLine("InitializeCommand");

samples/BehaviorsTestApplication/Views/MainWindow.axaml

@@ -6,16 +6,23 @@
         Title="XamlBehaviors Test Application" Width="1000" Height="700"
         x:DataType="vm:MainWindowViewModel">
   <Interaction.Behaviors>
+
     <!-- TopLevel Logical tree special case -->
     <!--
     <EventTriggerBehavior EventName="Opened">
       <InvokeCommandAction Command="{Binding InitializeCommand, Mode=OneTime}" />
     </EventTriggerBehavior>
     -->
+
     <!-- TopLevel attached to visual tree special case -->
     <RoutedEventTriggerBehavior RoutedEvent="{x:Static Control.LoadedEvent}">
       <InvokeCommandAction Command="{Binding InitializeCommand, Mode=OneTime}" />
     </RoutedEventTriggerBehavior>
+
+    <DataContextChangedTrigger>
+      <InvokeCommandAction Command="{Binding DataContextChangedCommand}" />
+    </DataContextChangedTrigger>
+
   </Interaction.Behaviors>
   <views:MainView />
 </Window>

src/Avalonia.Xaml.Interactions.Custom/Core/ActualThemeVariantChangedTrigger.cs

@@ -1,3 +1,4 @@
+using Avalonia.Threading;
 using Avalonia.Xaml.Interactivity;
 
 namespace Avalonia.Xaml.Interactions.Custom;
@@ -10,7 +11,10 @@ public class ActualThemeVariantChangedTrigger : StyledElementTrigger<StyledEleme
     /// <inheritdoc />
     protected override void OnActualThemeVariantChangedEvent()
     {
-        Execute(parameter: null);
+        Dispatcher.UIThread.Post(() =>
+        {
+            Execute(parameter: null);
+        });
     }
 
     private void Execute(object? parameter)

src/Avalonia.Xaml.Interactions.Custom/Core/DataContextChangedTrigger.cs

@@ -1,3 +1,4 @@
+using Avalonia.Threading;
 using Avalonia.Xaml.Interactivity;
 
 namespace Avalonia.Xaml.Interactions.Custom;
@@ -10,7 +11,10 @@ public class DataContextChangedTrigger : StyledElementTrigger<StyledElement>
     /// <inheritdoc />
     protected override void OnDataContextChangedEvent()
     {
-        Execute(parameter: null);
+        Dispatcher.UIThread.Post(() =>
+        {
+            Execute(parameter: null);
+        });
     }
 
     private void Execute(object? parameter)

src/Avalonia.Xaml.Interactions.Custom/Core/ResourcesChangedTrigger.cs

@@ -1,3 +1,4 @@
+using Avalonia.Threading;
 using Avalonia.Xaml.Interactivity;
 
 namespace Avalonia.Xaml.Interactions.Custom;
@@ -10,7 +11,10 @@ public class ResourcesChangedTrigger : StyledElementTrigger<StyledElement>
     /// <inheritdoc />
     protected override void OnResourcesChangedEvent()
     {
-        Execute(parameter: null);
+        Dispatcher.UIThread.Post(() =>
+        {
+            Execute(parameter: null);
+        });
     }
 
     private void Execute(object? parameter)