Clean-up some issues with WeakEventListener Usage, make OnEventAction lambda's static

See https://github.com/CommunityToolkit/WindowsCommunityToolkit/issues/3029#issuecomment-547543581
and https://github.com/MicrosoftDocs/WindowsCommunityToolkitDocs/issues/262#issuecomment-912522699

Microsoft.Toolkit.Uwp.UI.Controls.Core/RotatorTile/RotatorTile.cs

@@ -440,7 +440,7 @@ namespace Microsoft.Toolkit.Uwp.UI.Controls
                     var incc = (INotifyCollectionChanged)newValue;
                     _inccWeakEventListener = new WeakEventListener<RotatorTile, object, NotifyCollectionChangedEventArgs>(this)
                     {
-                        OnEventAction = (instance, source, eventArgs) => instance.Incc_CollectionChanged(source, eventArgs),
+                        OnEventAction = static (instance, source, eventArgs) => instance.Incc_CollectionChanged(source, eventArgs),
                         OnDetachAction = (listener) => incc.CollectionChanged -= listener.OnEvent
                     };
                     incc.CollectionChanged += _inccWeakEventListener.OnEvent;

Microsoft.Toolkit.Uwp.UI.Controls.Input/TokenizingTextBox/InterspersedObservableCollection.cs

@@ -62,7 +62,7 @@ namespace Microsoft.Toolkit.Uwp.UI.Controls
             {
                 var weakPropertyChangedListener = new WeakEventListener<InterspersedObservableCollection, object, NotifyCollectionChangedEventArgs>(this)
                 {
-                    OnEventAction = (instance, source, eventArgs) => instance.ItemsSource_CollectionChanged(source, eventArgs),
+                    OnEventAction = static (instance, source, eventArgs) => instance.ItemsSource_CollectionChanged(source, eventArgs),
                     OnDetachAction = (weakEventListener) => notifier.CollectionChanged -= weakEventListener.OnEvent // Use Local Reference Only
                 };
                 notifier.CollectionChanged += weakPropertyChangedListener.OnEvent;

Microsoft.Toolkit.Uwp.UI/AdvancedCollectionView/AdvancedCollectionView.cs

@@ -97,7 +97,7 @@ namespace Microsoft.Toolkit.Uwp.UI
                         new WeakEventListener<AdvancedCollectionView, object, NotifyCollectionChangedEventArgs>(this)
                         {
                             // Call the actual collection changed event
-                            OnEventAction = (source, changed, arg3) => SourceNcc_CollectionChanged(source, arg3),
+                            OnEventAction = static (instance, source, arg3) => instance.SourceNcc_CollectionChanged(source, arg3),
 
                             // The source doesn't exist anymore
                             OnDetachAction = (listener) => sourceNcc.CollectionChanged -= _sourceWeakEventListener.OnEvent

Microsoft.Toolkit.Uwp.UI/Triggers/FullScreenModeStateTrigger.cs

@@ -23,7 +23,7 @@ namespace Microsoft.Toolkit.Uwp.UI.Triggers
                 var weakEvent =
                     new WeakEventListener<FullScreenModeStateTrigger, ApplicationView, object>(this)
                     {
-                        OnEventAction = (instance, source, eventArgs) => instance.FullScreenModeTrigger_VisibleBoundsChanged(source, eventArgs),
+                        OnEventAction = static (instance, source, eventArgs) => instance.FullScreenModeTrigger_VisibleBoundsChanged(source, eventArgs),
                         OnDetachAction = (weakEventListener) => ApplicationView.GetForCurrentView().VisibleBoundsChanged -= weakEventListener.OnEvent
                     };
                 ApplicationView.GetForCurrentView().VisibleBoundsChanged += weakEvent.OnEvent;

Microsoft.Toolkit.Uwp.UI/Triggers/IsNullOrEmptyStateTrigger.cs

@@ -47,9 +47,9 @@ namespace Microsoft.Toolkit.Uwp.UI.Triggers
             var valNotifyCollection = val as INotifyCollectionChanged;
             if (valNotifyCollection != null)
             {
-                var weakEvent = new WeakEventListener<INotifyCollectionChanged, object, NotifyCollectionChangedEventArgs>(valNotifyCollection)
+                var weakEvent = new WeakEventListener<IsNullOrEmptyStateTrigger, object, NotifyCollectionChangedEventArgs>(obj)
                 {
-                    OnEventAction = (instance, source, args) => obj.SetActive(IsNullOrEmpty(instance)),
+                    OnEventAction = static (instance, source, args) => instance.SetActive(IsNullOrEmpty(source)),
                     OnDetachAction = (weakEventListener) => valNotifyCollection.CollectionChanged -= weakEventListener.OnEvent
                 };
 
@@ -61,9 +61,9 @@ namespace Microsoft.Toolkit.Uwp.UI.Triggers
             var valObservableVector = val as IObservableVector<object>;
             if (valObservableVector != null)
             {
-                var weakEvent = new WeakEventListener<IObservableVector<object>, object, IVectorChangedEventArgs>(valObservableVector)
+                var weakEvent = new WeakEventListener<IsNullOrEmptyStateTrigger, object, IVectorChangedEventArgs>(obj)
                 {
-                    OnEventAction = (instance, source, args) => obj.SetActive(IsNullOrEmpty(instance)),
+                    OnEventAction = static (instance, source, args) => instance.SetActive(IsNullOrEmpty(source)),
                     OnDetachAction = (weakEventListener) => valObservableVector.VectorChanged -= weakEventListener.OnEvent
                 };
 
@@ -75,9 +75,9 @@ namespace Microsoft.Toolkit.Uwp.UI.Triggers
             var valObservableMap = val as IObservableMap<object, object>;
             if (valObservableMap != null)
             {
-                var weakEvent = new WeakEventListener<IObservableMap<object, object>, object, IMapChangedEventArgs<object>>(valObservableMap)
+                var weakEvent = new WeakEventListener<IsNullOrEmptyStateTrigger, object, IMapChangedEventArgs<object>>(obj)
                 {
-                    OnEventAction = (instance, source, args) => obj.SetActive(IsNullOrEmpty(instance)),
+                    OnEventAction = static (instance, source, args) => instance.SetActive(IsNullOrEmpty(source)),
                     OnDetachAction = (weakEventListener) => valObservableMap.MapChanged -= weakEventListener.OnEvent
                 };
 

Microsoft.Toolkit.Uwp.UI/Triggers/NetworkConnectionStateTrigger.cs

@@ -25,7 +25,7 @@ namespace Microsoft.Toolkit.Uwp.UI.Triggers
             var weakEvent =
                 new WeakEventListener<NetworkConnectionStateTrigger, object>(this)
                 {
-                    OnEventAction = (instance, source) => NetworkInformation_NetworkStatusChanged(source),
+                    OnEventAction = static (instance, source) => instance.NetworkInformation_NetworkStatusChanged(source),
                     OnDetachAction = (weakEventListener) => NetworkInformation.NetworkStatusChanged -= weakEventListener.OnEvent
                 };
             NetworkInformation.NetworkStatusChanged += weakEvent.OnEvent;

Microsoft.Toolkit.Uwp.UI/Triggers/UserInteractionModeStateTrigger.cs

@@ -24,7 +24,7 @@ namespace Microsoft.Toolkit.Uwp.UI.Triggers
                 var weakEvent =
                     new WeakEventListener<UserInteractionModeStateTrigger, object, WindowSizeChangedEventArgs>(this)
                     {
-                        OnEventAction = (instance, source, eventArgs) => UserInteractionModeTrigger_SizeChanged(source, eventArgs),
+                        OnEventAction = static (instance, source, eventArgs) => instance.UserInteractionModeTrigger_SizeChanged(source, eventArgs),
                         OnDetachAction = (weakEventListener) => Window.Current.SizeChanged -= weakEventListener.OnEvent
                     };
                 Window.Current.SizeChanged += weakEvent.OnEvent;