Fixed error caused by null-coalescing assignment operator (?=)

Author: Lemon73-Computing

src/Controls/samples/Controls.Sample/Pages/HitTestingPage.xaml.cs

@@ -138,7 +138,8 @@ private void HandleTapped(double x, double y)
 			SelectionLabel.Text = "Selected: " + string.Join(" <- ", elements!.Select(x => x.GetType().Name));
 			var e = elements!.FirstOrDefault() as Microsoft.Maui.Controls.View;
 
-			e?.BackgroundColor = new Microsoft.Maui.Graphics.Color(255, 0, 0);
+			if (e != null)
+				e.BackgroundColor = new Microsoft.Maui.Graphics.Color(255, 0, 0);
 		}
 
 		// IWindowOverlayElement/IDrawable is implemented to show the rectangle selection lasso

src/Controls/src/Core/BindableLayout/BindableLayout.cs

@@ -118,7 +118,8 @@ static void SetBindableLayoutController(BindableObject b, BindableLayoutControll
 
 		static void OnControllerChanged(BindableObject b, BindableLayoutController oldC, BindableLayoutController newC)
 		{
-			oldC?.ItemsSource = null;
+			if (oldC != null)
+				oldC.ItemsSource = null;
 
 			if (newC == null)
 			{

src/Controls/src/Core/ImageElement.cs

@@ -137,7 +137,8 @@ async static void CancelOldValue(ImageSource oldvalue)
 		static void ImageSourceChanged(BindableObject bindable, ImageSource newSource)
 		{
 			var imageElement = (VisualElement)bindable;
-			newSource?.Parent = imageElement;
+			if (newSource != null)
+				newSource.Parent = imageElement;
 			imageElement?.InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
 		}
 

src/Controls/src/Core/Interactivity/TriggerBase.cs

@@ -96,7 +96,8 @@ internal virtual void OnSeal()
 			((SealedList<TriggerAction>)ExitActions).IsReadOnly = true;
 			if (Setters != null)
 				((SealedList<Setter>)Setters).IsReadOnly = true;
-			Condition?.IsSealed = true;
+			if (Condition != null)
+				Condition.IsSealed = true;
 		}
 
 		void OnConditionChanged(BindableObject bindable, bool oldValue, bool newValue)

src/Controls/src/Core/Internals/EffectUtilities.cs

@@ -15,7 +15,9 @@ public static void RegisterEffectControlProvider(IEffectControlProvider self, IE
 				controller.EffectControlProvider = null;
 
 			controller = newElement;
-			controller?.EffectControlProvider = self;
+
+			if (controller != null)
+				controller.EffectControlProvider = self;
 		}
 
 		/// <include file="../../../docs/Microsoft.Maui.Controls.Internals/EffectUtilities.xml" path="//Member[@MemberName='UnregisterEffectControlProvider']/Docs/*" />

src/Controls/src/Core/ObservableWrapper.cs

@@ -144,11 +144,13 @@ public TRestrict this[int index]
 			set
 			{
 				int innerIndex = ToInnerIndex(index);
-				value?.Owned = true;
+				if (value != null)
+					value.Owned = true;
 				TTrack old = _list[innerIndex];
 				_list[innerIndex] = value;
 
-				old?.Owned = false;
+				if (old != null)
+					old.Owned = false;
 			}
 		}
 

src/Controls/src/Core/SetterSpecificityList.cs

@@ -24,14 +24,16 @@ public void SetValue(SetterSpecificity specificity, object value)
 			if (_first is null || _first.Value.Key == specificity)
 			{
 				_first = new KeyValuePair<SetterSpecificity, object>(specificity, value);
-				_values?[specificity] = value;
+				if (_values != null)
+					_values[specificity] = value;
 				return;
 			}
 
 			if (_second is null || _second.Value.Key == specificity)
 			{
 				_second = new KeyValuePair<SetterSpecificity, object>(specificity, value);
-				_values?[specificity] = value;
+				if (_values != null)
+					_values[specificity] = value;
 				return;
 			}
 

src/Controls/src/Core/StyleSheets/Selector.cs

@@ -116,7 +116,8 @@ static void SetCurrentSelector(ref Selector root, ref Selector workingRoot, ref
 			op.Left = workingRoot;
 			op.Right = sel;
 			workingRoot = op;
-			workingRootParent?.Right = workingRoot;
+			if (workingRootParent != null)
+				workingRootParent.Right = workingRoot;
 
 			if (updateRoot)
 				root = workingRoot;

src/Essentials/src/Accelerometer/AccelerometerQueue.shared.cs

@@ -25,7 +25,8 @@ internal void Add(long timestamp, bool accelerating)
 			added.IsAccelerating = accelerating;
 			added.Next = null;
 
-			newest?.Next = added;
+			if (newest != null)
+				newest.Next = added;
 
 			newest = added;
 

src/Graphics/src/Graphics.Skia/SkiaCanvasState.cs

@@ -168,18 +168,24 @@ public void SetBlur(float radius)
 					_blurRadius = radius;
 					_blurFilter = SKMaskFilter.CreateBlur(SKBlurStyle.Normal, _blurRadius);
 
-					_fillPaint?.MaskFilter = _blurFilter;
-					_strokePaint?.MaskFilter = _blurFilter;
-					_fontPaint?.MaskFilter = _blurFilter;
+					if (_fillPaint != null)
+						_fillPaint.MaskFilter = _blurFilter;
+					if (_strokePaint != null)
+						_strokePaint.MaskFilter = _blurFilter;
+					if (_fontPaint != null)
+						_fontPaint.MaskFilter = _blurFilter;
 				}
 				else
 				{
 					_isBlurred = false;
 					_blurRadius = 0;
 
-					_fillPaint?.MaskFilter = null;
-					_strokePaint?.MaskFilter = null;
-					_fontPaint?.MaskFilter = null;
+					if (_fillPaint != null)
+						_fillPaint.MaskFilter = null;
+					if (_strokePaint != null)
+						_strokePaint.MaskFilter = null;
+					if (_fontPaint != null)
+						_fontPaint.MaskFilter = null;
 				}
 			}
 		}