[Trimming] Use new feature switch definition attribute and enable analyzers in Controls.Core.csproj

src/Compatibility/Core/src/Android/AppCompat/FormsAppCompatActivity.cs

@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Threading;
 using Android.App;
@@ -104,7 +105,7 @@ public void SetStatusBarColor(AColor color)
 			Window.SetStatusBarColor(color);
 		}
 
-		static void RegisterHandler(Type target, Type handler, Type filter)
+		static void RegisterHandler(Type target, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] Type handler, Type filter)
 		{
 			Profile.FrameBegin();
 
@@ -459,7 +460,7 @@ void OnStateChanged()
 		}
 
 		// This is currently being used by the previewer please do not change or remove this
-		void RegisterHandlerForDefaultRenderer(Type target, Type handler, Type filter)
+		void RegisterHandlerForDefaultRenderer(Type target, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] Type handler, Type filter)
 		{
 			RegisterHandler(target, handler, filter);
 		}

src/Compatibility/Core/src/Android/Extensions/NativeBindingExtensions.cs

@@ -1,11 +1,13 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.Maui.Controls.Internals;
 
 namespace Microsoft.Maui.Controls.Compatibility.Platform.Android
 {
 	public static class NativeBindingExtensions
 	{
+		[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 		public static void SetBinding(this global::Android.Views.View view, string propertyName, BindingBase binding, string updateSourceEventName = null)
 		{
 			PlatformBindingHelpers.SetBinding(view, propertyName, binding, updateSourceEventName);

src/Compatibility/Core/src/Android/NativeBindingservice.cs

@@ -9,7 +9,7 @@ namespace Microsoft.Maui.Controls.Compatibility.Platform.Android
 {
 	class NativeBindingService : INativeBindingService
 	{
-		[UnconditionalSuppressMessage("Trimming", "IL2075", Justification = TrimmerConstants.NativeBindingService)]
+		[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 		public bool TrySetBinding(object target, string propertyName, BindingBase binding)
 		{
 			var view = target as AView;

src/Compatibility/Core/src/Android/Renderers/ListViewAdapter.cs

@@ -736,7 +736,9 @@ Cell GetNewGroupHeaderCell(ITemplatedItemsList<Cell> group)
 			else
 			{
 				groupHeaderCell = new TextCell();
-				groupHeaderCell.SetBinding(TextCell.TextProperty, nameof(group.Name));
+				groupHeaderCell.SetBinding(
+					TextCell.TextProperty,
+					TypedBinding.ForSingleNestingLevel(nameof(group.Name), static (ITemplatedItemsList<Cell> g) => g.Name));
 				groupHeaderCell.BindingContext = group;
 			}
 

src/Compatibility/Core/src/ExportRendererAttribute.cs

@@ -1,31 +1,32 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
 
 namespace Microsoft.Maui.Controls.Compatibility
 {
 	[AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
 	public sealed class ExportRendererAttribute : HandlerAttribute
 	{
-		public ExportRendererAttribute(Type handler, Type target) : this(handler, target, null)
+		public ExportRendererAttribute(Type handler, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] Type target) : this(handler, target, null)
 		{
 		}
 
-		public ExportRendererAttribute(Type handler, Type target, Type[] supportedVisuals) : base(handler, target, supportedVisuals)
+		public ExportRendererAttribute(Type handler, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] Type target, Type[] supportedVisuals) : base(handler, target, supportedVisuals)
 		{
 		}
 	}
 
 	[AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
 	public sealed class ExportCellAttribute : HandlerAttribute
 	{
-		public ExportCellAttribute(Type handler, Type target) : base(handler, target)
+		public ExportCellAttribute(Type handler, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] Type target) : base(handler, target)
 		{
 		}
 	}
 
 	[AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
 	public sealed class ExportImageSourceHandlerAttribute : HandlerAttribute
 	{
-		public ExportImageSourceHandlerAttribute(Type handler, Type target) : base(handler, target)
+		public ExportImageSourceHandlerAttribute(Type handler, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] Type target) : base(handler, target)
 		{
 		}
 	}

src/Compatibility/Core/src/MauiHandlersCollectionExtensions.cs

@@ -1,12 +1,13 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.Maui.Controls.Hosting;
 using Microsoft.Maui.Hosting;
 
 namespace Microsoft.Maui.Controls.Compatibility.Hosting
 {
 	public static class MauiHandlersCollectionExtensions
 	{
-		public static IMauiHandlersCollection TryAddCompatibilityRenderer(this IMauiHandlersCollection handlersCollection, Type controlType, Type rendererType)
+		public static IMauiHandlersCollection TryAddCompatibilityRenderer(this IMauiHandlersCollection handlersCollection, Type controlType, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] Type rendererType)
 		{
 			Internals.Registrar.CheckIfRendererIsCompatibilityRenderer(rendererType);
 			Hosting.MauiAppBuilderExtensions.CheckForCompatibility();
@@ -21,7 +22,7 @@ public static IMauiHandlersCollection TryAddCompatibilityRenderer(this IMauiHand
 			return handlersCollection;
 		}
 
-		public static IMauiHandlersCollection AddCompatibilityRenderer(this IMauiHandlersCollection handlersCollection, Type controlType, Type rendererType)
+		public static IMauiHandlersCollection AddCompatibilityRenderer(this IMauiHandlersCollection handlersCollection, Type controlType, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] Type rendererType)
 		{
 			Internals.Registrar.CheckIfRendererIsCompatibilityRenderer(rendererType);
 			Hosting.MauiAppBuilderExtensions.CheckForCompatibility();
@@ -36,7 +37,7 @@ public static IMauiHandlersCollection AddCompatibilityRenderer(this IMauiHandler
 			return handlersCollection;
 		}
 
-		public static IMauiHandlersCollection AddCompatibilityRenderer<TControlType, TMauiType, TRenderer>(this IMauiHandlersCollection handlersCollection)
+		public static IMauiHandlersCollection AddCompatibilityRenderer<TControlType, TMauiType, [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] TRenderer>(this IMauiHandlersCollection handlersCollection)
 			where TMauiType : IView
 		{
 			Internals.Registrar.CheckIfRendererIsCompatibilityRenderer(typeof(TRenderer));
@@ -51,7 +52,7 @@ public static IMauiHandlersCollection AddCompatibilityRenderer<TControlType, TMa
 			return handlersCollection;
 		}
 
-		public static IMauiHandlersCollection AddCompatibilityRenderer<TControlType, TRenderer>(this IMauiHandlersCollection handlersCollection)
+		public static IMauiHandlersCollection AddCompatibilityRenderer<TControlType,  [DynamicallyAccessedMembers(Internals.HandlerType.TargetMembers)] TRenderer>(this IMauiHandlersCollection handlersCollection)
 			where TControlType : IView
 		{
 			Internals.Registrar.CheckIfRendererIsCompatibilityRenderer(typeof(TRenderer));

src/Compatibility/Core/src/Tizen/Extensions/NativeBindingExtensions.cs

@@ -1,12 +1,14 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.Maui.Controls.Internals;
 using NView = Tizen.NUI.BaseComponents.View;
 
 namespace Microsoft.Maui.Controls.Compatibility.Platform.Tizen
 {
 	public static class NativeBindingExtensions
 	{
+		[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 		public static void SetBinding(this NView view, string propertyName, BindingBase binding, string updateSourceEventName = null)
 		{
 			PlatformBindingHelpers.SetBinding(view, propertyName, binding, updateSourceEventName);

src/Compatibility/Core/src/Tizen/NativeBindingService.cs

@@ -7,7 +7,7 @@ namespace Microsoft.Maui.Controls.Compatibility.Platform.Tizen
 {
 	class NativeBindingService : INativeBindingService
 	{
-		[UnconditionalSuppressMessage("Trimming", "IL2075", Justification = TrimmerConstants.NativeBindingService)]
+		[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 		public bool TrySetBinding(object target, string propertyName, BindingBase binding)
 		{
 			Hosting.MauiAppBuilderExtensions.CheckForCompatibility();

src/Compatibility/Core/src/Windows/NativeBindingExtensions.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.Maui.Controls.Internals;
 using Microsoft.UI.Xaml;
 using static System.String;
@@ -9,6 +10,7 @@ namespace Microsoft.Maui.Controls.Compatibility.Platform.UWP
 {
 	public static class NativeBindingExtensions
 	{
+		[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 		public static void SetBinding(this FrameworkElement view, string propertyName, BindingBase bindingBase, string updateSourceEventName = null)
 		{
 			var binding = bindingBase as Binding;

src/Compatibility/Core/src/Windows/NativeBindingService.cs

@@ -9,7 +9,7 @@ namespace Microsoft.Maui.Controls.Compatibility.Platform.UWP
 {
 	public class NativeBindingService : INativeBindingService
 	{
-		[UnconditionalSuppressMessage("Trimming", "IL2075", Justification = TrimmerConstants.NativeBindingService)]
+		[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 		public bool TrySetBinding(object target, string propertyName, BindingBase binding)
 		{
 			var view = target as FrameworkElement;

src/Compatibility/Core/src/iOS/NativeBindingService.cs

@@ -11,7 +11,7 @@ namespace Microsoft.Maui.Controls.Compatibility.Platform.iOS
 	[Preserve(AllMembers = true)]
 	class NativeBindingService : INativeBindingService
 	{
-		[UnconditionalSuppressMessage("Trimming", "IL2075", Justification = TrimmerConstants.NativeBindingService)]
+		[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 		public bool TrySetBinding(object target, string propertyName, BindingBase binding)
 		{
 			Hosting.MauiAppBuilderExtensions.CheckForCompatibility();

src/Controls/src/Core/AppThemeBinding.cs

@@ -107,7 +107,7 @@ void Set()
 					target.SetDynamicResource(_targetProperty, dynamicResource.Key, specificity);
 				else
 				{
-					if (!BindingExpression.TryConvert(ref value, _targetProperty, _targetProperty.ReturnType, true))
+					if (!BindingExpressionHelper.TryConvert(ref value, _targetProperty, _targetProperty.ReturnType, true))
 					{
 						BindingDiagnostics.SendBindingFailure(this, null, target, _targetProperty, "AppThemeBinding", BindingExpression.CannotConvertTypeErrorMessage, value, _targetProperty.ReturnType);
 						return;

src/Controls/src/Core/BindableObjectExtensions.cs

@@ -1,6 +1,7 @@
 #nullable disable
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using Microsoft.Maui.Graphics;
 
@@ -48,6 +49,7 @@ internal static void PropagateBindingContext<T>(this BindableObject self, IEnume
 		}
 
 		/// <include file="../../docs/Microsoft.Maui.Controls/BindableObjectExtensions.xml" path="//Member[@MemberName='SetBinding']/Docs/*" />
+		[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 		public static void SetBinding(this BindableObject self, BindableProperty targetProperty, string path, BindingMode mode = BindingMode.Default, IValueConverter converter = null,
 									  string stringFormat = null)
 		{

src/Controls/src/Core/Binding.cs

@@ -1,14 +1,13 @@
 #nullable disable
 using System;
-using System.Collections.Generic;
 using System.ComponentModel;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
-using System.Reflection;
 
 namespace Microsoft.Maui.Controls
 {
 	/// <include file="../../docs/Microsoft.Maui.Controls/Binding.xml" path="Type[@FullName='Microsoft.Maui.Controls.Binding']/Docs/*" />
+	[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 	public sealed class Binding : BindingBase
 	{
 		public const string SelfPath = ".";
@@ -92,7 +91,7 @@ public object Source
 		}
 
 		/// <include file="../../docs/Microsoft.Maui.Controls/Binding.xml" path="//Member[@MemberName='DoNothing']/Docs/*" />
-		public static readonly object DoNothing = new object();
+		public static readonly object DoNothing = MultiBinding.DoNothing; // the instance was moved to MultiBinding because the Binding class is annotated with [RequiresUnreferencedCode]
 
 		/// <include file="../../docs/Microsoft.Maui.Controls/Binding.xml" path="//Member[@MemberName='UpdateSourceEventName']/Docs/*" />
 		[EditorBrowsable(EditorBrowsableState.Never)]

src/Controls/src/Core/BindingExpression.cs

@@ -3,6 +3,7 @@
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Linq;
 using System.Reflection;
@@ -12,6 +13,7 @@
 
 namespace Microsoft.Maui.Controls
 {
+	[RequiresUnreferencedCode(TrimmerConstants.StringPathBindingWarning, Url = TrimmerConstants.ExpressionBasedBindingsDocsUrl)]
 	internal sealed class BindingExpression
 	{
 		internal const string PropertyNotFoundErrorMessage = "'{0}' property not found on '{1}', target property: '{2}.{3}'";
@@ -154,7 +156,7 @@ void ApplyCore(object sourceObject, BindableObject target, BindableProperty prop
 				else
 					value = Binding.FallbackValue ?? property.GetDefaultValue(target);
 
-				if (!TryConvert(ref value, property, property.ReturnType, true))
+				if (!BindingExpressionHelper.TryConvert(ref value, property, property.ReturnType, true))
 				{
 					BindingDiagnostics.SendBindingFailure(Binding, current, target, property, "Binding", CannotConvertTypeErrorMessage, value, property.ReturnType);
 					return;
@@ -166,7 +168,7 @@ void ApplyCore(object sourceObject, BindableObject target, BindableProperty prop
 			{
 				object value = Binding.GetTargetValue(target.GetValue(property), part.SetterType);
 
-				if (!TryConvert(ref value, property, part.SetterType, false))
+				if (!BindingExpressionHelper.TryConvert(ref value, property, part.SetterType, false))
 				{
 					BindingDiagnostics.SendBindingFailure(Binding, current, target, property, "Binding", CannotConvertTypeErrorMessage, value, part.SetterType);
 					return;
@@ -428,54 +430,6 @@ void SetupPart(TypeInfo sourceType, BindingExpressionPart part)
 			}
 		}
 
-		static readonly Type[] DecimalTypes = { typeof(float), typeof(decimal), typeof(double) };
-
-		internal static bool TryConvert(ref object value, BindableProperty targetProperty, Type convertTo, bool toTarget)
-		{
-			if (value == null)
-				return !convertTo.GetTypeInfo().IsValueType || Nullable.GetUnderlyingType(convertTo) != null;
-			try
-			{
-				if ((toTarget && targetProperty.TryConvert(ref value)) || (!toTarget && convertTo.IsInstanceOfType(value)))
-					return true;
-			}
-			catch (InvalidOperationException)
-			{ //that's what TypeConverters ususally throw
-				return false;
-			}
-
-			object original = value;
-			try
-			{
-				convertTo = Nullable.GetUnderlyingType(convertTo) ?? convertTo;
-
-				var stringValue = value as string ?? string.Empty;
-				// see: https://bugzilla.xamarin.com/show_bug.cgi?id=32871
-				// do not canonicalize "*.[.]"; "1." should not update bound BindableProperty
-				if (stringValue.EndsWith(CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator, StringComparison.Ordinal) && DecimalTypes.Contains(convertTo))
-				{
-					value = original;
-					return false;
-				}
-
-				// do not canonicalize "-0"; user will likely enter a period after "-0"
-				if (stringValue == "-0" && DecimalTypes.Contains(convertTo))
-				{
-					value = original;
-					return false;
-				}
-
-				value = Convert.ChangeType(value, convertTo, CultureInfo.CurrentCulture);
-
-				return true;
-			}
-			catch (Exception ex) when (ex is InvalidCastException || ex is FormatException || ex is InvalidOperationException || ex is OverflowException)
-			{
-				value = original;
-				return false;
-			}
-		}
-
 		// SubscribeToAncestryChanges, ClearAncestryChangeSubscriptions, FindAncestryIndex, and
 		// OnElementParentSet are used with RelativeSource ancestor-type bindings, to detect when
 		// there has been an ancestry change requiring re-applying the binding, and to minimize

src/Controls/src/Core/BindingExpressionHelper.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Reflection;
+
+namespace Microsoft.Maui.Controls
+{
+	internal static class BindingExpressionHelper
+	{
+		static readonly Type[] DecimalTypes = { typeof(float), typeof(decimal), typeof(double) };
+
+		internal static bool TryConvert(ref object value, BindableProperty targetProperty, Type convertTo, bool toTarget)
+		{
+			if (value == null)
+				return !convertTo.GetTypeInfo().IsValueType || Nullable.GetUnderlyingType(convertTo) != null;
+			try
+			{
+				if ((toTarget && targetProperty.TryConvert(ref value)) || (!toTarget && convertTo.IsInstanceOfType(value)))
+					return true;
+			}
+			catch (InvalidOperationException)
+			{ //that's what TypeConverters ususally throw
+				return false;
+			}
+
+			object original = value;
+			try
+			{
+				convertTo = Nullable.GetUnderlyingType(convertTo) ?? convertTo;
+
+				var stringValue = value as string ?? string.Empty;
+				// see: https://bugzilla.xamarin.com/show_bug.cgi?id=32871
+				// do not canonicalize "*.[.]"; "1." should not update bound BindableProperty
+				if (stringValue.EndsWith(CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator, StringComparison.Ordinal) && DecimalTypes.Contains(convertTo))
+				{
+					value = original;
+					return false;
+				}
+
+				// do not canonicalize "-0"; user will likely enter a period after "-0"
+				if (stringValue == "-0" && DecimalTypes.Contains(convertTo))
+				{
+					value = original;
+					return false;
+				}
+
+				value = Convert.ChangeType(value, convertTo, CultureInfo.CurrentCulture);
+
+				return true;
+			}
+			catch (Exception ex) when (ex is InvalidCastException || ex is FormatException || ex is InvalidOperationException || ex is OverflowException)
+			{
+				value = original;
+				return false;
+			}
+		}
+	}
+}