fix CA1854

src/Controls/src/Build.Tasks/CompiledConverters/FontSizeTypeConverter.cs

@@ -28,9 +28,9 @@ public IEnumerable<Instruction> ConvertFromString(string value, ILContext contex
 					//Device.GetNamedSize(namedSize, targetObject.GetType())
 					yield return Instruction.Create(OpCodes.Ldc_I4, (int)namedSize);
 					var parent = node.Parent as IElementNode;
-					if (parent != null && context.Variables.ContainsKey(parent))
+					if (parent != null && context.Variables.TryGetValue(parent, out VariableDefinition parentValue))
 					{
-						yield return Instruction.Create(OpCodes.Ldloc, context.Variables[parent]);
+						yield return Instruction.Create(OpCodes.Ldloc, parentValue);
 						yield return Instruction.Create(OpCodes.Callvirt, module.ImportMethodReference(
 							context.Cache,
 							module.TypeSystem.Object,

src/Controls/src/Build.Tasks/CreateObjectVisitor.cs

@@ -96,8 +96,9 @@ public void Visit(ElementNode node, INode parentNode)
 			MethodDefinition factoryMethodInfo = null;
 			MethodDefinition parameterizedCtorInfo = null;
 			MethodDefinition ctorInfo = null;
-
-			if (node.Properties.ContainsKey(XmlName.xArguments) && !node.Properties.ContainsKey(XmlName.xFactoryMethod))
+
+			INode factoryMethodNode = null;
+			if (node.Properties.ContainsKey(XmlName.xArguments) && !node.Properties.TryGetValue(XmlName.xFactoryMethod, out factoryMethodNode))
 			{
 				factoryCtorInfo = typedef.AllMethods(Context.Cache).FirstOrDefault(md => md.methodDef.IsConstructor &&
 																			!md.methodDef.IsStatic &&
@@ -107,9 +108,9 @@ public void Visit(ElementNode node, INode parentNode)
 				if (!typedef.IsValueType) //for ctor'ing typedefs, we first have to ldloca before the params
 					Context.IL.Append(PushCtorXArguments(factoryCtorInfo.ResolveGenericParameters(typeref, Module), node));
 			}
-			else if (node.Properties.ContainsKey(XmlName.xFactoryMethod))
+			else if (factoryMethodNode != null)
 			{
-				var factoryMethod = (string)(node.Properties[XmlName.xFactoryMethod] as ValueNode).Value;
+				var factoryMethod = (string)(factoryMethodNode as ValueNode).Value;
 				factoryMethodInfo = typedef.AllMethods(Context.Cache).FirstOrDefault(md => !md.methodDef.IsConstructor &&
 																			  md.methodDef.Name == factoryMethod &&
 																			  md.methodDef.IsStatic &&
@@ -317,14 +318,14 @@ IEnumerable<Instruction> PushCtorArguments(MethodReference ctorinfo, ElementNode
 
 		IEnumerable<Instruction> PushCtorXArguments(MethodReference factoryCtorInfo, ElementNode enode)
 		{
-			if (!enode.Properties.ContainsKey(XmlName.xArguments))
+			if (!enode.Properties.TryGetValue(XmlName.xArguments, out INode value))
 				yield break;
 
 			var arguments = new List<INode>();
-			var node = enode.Properties[XmlName.xArguments] as ElementNode;
+			var node = value as ElementNode;
 			if (node != null)
 				arguments.Add(node);
-			var list = enode.Properties[XmlName.xArguments] as ListNode;
+			var list = value as ListNode;
 			if (list != null)
 			{
 				foreach (var n in list.CollectionItems)

src/Controls/src/Build.Tasks/MethodDefinitionExtensions.cs

@@ -8,15 +8,15 @@ static class MethodDefinitionExtensions
 	{
 		public static bool MatchXArguments(this MethodDefinition methodDef, ElementNode enode, TypeReference declaringTypeRef, ModuleDefinition module, ILContext context)
 		{
-			if (!enode.Properties.ContainsKey(XmlName.xArguments))
+			if (!enode.Properties.TryGetValue(XmlName.xArguments, out INode value))
 				return !methodDef.HasParameters;
 
 			var arguments = new List<INode>();
-			var node = enode.Properties[XmlName.xArguments] as ElementNode;
+			var node = value as ElementNode;
 			if (node != null)
 				arguments.Add(node);
 
-			var list = enode.Properties[XmlName.xArguments] as ListNode;
+			var list = value as ListNode;
 			if (list != null)
 				foreach (var n in list.CollectionItems)
 					arguments.Add(n);

src/Controls/src/Build.Tasks/SetPropertiesVisitor.cs

@@ -1499,9 +1499,9 @@ static bool CanAddToResourceDictionary(VariableDefinition parent, TypeReference
 				&& !collectionType.InheritsFromOrImplements(context.Cache, context.Module.ImportReference(context.Cache, ("Microsoft.Maui.Controls", "Microsoft.Maui.Controls", "ResourceDictionary"))))
 				return false;
 
-			if (node.Properties.ContainsKey(XmlName.xKey))
+			if (node.Properties.TryGetValue(XmlName.xKey, out INode nodePropertyValue))
 			{
-				var valueNode = node.Properties[XmlName.xKey] as ValueNode ?? throw new BuildException(XKeyNotLiteral, lineInfo, null);
+				var valueNode = nodePropertyValue as ValueNode ?? throw new BuildException(XKeyNotLiteral, lineInfo, null);
 				var key = (valueNode).Value as string;
 				var names = context.Cache.GetResourceNamesInUse(parent);
 				if (names.Contains(key))
@@ -1552,10 +1552,10 @@ static IEnumerable<Instruction> AddToResourceDictionary(VariableDefinition paren
 		{
 			var module = context.Body.Method.Module;
 
-			if (node.Properties.ContainsKey(XmlName.xKey))
+			if (node.Properties.TryGetValue(XmlName.xKey, out INode nodePropertyValue))
 			{
 				var names = context.Cache.GetResourceNamesInUse(parent);
-				var valueNode = node.Properties[XmlName.xKey] as ValueNode ?? throw new BuildException(XKeyNotLiteral, lineInfo, null);
+				var valueNode = nodePropertyValue as ValueNode ?? throw new BuildException(XKeyNotLiteral, lineInfo, null);
 				var key = (valueNode).Value as string;
 				names.Add(key);
 

src/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellSectionRootRenderer.cs

@@ -350,10 +350,9 @@ protected virtual void OnShellSectionPropertyChanged(object sender, PropertyChan
 				_currentContent = newContent;
 				_currentIndex = newIndex;
 
-				if (!_renderers.ContainsKey(newContent))
+				if (!_renderers.TryGetValue(newContent, out var currentRenderer))
 					return;
 
-				var currentRenderer = _renderers[newContent];
 				_isAnimatingOut = oldRenderer;
 				_pageAnimation?.StopAnimation(true);
 				_pageAnimation = null;

src/Controls/src/Core/Internals/NameScope.cs

@@ -52,10 +52,10 @@ void INameScope.UnregisterName(string name)
 			if (name == "")
 				throw new ArgumentException("name was provided as empty string.", nameof(name));
 
-			if (!_names.ContainsKey(name))
+			if (!_names.TryGetValue(name, out var nameValue))
 				throw new ArgumentException("name provided had not been registered.", nameof(name));
 
-			_values.Remove(_names[name]);
+			_values.Remove(nameValue);
 			_names.Remove(name);
 		}
 	}

src/Controls/src/Core/MessagingCenter.cs

@@ -202,9 +202,9 @@ void InnerSend(string message, Type senderType, Type argType, object sender, obj
 			if (message == null)
 				throw new ArgumentNullException(nameof(message));
 			var key = new Sender(message, senderType, argType);
-			if (!_subscriptions.ContainsKey(key))
+			if (!_subscriptions.TryGetValue(key, out List<Subscription> subcriptions))
 				return;
-			List<Subscription> subcriptions = _subscriptions[key];
+
 			if (subcriptions == null || !subcriptions.Any())
 				return; // should not be reachable
 
@@ -229,9 +229,9 @@ void InnerSubscribe(object subscriber, string message, Type senderType, Type arg
 				throw new ArgumentNullException(nameof(message));
 			var key = new Sender(message, senderType, argType);
 			var value = new Subscription(subscriber, target, methodInfo, filter);
-			if (_subscriptions.ContainsKey(key))
+			if (_subscriptions.TryGetValue(key, out List<Subscription> subscriptions))
 			{
-				_subscriptions[key].Add(value);
+				subscriptions.Add(value);
 			}
 			else
 			{
@@ -248,10 +248,10 @@ void InnerUnsubscribe(string message, Type senderType, Type argType, object subs
 				throw new ArgumentNullException(nameof(message));
 
 			var key = new Sender(message, senderType, argType);
-			if (!_subscriptions.ContainsKey(key))
+			if (!_subscriptions.TryGetValue(key, out List<Subscription> subscriptions))
 				return;
-			_subscriptions[key].RemoveAll(sub => sub.CanBeRemoved() || sub.Subscriber.Target == subscriber);
-			if (!_subscriptions[key].Any())
+			subscriptions.RemoveAll(sub => sub.CanBeRemoved() || sub.Subscriber.Target == subscriber);
+			if (!subscriptions.Any())
 				_subscriptions.Remove(key);
 		}
 

src/Controls/src/Core/ResourceDictionary.cs

@@ -190,10 +190,10 @@ public bool ContainsKey(string key)
 		{
 			get
 			{
-				if (_innerDictionary.ContainsKey(index))
-					return _innerDictionary[index];
-				if (_mergedInstance != null && _mergedInstance.ContainsKey(index))
-					return _mergedInstance[index];
+				if (_innerDictionary.TryGetValue(index, out var innerValue))
+					return innerValue;
+				if (_mergedInstance != null && _mergedInstance.TryGetValue(index, out var mergedValue))
+					return mergedValue;
 				if (_mergedDictionaries != null)
 				{
 					var dictionaries = (ObservableCollection<ResourceDictionary>)MergedDictionaries;

src/Controls/src/Core/ResourcesExtensions.cs

@@ -35,11 +35,11 @@ static class ResourcesExtensions
 				{
 					resources = resources ?? new Dictionary<string, object>(8, StringComparer.Ordinal);
 					foreach (KeyValuePair<string, object> res in app.SystemResources)
-						if (!resources.ContainsKey(res.Key))
+						if (!resources.TryGetValue(res.Key, out var resourceValue))
 							resources.Add(res.Key, res.Value);
 						else if (res.Key.StartsWith(Style.StyleClassPrefix, StringComparison.Ordinal))
 						{
-							var mergedClassStyles = new List<Style>(resources[res.Key] as List<Style>);
+							var mergedClassStyles = new List<Style>(resourceValue as List<Style>);
 							mergedClassStyles.AddRange(res.Value as List<Style>);
 							resources[res.Key] = mergedClassStyles;
 						}

src/Controls/src/Xaml/ApplyPropertiesVisitor.cs

@@ -130,9 +130,9 @@ public void Visit(ElementNode node, INode parentNode)
 
 				string xKey = null;
 				if (xpe == null
-					&& node.Properties.ContainsKey(XmlName.xKey))
+					&& node.Properties.TryGetValue(XmlName.xKey, out INode nodePropertyValue))
 				{
-					if ((node.Properties[XmlName.xKey] is ValueNode valueNode))
+					if (nodePropertyValue is ValueNode valueNode)
 						xKey = valueNode.Value as string;
 					if (xKey == null)
 						xpe = new XamlParseException("x:Key expects a string literal.", node as IXmlLineInfo);
@@ -192,9 +192,9 @@ public void Visit(ElementNode node, INode parentNode)
 					return;
 				Exception xpe = null;
 				string xKey = null;
-				if (xpe == null && node.Properties.ContainsKey(XmlName.xKey))
+				if (xpe == null && node.Properties.TryGetValue(XmlName.xKey, out INode nodePropertyValue))
 				{
-					if ((node.Properties[XmlName.xKey] is ValueNode valueNode))
+					if (nodePropertyValue is ValueNode valueNode)
 						xKey = valueNode.Value as string;
 					if (xKey == null)
 						xpe = new XamlParseException("x:Key expects a string literal.", node as IXmlLineInfo);
@@ -357,7 +357,7 @@ static object GetTargetProperty(object xamlelement, XmlName propertyName, object
 		public static void SetPropertyValue(object xamlelement, XmlName propertyName, object value, object rootElement, INode node, HydrationContext context, IXmlLineInfo lineInfo)
 		{
 			var serviceProvider = new XamlServiceProvider(node, context);
-			var xKey = node is IElementNode eNode && eNode.Properties.ContainsKey(XmlName.xKey) ? ((ValueNode)eNode.Properties[XmlName.xKey]).Value as string : null;
+			var xKey = node is IElementNode eNode && eNode.Properties.TryGetValue(XmlName.xKey, out INode nodePropertyValue) ? ((ValueNode)nodePropertyValue).Value as string : null;
 
 			if (TrySetPropertyValue(xamlelement, propertyName, xKey, value, rootElement, lineInfo, serviceProvider, out var xpe))
 				return;

src/Controls/src/Xaml/CreateValuesVisitor.cs

@@ -226,13 +226,13 @@ public object CreateFromFactory(Type nodeType, IElementNode node)
 		{
 			object[] arguments = CreateArgumentsArray(node);
 
-			if (!node.Properties.ContainsKey(XmlName.xFactoryMethod))
+			if (!node.Properties.TryGetValue(XmlName.xFactoryMethod, out INode nodePropertyValue))
 			{
 				//non-default ctor
 				return Activator.CreateInstance(nodeType, arguments);
 			}
 
-			var factoryMethod = ((string)((ValueNode)node.Properties[XmlName.xFactoryMethod]).Value);
+			var factoryMethod = (string)((ValueNode)nodePropertyValue).Value;
 			Type[] types = arguments == null ? Array.Empty<Type>() : arguments.Select(a => a.GetType()).ToArray();
 
 			bool isMatch(MethodInfo m)
@@ -266,9 +266,9 @@ bool isMatch(MethodInfo m)
 
 		public object[] CreateArgumentsArray(IElementNode enode)
 		{
-			if (!enode.Properties.ContainsKey(XmlName.xArguments))
+			if (!enode.Properties.TryGetValue(XmlName.xArguments, out INode node))
 				return null;
-			var node = enode.Properties[XmlName.xArguments];
+
 			if (node is ElementNode elementNode)
 			{
 				var array = new object[1];

src/Controls/src/Xaml/SimplifyTypeExtensionVisitor.cs

@@ -59,8 +59,8 @@ static bool IsTypeExtension(ElementNode node, out ValueNode typeNameValueNode)
 
 				if (node.XmlType.Name == nameof(TypeExtension)
 					&& node.XmlType.NamespaceUri == XamlParser.X2009Uri
-					&& node.Properties.ContainsKey(typeNameXmlName)
-					&& node.Properties[typeNameXmlName] is ValueNode valueNode
+					&& node.Properties.TryGetValue(typeNameXmlName, out INode nodePropertyValue)
+					&& nodePropertyValue is ValueNode valueNode
 					&& valueNode.Value is string)
 				{
 					typeNameValueNode = valueNode;

src/Controls/tests/Core.UnitTests/DependencyResolutionTests.cs

@@ -74,14 +74,14 @@ public void Register(Type type, Func<object, object> factory)
 
 			public object Resolve(Type type, params object[] args)
 			{
-				if (_services.ContainsKey(type))
+				if (_services.TryGetValue(type, out var service))
 				{
-					return _services[type];
+					return service;
 				}
 
-				if (_factories.ContainsKey(type))
+				if (_factories.TryGetValue(type, out Func<object, object> factory))
 				{
-					return _factories[type].Invoke(args[0]);
+					return factory.Invoke(args[0]);
 				}
 
 				return null;

src/Core/src/Platform/Android/LocalizedDigitsKeyListener.cs

@@ -78,12 +78,13 @@ static LocalizedDigitsKeyListener GetInstance(InputTypes inputTypes, char decima
 				cache = new Dictionary<char, LocalizedDigitsKeyListener>(1);
 			}
 
-			if (!cache.ContainsKey(decimalSeparator))
+			if (!cache.TryGetValue(decimalSeparator, out LocalizedDigitsKeyListener? listener))
 			{
-				cache.Add(decimalSeparator, new LocalizedDigitsKeyListener(inputTypes, decimalSeparator));
+				listener = new LocalizedDigitsKeyListener(inputTypes, decimalSeparator);
+				cache.Add(decimalSeparator, listener);
 			}
 
-			return cache[decimalSeparator];
+			return listener;
 		}
 
 		protected LocalizedDigitsKeyListener(InputTypes inputTypes, char decimalSeparator)

src/Essentials/src/Permissions/Permissions.android.cs

@@ -176,10 +176,10 @@ internal static void OnRequestPermissionsResult(int requestCode, string[] permis
 			{
 				lock (locker)
 				{
-					if (requests.ContainsKey(requestCode))
+					if (requests.TryGetValue(requestCode, out var requestResult))
 					{
 						var result = new PermissionResult(permissions, grantResults);
-						requests[requestCode].TrySetResult(result);
+						requestResult.TrySetResult(result);
 						requests.Remove(requestCode);
 					}
 				}

src/Essentials/src/Preferences/Preferences.uwp.cs

@@ -100,9 +100,8 @@ public T Get<T>(string key, T defaultValue, string sharedName)
 			lock (locker)
 			{
 				var appDataContainer = GetApplicationDataContainer(sharedName);
-				if (appDataContainer.Values.ContainsKey(key))
+				if (appDataContainer.Values.TryGetValue(key, out var tempValue))
 				{
-					var tempValue = appDataContainer.Values[key];
 					if (tempValue != null)
 					{
 						if (defaultValue is DateTime dt)

src/TestUtils/src/DeviceTests/xUnitCustomizations.cs

@@ -138,13 +138,13 @@ string GetCategoryPrefix()
 		{
 			if (_categoryPrefix == null)
 			{
-				if (!Traits.ContainsKey(CategoryDiscoverer.Category))
+				if (!Traits.TryGetValue(CategoryDiscoverer.Category, out List<string>? categoryTraits))
 				{
 					_categoryPrefix = string.Empty;
 				}
 				else
 				{
-					_categoryPrefix = $"[{string.Join(", ", Traits[CategoryDiscoverer.Category])}] ";
+					_categoryPrefix = $"[{string.Join(", ", categoryTraits)}] ";
 				}
 			}