[Xaml] don't use context before checking it's not null (#5124)

diff --git a/Xamarin.Forms.Xaml/XamlServiceProvider.cs b/Xamarin.Forms.Xaml/XamlServiceProvider.cs
index 96d9919..127d76d 100644 (file)
--- a/Xamarin.Forms.Xaml/XamlServiceProvider.cs
+++ b/Xamarin.Forms.Xaml/XamlServiceProvider.cs
@@ -13,12 +13,11 @@ namespace Xamarin.Forms.Xaml.Internals
 
                internal XamlServiceProvider(INode node, HydrationContext context)
                {
-                       object targetObject;
-                       if (node != null && node.Parent != null && context.Values.TryGetValue(node.Parent, out targetObject))
+                       if (context != null && node != null && node.Parent != null && context.Values.TryGetValue(node.Parent, out object targetObject))
                                IProvideValueTarget = new XamlValueTargetProvider(targetObject, node, context, null);
                        if (context != null)
                                IRootObjectProvider = new XamlRootObjectProvider(context.RootElement);
-                       if (node != null)
+                       if (context != null && node != null)
                        {
                                IXamlTypeResolver = new XamlTypeResolver(node.NamespaceResolver, XamlParser.GetElementType,
                                        context.RootElement.GetType().GetTypeInfo().Assembly);
@@ -26,8 +25,7 @@ namespace Xamarin.Forms.Xaml.Internals
                                Add(typeof(IReferenceProvider), new ReferenceProvider(node));
                        }
 
-                       var xmlLineInfo = node as IXmlLineInfo;
-                       if (xmlLineInfo != null)
+                       if (node is IXmlLineInfo xmlLineInfo)
                                IXmlLineInfoProvider = new XmlLineInfoProvider(xmlLineInfo);
 
                        IValueConverterProvider = new ValueConverterProvider();