.

src/Avalonia.Build.Tasks/ComInteropHelper.cs

@@ -65,10 +65,8 @@ namespace Avalonia.Build.Tasks
                 {
                     Instruction instruction = instructions[i];
 
-                    if (instruction.OpCode == OpCodes.Call && instruction.Operand is MethodReference)
+                    if (instruction.OpCode == OpCodes.Call && instruction.Operand is MethodReference methodDescription)
                     {
-                        var methodDescription = (MethodReference)instruction.Operand;
-
                         if (methodDescription.Name.StartsWith("Calli") && methodDescription.DeclaringType.Name == "LocalInterop")
                         {
                             var callSite = new CallSite(methodDescription.ReturnType) { CallingConvention = MethodCallingConvention.StdCall };

src/Avalonia.Controls/PullToRefresh/ScrollViewerIRefreshInfoProviderAdapter.cs

@@ -197,12 +197,12 @@ namespace Avalonia.Controls.PullToRefresh
                 throw new ArgumentException(nameof(_scrollViewer), "Adaptee's content property must be a Visual");
             }
 
-            if (content.Parent is not InputElement)
+            if (content.Parent is not InputElement parent)
             {
                 throw new ArgumentException(nameof(_scrollViewer), "Adaptee's content parent must be an InputElement");
             }
 
-            MakeInteractionSource(content.Parent as InputElement);
+            MakeInteractionSource(parent);
 
             if (_scrollViewer != null)
             {

src/Avalonia.Controls/Templates/FuncTreeDataTemplate`1.cs

@@ -59,7 +59,7 @@ namespace Avalonia.Controls.Templates
         /// <returns>The untyped function.</returns>
         private static Func<object?, bool> CastMatch(Func<T, bool> f)
         {
-            return o => (o is T) && f((T)o);
+            return o => o is T arg && f(arg);
         }
 
         /// <summary>
@@ -72,7 +72,7 @@ namespace Avalonia.Controls.Templates
         {
             return (o, s) => f((T)o!, s);
         }
-        
+
         /// <summary>
         /// Casts a function with a typed parameter to an untyped function.
         /// </summary>

src/Avalonia.Diagnostics/Diagnostics/ViewModels/ControlDetailsViewModel.cs

@@ -33,12 +33,12 @@ namespace Avalonia.Diagnostics.ViewModels
         {
             _avaloniaObject = avaloniaObject;
 
-            TreePage = treePage;            
-                        Layout =  avaloniaObject is Visual 
-                ?  new ControlLayoutViewModel((Visual)avaloniaObject)
+            TreePage = treePage;
+                        Layout =  avaloniaObject is Visual visual 
+                ?  new ControlLayoutViewModel(visual)
                 : default;
 
-            NavigateToProperty(_avaloniaObject, (_avaloniaObject as Control)?.Name ?? _avaloniaObject.ToString()); 
+            NavigateToProperty(_avaloniaObject, (_avaloniaObject as Control)?.Name ?? _avaloniaObject.ToString());
 
             AppliedStyles = new ObservableCollection<StyleViewModel>();
             PseudoClasses = new ObservableCollection<PseudoClassViewModel>();

src/Markup/Avalonia.Markup/Markup/Parsers/SelectorGrammar.cs

@@ -552,7 +552,8 @@ namespace Avalonia.Markup.Parsers
 
             public override bool Equals(object? obj)
             {
-                return obj is ClassSyntax && ((ClassSyntax)obj).Class == Class;
+                return obj is ClassSyntax syntax &&
+                       syntax.Class == Class;
             }
         }
 
@@ -562,7 +563,8 @@ namespace Avalonia.Markup.Parsers
 
             public override bool Equals(object? obj)
             {
-                return obj is NameSyntax && ((NameSyntax)obj).Name == Name;
+                return obj is NameSyntax syntax &&
+                       syntax.Name == Name;
             }
         }
 
@@ -574,9 +576,9 @@ namespace Avalonia.Markup.Parsers
 
             public override bool Equals(object? obj)
             {
-                return obj is PropertySyntax && 
-                    ((PropertySyntax)obj).Property == Property && 
-                    ((PropertySyntax)obj).Value == Value;
+                return obj is PropertySyntax syntax &&
+                       syntax.Property == Property &&
+                       syntax.Value == Value;
             }
         }
 

src/Windows/Avalonia.Win32.Interop/Wpf/IntSize.cs

@@ -28,7 +28,7 @@ namespace Avalonia.Win32.Interop.Wpf
         public override bool Equals(object obj)
         {
             if (ReferenceEquals(null, obj)) return false;
-            return obj is IntSize && Equals((IntSize) obj);
+            return obj is IntSize size && Equals(size);
         }
 
         public override int GetHashCode()

src/Windows/Avalonia.Win32/WindowImpl.CustomCaptionProc.cs

@@ -109,7 +109,7 @@ namespace Avalonia.Win32
 
                             if (_owner is Window window)
                             {
-                                var visual = window.Renderer.HitTestFirst(position, (Visual)_owner, x =>
+                                var visual = window.Renderer.HitTestFirst(position, window, x =>
                                 {
                                     if (x is IInputElement ie && (!ie.IsHitTestVisible || !ie.IsEffectivelyVisible))
                                     {