From 91c6323be6e6ba357a849f1cdad1ada1e7fcfcb6 Mon Sep 17 00:00:00 2001
From: ema <mccoy39082@163.com>
Date: Tue, 16 Dec 2025 19:14:42 +0800
Subject: [PATCH] Refactor null check in OnSpinPropertyChanged

Replaces explicit null check and cast with pattern matching for improved readability and conciseness.
---
 QuickLook/Controls/BusyDecorator/SpinIcon.cs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/QuickLook/Controls/BusyDecorator/SpinIcon.cs b/QuickLook/Controls/BusyDecorator/SpinIcon.cs
index cea93be..c682146 100644
--- a/QuickLook/Controls/BusyDecorator/SpinIcon.cs
+++ b/QuickLook/Controls/BusyDecorator/SpinIcon.cs
@@ -33,9 +33,7 @@ internal class SpinIcon : TextBlock, ISpinable
 
     private static void OnSpinPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
     {
-        var b = d as SpinIcon;
-
-        if (b == null) return;
+        if (d is not SpinIcon b) return;
 
         if ((bool)e.NewValue)
             b.BeginSpin();