diff --git a/src/Shared/HandyControlDemo_Shared/ViewModel/Basic/ChatBoxViewModel.cs b/src/Shared/HandyControlDemo_Shared/ViewModel/Basic/ChatBoxViewModel.cs
index cd14d41e..9b03c782 100644
--- a/src/Shared/HandyControlDemo_Shared/ViewModel/Basic/ChatBoxViewModel.cs
+++ b/src/Shared/HandyControlDemo_Shared/ViewModel/Basic/ChatBoxViewModel.cs
@@ -76,7 +76,7 @@ namespace HandyControlDemo.ViewModel
 
         private void ReadMessage(RoutedEventArgs e)
         {
-            if (e.OriginalSource is FrameworkElement {Tag: ChatInfoModel info})
+            if (e.OriginalSource is FrameworkElement { Tag: ChatInfoModel info })
             {
                 if (info.Type == ChatMessageType.Image)
                 {